SVPL1209SG VPT | Alldatasheet
Document overview
- Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
- PDF pages: 17
Technical content
Sales Information Phone:(425) 353-3010 Fax: (425) 353-4030 SVPL1209SG – 2.0 E-mail: vptsales@vptpower.com Web: www.vptpower.com Page 1 SVPL1209SG SERIES SPACE QUALIFIED POINT OF LOAD CONVERTERS Products and reports described in this datasheet are subject to all export license restrictions and regulations which may include but are not limited to ITAR (International Traffic in Arms Regulations) and the Export Administration and Foreign Assets Control Regulations. Further restrictions may apply. Contact VPT sales for details. VPT, its logo and tagline are registered trademarks in the U.S. Patent and Trademark Office. All other names, product names and trade names may be trademarks or registered trademarks of their respective holders. SVPL Series DC-DC Converter Models Available Input: 3.1 V to 13.2 V
9 A output
Qualified to MIL-PRF-38534 Class H and Class K
1.0 DESCRIPTION
The SVPL Series of space qualified point-of-load DC-DC converters is specifically designed for the harsh radiation environment of space applications. Performance is guaranteed through the use of hardened semiconductor components and analysis. The SVPL Series has been characterized for Total Ionizing Dose (TID) performance including Enhanced Low Dose Rate Sensitivity (ELDRS) and for Single Event Effects (SEE) per VPT’s DLA-approved Radiation Hardness Assurance (RHA) plan per MIL-PRF-38534, Appendix G, Level R. The SVPL1209SG is based on the Intersil ISL70003ASEH radiation-hardened monolithic buck regulator. It is designed to operate from nominal bus voltages from 3.3 V to 12 V. The SVPL1209SG supplies low voltages at 9 A with high efficiency and fast transient response, making it an ideal choice to supply point-of-load applications such as high performance space processors.
1.1 FEATURES
- Operates from 3.1 – 13.2 V input
- Adjustable Output from 0.8 – 5 V
- Up to 9 Amps Output
- High Efficiency, up to 93%
- High Power Density, up to 132 W/in3
- Output Enable Control
- Low Output Noise
- Over Current Protection
- Synchronizable to an external clock
1.2 SPACE LEVEL CHARACTERIZATIONS
- Total Ionizing Dose Performance
- High Dose Rate [50-300 rad(Si)/s] ≥ 100 krad(Si)
- Low Dose Rate [<10 mrad(Si)/s] ≥ 100 krad(Si)
- Single Event Effects Performance
- SEL, SEB, and SEGR LETTH ≥ 85 MeV-cm2/mg
- SEFI Threshold LETTH ≥ 42 MeV-cm2/mg
- SEFI X-section (LETEFF = 85 MeV-cm2/mg) ≤ 1.18x10-7 cm2
- SET fully characterized for cross section and magnitude
- Operation from -55 °C to +125 °C
- Worst-case analysis, stress, radiation, reliability reports available
1.3 MANUFACTURING AND COMPLIANCE
- Qualified to MIL-PRF-38534 Class H and Class K, DLA SMD # 5962-17232
- MIL-PRF-38534 element evaluated components
- Manufactured in a MIL-PRF-38534 Class H and Class K facility
- MIL-STD-883
- ISO-9001
1.4 PACKAGING
- Low-profile: 1.110” x 1.110” x 0.276”
- Max weight: 22 g
- Precision seam-welded hermetic metal case
- Standard gullwing or optional straight-lead versions available
1.5 SIMILAR PRODUCTS AND ACCESSORIES
- SVPL3R306SG 6 A space qualified point of load DC-DC converter
- SVPL3R312SG 12 A space qualified point of load DC-DC converter
- SVGA0510SG 10 A space qualified point of load DC-DC converter
- SVGA0515SG 15 A space qualified point of load DC-DC converter
- Custom versions available
- Space qualified isolated DC-DC converters, 6 - 100 W
Sales Information Phone:(425) 353-3010 Fax: (425) 353-4030 SVPL1209SG - 2.0 E-mail: vptsales@vptpower.com Web: www.vptpower.com Page 2 SVPL1209SG Series
2.0 DIAGRAMS
2.1 BLOCK DIAGRAM
2.2 CONNECTION DIAGRAMS
- Rtrim should be connected directly across pins 11 and 12 as close as possible to the SVPL. 2. AGND should be connected to GND close to the SVPL. Voltage difference between the AGND and the GND pins greater than 0.3 V may result in regulation error and/or damage to the SVPL. 4. If not synchronizing converters, connect pin 9 to GND. 5. If not using PGOOD, leave pin 10 open. 6. Rcomp and Ccomp are optional components that can be used to optimize the SVPL transient response.
