PT4500

PT4500 TI | Alldatasheet

Document overview

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Technical content

Features

• Input Voltage Range: 18V to 40V
• 20W Rated
• Output Voltages: 1.2V to 15V
• 82% Efficiency
• 1500 VDC Isolation
• Low Profile (8.5 mm)
• Adjustable Output Voltage PT4500 Series 20-W 24-V Input Isolated DC/DC Converter SL TS153B - JUNE 2000 - REVISED OCTOBER 2002

Ordering Information

PT4501/G72 = 3.3V/5A (16.5W) PT4502/G72 = 5.0V/4A PT4503/G72 = 12V/1.6A PT4504/G72 = 15V/1.3A PT4507/G72 = 1.8V/5A (9W) PT4508/G72 = 2.5V/5A (12.5W) PT4509/G72 = 1.2V/5A (6W) Pin-Out Information Pin Function

1 Remote On/Off *

2– V in 3– V in 4+ V in 5+ V in

6 Remote Sense (–)

7 –Vout 8 –Vout 9 +Vout 10 +Vout

11 Remote Sense (+)

12 V out Adjust *

• For further information, see application notes.

Description

The PT4500 Excalibur™ power modules are a series of isolated DC/DC converters housed a new space-saving copper case. The series includes a number of standard output voltages ranging from as low as 1.2VDC to 15VDC, each adjustable by up to 10% of nominal. The modules are ideal for Telecom, Industrial, Computer, and other distributed power applications that require input-to-output isolation. Using multiple modules, system designers can implement a complete custom power supply solution. The flexibility of f ull isolation also allows the input or output to be configured for negative voltage operation. The PT4500 series is electrically equivalent to the popular PT4140 series and requires no additional components for proper operation.

• On/Off Control
• Differential Remote Sense
• Short Circuit Protection
• Over Temperature Shutdown
• Space Saving Package: 1.0 sq. in. PCB Area (Suffix N)
• 4×106 Hrs MTBF PT4500 LOAD 4, 5 2, 3 9, 10 7, 8

612 Remote Sense (–)

Remote Sense (+) +V OUT –VOUT VO Adj +V IN –VIN Remote On/Off Q 1 BSS138 PT Series Suffix (PT1234x) Case/Pin Order Package Configuration Suffix Code Vertical N (ELJ) Horizontal A (ELK) SMD C (ELL) (Reference the applicable package code draw- ing for the dimensions and PC board layout)