3.0 SPECIFICATIONS
3.1 ABSOLUTE MAXIMUM RATINGS
VIN, PGOOD1: -0.3 V to 16 V Operating Temperature (Full Load): -55 °C to +125 °C EN, UVLO, SYNC2: -0.3 V to 5.15 V or to VIN + 0.3 V Storage Temperature: -65 °C to +150 °C AGND: -0.3 V to 0.3 V Lead Solder Temperature (10 seconds): 270 °C ESD Rating per MIL-PRF-38534: 1 B Solder Reflow Temperature (30 seconds): 220 °C 1. VIN and PGOOD limited to 13.7 V for operation in a heavy ion environment at LET ≥ 85 MeV-cm2/mg and Tcase = 125 °C. Derate VIN ≤ 12.5 V to comply with MIL-HDBK-1547. resistor.
Sales Information Phone:(425) 353-3010 Fax: (425) 353-4030 SVPL1209SG - 2.0 E-mail: vptsales@vptpower.com Web: www.vptpower.com Page 3 SVPL1209SG Series
3.2 PERFORMANCE SPECIFICATIONS1
Tcase = -55 °C to +125 °C, Vin = 3.3 V ± 1% or 5 V ± 1% or 12 V ± 1%, Full Load, Unless Otherwise Specified SVPL1209SG Parameter Conditions Min Typ Max Units INPUT Voltage2 3.1 - 13.2 V Current EN = GND, Vin = 3.3 V - 1.3 7 mA EN = GND, Vin = 5 V - 2 7 mA EN = GND, Vin = 12 V - 4 7 mA Vin = 3.3 V, No Load - 40 60 mA Vin = 5 V, No Load - 50 75 mA Vin = 12 V, No Load - 90 125 mA Undervoltage Lockout2 UVLO Reference Voltage 0.55 0.6 0.65 V UVLO Sink Current 8.9 12 15.1 µA OUTPUT STATIC Voltage Tcase = 25 °C -1.0 - +1.0 %Vout Tcase = -55 °C to +125 °C -1.5 - +1.5 %Vout Power3 0 - 45 W Current4 Tcase = -55 °C to +95 °C 0 - 9 A Tcase = +125 °C 0 - 6 Ripple Voltage Vin = 3.3 V, Vout = 1.8 V,
20 Hz to 10 MHz - 30 60 mVpp
Vin = 5 V, Vout = 3.3 V,
20 Hz to 10 MHz - 35 60 mVpp
Vin = 12 V, Vout = 5 V,
20 Hz to 10 MHz - 85 120 mVpp
Load Regulation -0.6 0.03 +0.6 %Vout Load Fault Dissipation Vin = 12 V, Vout = 5 V - - 6 W OUTPUT DYNAMIC Load Step, Half to Full Load, Vin = 5 V, Output Transient - 75 140 mV Vout = 3.3 V Recovery5 - 150 300 µs Turn-On (Vin = 0 to 3.3 V or 5 V or 12 V, EN = Vin) Delay - 6 10 ms Overshoot - 0 15 mVpk FUNCTION Enable (EN)2 EN Input High Voltage 2.1 - - V EN Input Low Voltage - - 0.7 V SYNC Frequency Range2 420 - 580 kHz GENERAL Efficiency Vin = 5 V, Vout = 3.3 V 81 87 - % Capacitive Load2 Vout ≤ 1.2 V - - 5000 µF Vout ≥ 1.2 V - - 6000 Vout Switching Frequency 425 500 575 kHz Weight Standard package option - - 22 g MTBF (MIL-HDBK-217F) SF @ Tcase = 55 °C - 5.77 - MHr POST-RAD END-OF-LIFE LIMITS6 OUTPUT Voltage Tcase = -55 °C to +125 °C -3.0 - +3.0 %Vout Switching Frequency 420 - 580 kHz 1. Performance specifications are guaranteed with 100 µF from VIN to GND. 2. Verified by qualification testing. 3. Dependent on output voltage. 4. Output current is rated to 9 A for Tcase ≤ 95 °C. From 95 °C to 125 °C, derate linearly from 9 A to 6 A. 5. Time for output voltage to settle within 1% of steady-state value. 6. End-of-Life performance includes aging and radiation degradation and is within standard limits except where noted.
Sales Information Phone:(425) 353-3010 Fax: (425) 353-4030 SVPL1209SG - 2.0 E-mail: vptsales@vptpower.com Web: www.vptpower.com Page 4 SVPL1209SG Series
4.0 PERFORMANCE CURVES
4.1.1 SVPL1209SG Efficiency (Typical, 25 °C, Vin = 3.3 V)
4.1.2 SVPL1209SG Efficiency (Typical, 25 °C, Vin = 5 V)
Sales Information Phone:(425) 353-3010 Fax: (425) 353-4030 SVPL1209SG - 2.0 E-mail: vptsales@vptpower.com Web: www.vptpower.com Page 5 SVPL1209SG Series
4.0 PERFORMANCE CURVES (CONTINUED)
4.1.1 SVPL1209SG Efficiency (Typical, 25 °C, Vin = 12 V)
Sales Information Phone:(425) 353-3010 Fax: (425) 353-4030 SVPL1209SG - 2.0 E-mail: vptsales@vptpower.com Web: www.vptpower.com Page 6 SVPL1209SG Series
5.0 MECHANICAL OUTLINES AND PINOUT
Standard Gullwing Package Option: 1. Tolerances are +0.005” unless otherwise stated 2. Case temperature is measured on the center of the baseplate surface 3. Materials: Case (Steel, gold over nickel plated); Cover (Steel, nickel plated); Pin (Copper-cored alloy 52, gold over nickel plated, 63/37 SnPb solder dipped); Pin Seals (Glass) Pin Function Pin Function Pin Function Pin Function
1 VIN 6 GND 11 AGND 16 GND
2 VIN 7 EN 12 TRIM 17 VOUT
3 VIN 8 UVLO 13 +SENSE 18 VOUT
4 GND 9 SYNC 14 GND 19 VOUT
5 GND 10 PGOOD 15 GND 20 VOUT
Sales Information Phone:(425) 353-3010 Fax: (425) 353-4030 SVPL1209SG - 2.0 E-mail: vptsales@vptpower.com Web: www.vptpower.com Page 7 SVPL1209SG Series
5.0 MECHANICAL OUTLINES AND PINOUT (CONTINUED)
Optional Straight-Lead Package: 1. Tolerances are +0.005” unless otherwise stated 2. Case temperature is measured on the center of the baseplate surface 3. Materials: Case (Steel, gold over nickel plated); Cover (Steel, nickel plated); Pin (Copper-cored alloy 52, gold over nickel plated); Pin Seals (Glass) 4. Pins may have exposed nickel plating (not base metal) beyond the ceramic tie bars due to the plating process. No nickel plating is exposed between the tie bar and case. Pin Function Pin Function Pin Function Pin Function
Sales Information Phone:(425) 353-3010 Fax: (425) 353-4030 SVPL1209SG - 2.0 E-mail: vptsales@vptpower.com Web: www.vptpower.com Page 8 SVPL1209SG Series
6.0 TECHNICAL NOTES
Please note that many of these functions are also demonstrated in detail on the VPT website in the form of technical video labs.
6.1 GENERAL INFORMATION
6.1.1 Topology Description
The SVPL1209SG is a non-isolated, fixed-frequency, radiation-hardened, synchronous buck converter based on the Intersil ISL70003ASEH. It is optimized for low voltage point-of-load (POL) applications. The SVPL1209SG operates from a 3.1 to 13.2 V input and provides a stepped-down, precisely regulated, programmable output voltage at high efficiency.
6.1.2 Source Impedance
The impedance of the input source can interact with the POL converter and impact performance. High source impedance is often caused by a long input cable or other components added in series with the input. In some cases, additional input capacitance will be needed to stabilize the system.
6.1.3 Case Connection
The SVPL1209SG case is connected to GND at a single point inside of the package.
6.2 FUNCTION DESCRIPTIONS
6.2.1 Enable (EN)
The EN pin accepts TTL/CMOS logic input as described in the Performance Specifications table. When EN is pulled low, the converter is disabled and the supply current drops to typical values between 1.3 – 4 mA, depending on the input voltage. The internal power MOSFETs will be turned off, and the SVPL1209SG power stage will be in a high-impedance state. When the EN pin voltage exceeds its logic rising threshold, the SVPL1209SG monitors the UVLO pin voltage before initiating soft-start. The EN pin should not be driven ON/OFF capability is not required and Vin ≤ 5.15 V, EN can be connected directly to Vin. If Vin > 5.15 V, EN can be pulled up toward Vin through a 49.9 kΩ – 100 kΩ current limiting resistor.
6.2.3 Power Good (PGOOD)
PGOOD is an open-drain output. It is pulled to GND when the output voltage is outside a ±11% regulation window. When the output voltage is within ±11% of its set point, PGOOD will be released and can be pulled up through a resistor to any voltage from 0 V to 13.2 V. The external pull-up resistor should have a nominal value in the range of 1 kΩ to 10 kΩ. PGOOD should be bypassed to GND with a 10nF ceramic capacitor to mitigate SEE.
6.2.2 Synchronization (SYNC)
The SVPL1209SG can be synchronized to an external clock with a frequency range of 500 kHz ±15%. During start-up, the converter will use its internal oscillator. Once soft-start is complete and PGOOD is released, the converter will synchronize to the external clock signal. This allows the SVPL1209SG to be the power source to the external clock components without the requirement that a clock signal be present at the SYNC pin before start-up. The clock signal’s low level must be less than 0.7 V and its high level must be between 2.1 V and 5.15 V to guarantee proper synchronization. The clock signal’s duty cycle should be between 40 to 60%. If not synchronizing converters, connect SYNC to GND.
Sales Information Phone:(425) 353-3010 Fax: (425) 353-4030 SVPL1209SG - 2.0 E-mail: vptsales@vptpower.com Web: www.vptpower.com Page 9 SVPL1209SG Series
6.2.4 Adjusting the Output Voltage (TRIM)
The output voltage of the converter is set with an external trim resistor connected from the TRIM pin to the AGND pin. Use the equations or table below to choose the trim resistor value. Trim resistor tolerance of 0.1% is recommended to achieve an accurate output voltage. The default output voltage with the TRIM pin left open is 0.8 V.
6.2.5 Output Capacitors
Output capacitors for point-of-load (POL) DC/DC converters should be chosen to meet output voltage ripple and transient requirements. Meeting the transient response requirement is accomplished by making the output impedance of the converter sufficiently small. Given the high control bandwidth of POL converters like the SVPL series, the peak output impedance is typically dominated by the equivalent series resistance (ESR) of the bulk output capacitance. Therefore, the output capacitors should be chosen to set a certain maximum total ESR. The total ESR is the parallel combination of the internal bulk capacitor’s ESR and that of the added capacitors. Given the output voltage transient requirement, maximum load step, and the ESR of each bulk capacitor that will be added, the number of added capacitors needed is calculated with the following equations: 𝐸𝑆𝑅𝑇𝑂𝑇𝐴𝐿 = ∆𝑉𝑂𝑈𝑇 ∆𝐼𝑂𝑈𝑇 𝐸𝑆𝑅𝐴𝐷𝐷𝐸𝐷 = 𝐸𝑆𝑅𝑇𝑂𝑇𝐴𝐿 ∗ 𝐸𝑆𝑅𝐼𝑁𝑇𝐸𝑅𝑁𝐴𝐿 𝐸𝑆𝑅𝐼𝑁𝑇𝐸𝑅𝑁𝐴𝐿 − 𝐸𝑆𝑅𝑇𝑂𝑇𝐴𝐿 𝑁 = 𝐸𝑆𝑅𝐸𝐴𝐶𝐻 𝐸𝑆𝑅𝐴𝐷𝐷𝐸𝐷 Make sure that the added capacitance does not violate the maximum allowed output capacitance using the following equation: 𝐶𝑂𝑈𝑇−𝑀𝐴𝑋 = 6000µ𝐹 𝑉𝑂𝑈𝑇 For example, assume that VOUT is 1.5 V, the maximum output transient allowed is 37.5mV, and the load step is 4.5 A. Assume the output capacitors being used are 330 µF and have a maximum ESR of 50 mΩ each. 𝐸𝑆𝑅𝑇𝑂𝑇𝐴𝐿 = ∆𝑉𝑂𝑈𝑇 ∆𝐼𝑂𝑈𝑇 = 37.5𝑚𝑉 4.5𝐴 = 8.33𝑚𝛺 SVPL1209SG +Vout (V) Rtrim (Ω)
0.8 Open
0.9 58.6k 1.0 28.6k 1.2 13.6k 1.5 7.17k 1.8 4.60k 2.0 3.60k 2.5 2.13k 2.8 1.60k 3.0 1.33k 3.3 1.00k 4.0 475 5.0 28.6 Parameter Definition ΔVOUT Max VOUT transient allowed ΔIOUT Max load current step ESRTOTAL Total combined parallel ESR, including internal and added capacitors ESRADDED Combined parallel ESR of the added capacitors ESRINTERNAL ESR of the internal bulk capacitor (43.7mΩ max under worst-case conditions) ESREACH ESR of each of the added capacitors N Number of added capacitors 𝑅𝑇𝑅𝐼𝑀 = 6000 𝑉𝑂𝑈𝑇 − 0.8 − 1400 𝑉𝑂𝑈𝑇 = 6000 𝑅𝑇𝑅𝐼𝑀 + 1400 + 0.8
Sales Information Phone:(425) 353-3010 Fax: (425) 353-4030 SVPL1209SG - 2.0 E-mail: vptsales@vptpower.com Web: www.vptpower.com Page 10 SVPL1209SG Series 𝐸𝑆𝑅𝐴𝐷𝐷𝐸𝐷 = 𝐸𝑆𝑅𝑇𝑂𝑇𝐴𝐿 ∗ 𝐸𝑆𝑅𝐼𝑁𝑇𝐸𝑅𝑁𝐴𝐿 𝐸𝑆𝑅𝐼𝑁𝑇𝐸𝑅𝑁𝐴𝐿 − 𝐸𝑆𝑅𝑇𝑂𝑇𝐴𝐿 = 8.33𝑚𝛺 ∗ 43.7𝑚𝛺 43.7𝑚𝛺 − 8.33𝑚𝛺 = 10.30𝑚𝛺 𝑁 = 𝐸𝑆𝑅𝐸𝐴𝐶𝐻 𝐸𝑆𝑅𝐴𝐷𝐷𝐸𝐷 = 50𝑚𝛺 10.30𝑚𝛺 = 4.85 → 𝑢𝑠𝑒 5 𝑜𝑢𝑡𝑝𝑢𝑡 𝑐𝑎𝑝𝑎𝑐𝑖𝑡𝑜𝑟𝑠 𝐶𝑂𝑈𝑇−𝑀𝐴𝑋 = 6000µ𝐹 𝑉𝑂𝑈𝑇 = 6000µ𝐹 1.5 = 4000µ𝐹 In the example, 5x 330 µF/50 mΩ capacitors are needed. This is a total capacitance of 1650 µF, which is well below the 4000 µF maximum allowed. The output voltage ripple can be evaluated through simulation using the circuit below. This circuit incorporates worst-case conditions that include the effects of component tolerances, temperature extremes (-55 °C to 125 °C), radiation (100 krad), and aging (10 year mission). Note that the resistor shown in series with the inductor includes the resistance of the inductor and ISL70003A power FETs. The pulsed voltage source should have a peak voltage equal to the input voltage and the minimum switching frequency (420 kHz) to evaluate the worst-case ripple. The duty cycle should be adjusted to attain the correct output voltage.
6.2.6 Input Capacitors
A minimum input capacitance of 100 µF should be added between VIN and GND to maintain the input voltage during transient conditions. The SVPL1209SG has been designed with internal ceramic input capacitors to minimize the voltage stresses on its power MOSFETs. These ceramic capacitors also reduce the current stress in the user-added input capacitors. For 100 µF or greater capacitors, the RMS currents of the added capacitors will be determined primarily by their combined ESR. The curves below estimate the total RMS current in the added input capacitors for different VOUT/VIN ratios. Worst-case conditions for load current, internal capacitance, and switching frequency are used. To verify the capacitors will have sufficient margin, the RMS current ratings of the added capacitors can be compared to the appropriate curve. If the application VOUT/VIN ratio is between two curves, use the curve with higher RMS current to be conservative. If multiple capacitors are added, then the RMS current will divide between them. If the maximum application load current is less than the SVPL1209SG maximum of 9 A, then the RMS current will be reduced proportionally.
Sales Information Phone:(425) 353-3010 Fax: (425) 353-4030 SVPL1209SG - 2.0 E-mail: vptsales@vptpower.com Web: www.vptpower.com Page 11 SVPL1209SG Series For example, let us assume Vin = 5 V, Vout = 1.8 V, max Iout = 5 A, and maximum temperature = 85 °C. Also, assume the capacitor being considered is a 150 µF capacitor with an ESR of 30 mΩ at 85 °C and the worst-case minimum switching frequency of 420 kHz. Assume the capacitor’s RMS current rating is 2.7 A at 85 °C. First, determine the Vout/Vin ratio: 𝑉𝑜𝑢𝑡 𝑉𝑖𝑛 = 1.8𝑉 5𝑉 = 0.36 The ratio lies between the 0.3 and 0.4 curves. Use the Vout/Vin = 0.4 curve, as it has higher RMS current and gives a more conservative estimate. At 30 mΩ, the 0.4 curve indicates an RMS current of 2.65 A. The RMS current for this application is found as: 𝐼𝑅𝑀𝑆_𝐶𝐼𝑁 = 𝐼𝑅𝑀𝑆_𝐶𝑈𝑅𝑉𝐸 (𝐴𝑝𝑝𝑙𝑖𝑐𝑎𝑡𝑖𝑜𝑛 max 𝐼𝑜𝑢𝑡 𝑆𝑉𝑃𝐿 max 𝐼𝑜𝑢𝑡 ) = 2.65 (5𝐴 9𝐴) = 1.47𝐴 The RMS current in the added input capacitors is 1.47 A, which is 54% of the 2.7 A current rating. The power dissipated in the capacitor will be about 30% of its power rating (0.542 = 0.30).
6.3 PROTECTION FEATURES
6.3.1 Input Undervoltage Lockout
The SVPL1209SG Series provides input undervoltage lockout (UVLO) protection. For input voltages below the turn-on voltage, the converter will remain off. The internal power MOSFETs will be turned off, and the SVPL1209SG power stage will be in a high-impedance state. When the input voltage exceeds the turn-on voltage, the converter will soft-start. For input voltages above the UVLO turn-off voltage but below the operating range of the converter, the converter may reach its maximum duty cycle and the output may be out of regulation. The figure below demonstrates the UVLO circuit. Note that it is referenced to AGND.
Sales Information Phone:(425) 353-3010 Fax: (425) 353-4030 SVPL1209SG - 2.0 E-mail: vptsales@vptpower.com Web: www.vptpower.com Page 12 SVPL1209SG Series Initially, the input voltage (VIN) is below the turn-on threshold (VUVLO_ON) and the IUVLO current sink is active. IUVLO is only active when the voltage at the UVLO pin is less than the UVLO reference voltage, VR. As VIN rises, the UVLO turn-on threshold is calculated as: 𝑉𝑈𝑉𝐿𝑂_𝑂𝑁 = 𝑉𝑅 ∙ [1 + 𝑅1 ] + 𝐼𝑈𝑉𝐿𝑂 ∙ 𝑅1 After VIN reaches VUVLO_ON, IUVLO turns off. With the part enabled and IUVLO off, the converter will shut down if VIN falls below the UVLO turn-off threshold (VUVLO_OFF): 𝑉𝑈𝑉𝐿𝑂_𝑂𝐹𝐹 = 𝑉𝑅 ∙ [1 + 𝑅1 The undervoltage lockout circuit hysteresis is: 𝑉𝑈𝑉𝐿𝑂_𝐻𝑌𝑆 = 𝑉𝑈𝑉𝐿𝑂_𝑂𝑁 − 𝑉𝑈𝑉𝐿𝑂_𝑂𝐹𝐹 = 𝐼𝑈𝑉𝐿𝑂 ∙ 𝑅1 R1 and R2 are chosen to set the desired thresholds and hysteresis. Typical and extreme values of VR and IUVLO are provided in section 3.2. The UVLO pin should be bypassed to AGND with a 10nF capacitor to mitigate SEE.
6.3.2 Output Soft-Start
The SVPL1209SG Series utilizes an output soft-start function to ramp the output in a controlled manner, eliminating output voltage overshoot and limiting inrush current at turn on. A voltage mode soft-start ensures the output waveform remains consistent regardless of changes in the load current. The output rise time is approximately 4 ms. The soft-start function is active whether the module is turned on with an application of input voltage or from driving EN high. The turn-on delay time is specified from the application of input voltage (or application of EN) until the output reaches 90% of its final value.
6.3.3 Output Short Circuit Protection
The SVPL1209SG Series provides hiccup-mode output short-circuit protection. When a sustained high peak current is detected, the converter will shut down. After a delay, the converter will attempt a soft-start. This sequence will continue until the fault is removed, allowing the converter to soft-start and resume normal operation.
Sales Information Phone:(425) 353-3010 Fax: (425) 353-4030 SVPL1209SG - 2.0 E-mail: vptsales@vptpower.com Web: www.vptpower.com Page 13 SVPL1209SG Series
6.4 THERMAL CONSIDERATIONS
The SVPL1209SG output current rating versus case temperature is illustrated in the figure below. It is rated at 9 A for case temperatures up to 95 °C. From 95 °C to 125 °C, derate linearly from 9 A to 6 A. From 125 °C to 135 °C, derate linearly to 0 A. The case temperature of the converter is specified on the baseplate of the converter. The converter is designed to be conduction-cooled, with the baseplate mounted to a heat sink, chassis, PCB, or other thermal surface. The internal power-dissipating components are mounted to the baseplate of the converter and all heat flow is through the baseplate. The lid of the converter does not provide a good thermal path. The maximum temperature rise from junction to case is 20 °C at 9 A output and 15 °C at 6 A output.
Sales Information Phone:(425) 353-3010 Fax: (425) 353-4030 SVPL1209SG - 2.0 E-mail: vptsales@vptpower.com Web: www.vptpower.com Page 14 SVPL1209SG Series
6.5 VPT RHA PLAN AND APPROACH
VPT takes a conservative approach to radiation testing to ensure product performance during space travel. VPT’s DLA approved Radiation Hardness Assurance (RHA) plan documents VPT’s processes and procedures for guaranteeing the performance of VPT products under various environmental conditions in space, including TID, SEE, and ELDRS. Documents Available Details DLA approved Radiation Hardness Assurance (RHA) Plan Summary The radiation environments covered by this overview include: total ionizing dose (TID), which includes enhanced low dose rate sensitivity (ELDRS); displacement damage (DD); and single event effects (SEE). Worst-Case Analysis Report Detailed worst-case analysis guarantees circuit performance post radiation and end of life. Stress Report Individual component stress analysis and deratings are included as part of the WCA report. Radiation Test Summary Report An overview report on the component level RLAT and characterization testing for TID and DD as well as the hybrid level characterizations for TID and SEE response. Reliability Report MTBF report based on MIL-HDBK-217 reliability calculations. Thermal Analysis Report Component temperature rise analysis and measurement results. Test Definition VPT’s Approach Total Ionizing Dose (TID). A measure of the energy absorbed in the semiconductor components from the naturally occurring sources of radiation (protons, electrons, photons). This results in the slow degradation of semiconductor performance specifications. TID is tested by exposing components to gamma radiation from a Cobalt-60 source. Designed for 100 krad(Si). Sensitive semiconductor components undergo RLAT to 100 krad(Si) per MIL-STD-883 Method 1019. Converters are characterized to 100 krad(Si). Enhanced Low Dose Rate Sensitivity (ELDRS): Many linear-bipolar integrated circuits show enhanced parameter degradation when exposed at low dose rates close to those seen in a space environment as compared to the high dose rates (50-300 rad(Si)/s) that components were traditionally tested at for TID degradation. MIL-STD-883 Method 1019 gives guidance for characterizing components for ELDRS. Components that exhibit ELDRS are tested for TID at a rate below 0.01 rad(Si)/s. All bipolar linear ICs are verified to be ELDRS free in accordance with MIL-STD-883 test method 1019 section 3.13 Single Event Effects (SEE). Single high energy protons and heavy ions can deposit sufficient energy in a semiconductor component, causing a range of effects. SEEs include single event latchups (SELs), single event gate ruptures (SEGRs), single event transients (SETs), single event functional interrupts (SEFIs) and single event burnouts (SEBs). Converters are characterized for catastrophic events (SEL, SEB, SEGR) as well as functional interrupts (SEFI) under heavy ion exposure to LET = 85 MeV-cm2/mg. Converters are also characterized for cross section and magnitude of output transients (SET) for at least 3 different LET levels. Displacement Damage (DD) is caused by protons and neutrons. Particles displace atoms in the bulk silicon crystal structure. DD leads to a darkening of optics and gradual degradation of performance. DD is tested at the component level with a neutron source. Optoisolators are not used. The sensitive semiconductor component is characterized by the manufacturer for DD performance to 1x1012 n/cm2. Radiation Lot Acceptance Testing (RLAT): Semiconductor wafer lots are exposed to TID or neutron radiation on a sample basis. If the parameter degradation for the tested samples is within the predetermined acceptance limits, then the lot can be used in radiation hardened converters. Sensitive semiconductor component undergoes RLAT for TID.
Sales Information Phone:(425) 353-3010 Fax: (425) 353-4030 SVPL1209SG - 2.0 E-mail: vptsales@vptpower.com Web: www.vptpower.com Page 15 SVPL1209SG Series
7.0 ENVIRONMENTAL SCREENING
100% tested per MIL-STD-883 as referenced to MIL-PRF-38534. Contact sales for more information concerning additional environmental screening and testing options. VPT Inc. reserves the right to ship higher screened or SMD products to meet orders for lower screening levels at our sole discretion unless specifically forbidden by customer contract. Test MIL-STD-883 Test Method, Condition /H+ (Class H + PIND) (Class K) /EM (Engineering Model) Non-QML1,6 Non-Destructive Bond Pull TM2023 ●2 ● ●2 Internal Visual TM2010, TM2017, TM2032 (MIL-STD-750, TM2072, TM2073)
- ● ● Temperature Cycling TM1010, Condition C -65 °C to 150 °C, Ambient ● ● Constant Acceleration TM2001, 3000g, Y1 Direction ● ● PIND3 TM2020, Condition A ●2 ● Pre Burn-In Electrical 25 °C ● Burn-In TM1015, 320 hrs., 125 °C, Case Typ ● TM1015, 160 hrs., 125 °C, Case Typ ● 24 hrs., 125 °C, Case Typ ● Final Electrical MIL-PRF-38534, Group A Subgroups 1-6
- ● MIL-PRF-38534, Group A Subgroups 1 and 4 25 °C Hermeticity (Seal) TM1014, Fine Leak, Condition A2 or B1 ● ● TM1014, Gross Leak, Condition C1 or B2 ● ● Gross Leak, Dip (1x10-3) ● Radiography5 TM2012 ● External Visual TM2009 ● ● ● 1. Non-QML products may not meet all requirements of MIL-PRF-38534 2. Not required per MIL-PRF-38534. Test performed for additional product quality assurance 3. PIND test Certificate of Compliance included in product shipment 4. 100% R&R testing with all test data included in product shipment 5. Radiographic test Certificate of Compliance and film(s) or data CD included in product shipment 6. Engineering models utilize only the screening specified and are not considered compliant for flight use
Sales Information Phone:(425) 353-3010 Fax: (425) 353-4030 SVPL1209SG - 2.0 E-mail: vptsales@vptpower.com Web: www.vptpower.com Page 16 SVPL1209SG Series
8.0 STANDARD MICROCIRCUIT DRAWING (SMD) NUMBERS
Do not use the SVPL1209SG Series similar part number for SMD product acquisition. It is listed for reference only. For exact specifications of the SMD product, refer to the SMD drawing. SMDs can be downloaded from the DLA Land and Maritime (Previously known as DSCC) website at https://landandmaritimeapps.dla.mil/programs/defaultapps.asp. The SMD numbers listed above represents the Federal Stock Class, Device Type, Device Class Designator, Case Outline, Lead Finish and RHA Designator (where applicable). Please reference the SMD for other screening levels, lead finishes, and radiation levels. All SMD products are marked with a “Q” on the cover as specified by the QML certification mark requirement of MIL-PRF-38534.
9.0 ORDERING INFORMATION
(1) Product Series (2) Nominal Input Voltage (3) Output Current (4) Number of Outputs (5) Package Option (6) Package Lead Option4 (7) Screening Code1,2,3 (8) Additional Screening Code4 SVPL 12 12 Volts 09
9 Amps
S Single G Gullwing None N Formed Straight /EM /H+ Engineering Model Class H + PIND Class K E Solder Dipped Contact Sales for additional options
1 Contact the VPT Sales Department for availability of Class H (/H) or Class K (/K) qualified products
2 VPT Inc. reserves the right to ship higher screened or SMD products to meet lower screened orders at our sole discretion unless specifically forbidden by customer contract 3 Engineering models utilize only the standard screening specified and are not considered compliant for flight use. These models are intended for low volume engineering characterization only and have no guarantee regarding operation in a radiation environment. The customer must place the following statement on each line item of their purchase order(s) for /EM units when ordering engineering models: “(Customer Name) acknowledges that the /EM unit listed in this line item is not permitted for flight use and will be used for Engineering characterization only.” 4 When selecting Package Lead Option “Formed”, Additional Screening Code “-E” (solder dipped leads) must also be applied. When selecting Package Lead Option “Straight”, Additional Screening Code “-E” should not be applied. Please contact your sales representative or the VPT Inc. Sales Department for more information concerning additional environmental screening and testing, different input voltage, output voltage, power requirements, source inspection, and/or special element evaluation for space or other higher quality applications.
Sales Information Phone:(425) 353-3010 Fax: (425) 353-4030 SVPL1209SG - 2.0 E-mail: vptsales@vptpower.com Web: www.vptpower.com Page 17 SVPL1209SG Series
10.0 CONTACT INFORMATION
To request a quotation or place orders please contact your sales representative or the VPT, Inc. Sales Department at: Phone: (425) 353-3010 Fax: (425) 353-4030 E-mail: vptsales@vptpower.com All information contained in this datasheet is believed to be accurate, however, no responsibility is assumed for possible errors or omissions. The products or specifications contained herein are subject to change without notice.
11.0 ADDITIONAL INFORMATION
Visit the VPT website for additional technical resources, including: Product Catalogs Application Notes and White Papers Technical Video Labs Additional Products For Avionics/Military, Hi-Rel COTS, and Space Applications