For technical support and more information, see inside back cover or visit www.ti.com PT4500 Series 20-W 24-V Input Isolated DC/DC Converter Specifications (Unless otherwise stated, T a =25°C, Vin =24V, Cout =0µF, and Io =Iomax) PT4500 SERIES Characteristic Symbol Conditions Min Typ Max Units Output Current I o Over Vin range V o = 15V 0.1 (1) — 1.3 Input Voltage Range V in Over Io Range 18 24 40 VDC Set Point Voltage Tolerance V o tol — ±1 ±1.5 (2) %Vo Temperature Variation Reg temp –40° ≤Ta ≤ +85°C, Io =Iomin — ±0.5 — %V o Line Regulation Reg line Over Vin range — ±0.2 ±1 %V o Load Regulation Reg load Over Io range Vo ≥5.0V — ±0.4 ±1 (2) %Vo Vo ≤3.3V — ±13 ±33 mV Total Output Voltage Variation ∆Votot Includes set-point, line, load, —± 2± 3 (2) %Vo–40° ≤Ta ≤ +85°C Efficiency η Vo = 15V — 86 — Vo = 12V — 83 — Vo =5.0V — 82 — Vo =3.3V — 79 — % Vo =1.8V — 67 — Vo =1.5V — 65 — Vo =1.2V — 59 — Vo Ripple (pk-pk) V r 20MHz bandwidth V o ≥ 5.0V — 0.5 — %V o Vo ≤ 3.3V — 15 — mV pp Transient Response t tr 0.1A/µs load step, 50% to 100% Iomax — 100 — µs ∆Vtr Vo over/undershoot V o ≥ 5.0V — ±3 — %V o Vo ≤ 3.3V — ±150 — mV Current Limit Threshold I lim Vin =18V, ∆Vo = –1% — 200 — %I omax Output Voltage Adjust V o adj — ±10 — % Switching Frequencyƒ s Over Vin range V o ≥ 5.0V 600 650 700 kHzVo ≤ 3.3V 800 850 900 Under-Voltage Lockout UVLO — 16.5 — V Remote On/Off (Pin 1) Referenced to –Vin (pin 2) High-Level Input Voltage V IH 2.5 — Open (3) V Low-Level Input Voltage V IL –0.2 — 0.8 Low-Level Input Current I IL — –10 – µA Standby Input Current I in standbypins 1 & 2 connected — 7 10 mA Internal Input Capacitance C in — 0.5 — µF External Output Capacitance C out 0 — 220 (4) µF Isolation Voltage Input–output/input–case 1500 — — V Capacitance Input to output — 1100 — pF Resistance Input to output 10 — — M Ω Operating Temperature Range T a Over Vin range –40 — 85 (5) °C Solder Reflow Temperature T reflow Surface temperature of module pins or case — — 215 (6) °C Storage Temperature T s — –40 — 125 °C ReliabilityMTBF Per Bellcore TR-332 4 — — 10 6 Hrs50% stress, Ta =40°C, ground benign Mechanical Shock — Per Mil-Std-883D, method 2002.3, — 500 — G’s1mS, half-sine, mounted to a fixture Mechanical Vibration — Mil-Std-883D, Method 2007.2 Suffix N — 20 (7) — G’s20-2000Hz, soldered Suffix A, C — 20 (7) — Weight — — — 23 — grams Flammability— Materials meet UL 94V-0 Notes: (1)The DC/DC converter will operate at no load with reduced specifications. (2) For optimum voltage accuracy the ‘Remote Sense (+)’ and ‘Remote Sense (–)’ pins must be connected to +V out and –Vout respectively. (3)The Remote On/Off control (pin 1) has an internal pull-up. If pin 1 is left open the PT4500 will operate when input power is applied. A small low- leakage (<100nA) MOSFET must be used to control this input. The open-circuit voltage is less than 10V. See application notes fo r further information. (4)External output capacitance is not required for proper operation. Capacitamce may be added to improve the response to load t ransients. The maximum total capacitance (including the load circuit) must not exceed 220µF, and the combined ESR of must not be less than 100m Ω . (5)See Safe Operating Area curves or contact the factory for the appropriate derating. (6)During solder reflow of SMD package version do not elevate the module case, pins, or internal component temperatures above a peak of 215°C. For further guidance refer to the application note, “Reflow Soldering Requirements for Plug-in Power Surface Mount Products,” (SLTA 051). (7)The case pins on the through-hole package types (suffixes N & A) must be soldered. For more information see the applicable p ackage outline drawing. SL TS153B - JUNE 2000 - REVISED OCTOBER 2002

For technical support and more information, see inside back cover or visit www.ti.com Note A: Characteristic data has been developed from actual products tested at 25°C. This data is considered typical data for the Converter. Note B: SOA curves represent the conditions at which internal components are at or below the manufacturer’s maximum operating temperatures Efficiency vs Output Current Ripple vs Output Current Power Dissipation vs Output Current PT4501, 3.3 VDC (See Note A) Safe Operating Area, V in =24V (See Note B) Typical CharacteristicsPT4500 Series 20-W 24-V Input Isolated DC/DC Converter 0 0.4 0.8 1.2 1.6 Iout (A) Efficiency - % 18.0V 24.0V 30.0V 36.0V VIN 0 0.4 0.8 1.2 1.6 Iout (A) Ripple - mV 36.0V 30.0V 24.0V 18.0V VIN 0 0.4 0.8 1.2 1.6 Iout (A) Pd - Watts 18.0V 24.0V 30.0V 36.0V VIN 01234 Iout (A) Efficiency - % 18.0V 24.0V 30.0V 36.0V VIN 01234 Iout (A) Ripple - mV 36.0V 30.0V 24.0V 18.0V VIN 01234 Iout (A) Pd - Watts 36.0V 30.0V 24.0V 18.0V VIN 012345 Iout (A) Efficiency - % 18.0V 24.0V 30.0V 36.0V VIN 012345 Iout (A) Ripple - mV 36.0V 30.0V 24.0V 18.0V VIN 012345 Iout (A) Pd - Watts 36.0V 30.0V 24.0V 18.0V VIN Efficiency vs Output Current Ripple vs Output Current Power Dissipation vs Output Current PT4502, 5 VDC (See Note A) Efficiency vs Output Current Ripple vs Output Current Power Dissipation vs Output Current PT4503, 12 VDC (See Note A) 012345 Iout (A) Ambient Temperature (°C) 300LFM 200LFM 100LFM Nat conv Airflow Safe Operating Area, V in =24V (See Note B) Safe Operating Area, V in =24V (See Note B) 01234 Iout (A) Ambient Temperature (°C) 300LFM 200LFM 100LFM Nat conv Airflow SL TS153B - JUNE 2000 - REVISED OCTOBER 2002 Iout (A) Ambient Temperature (°C) 300LFM 200LFM 100LFM Nat conv Airflow

For technical support and more information, see inside back cover or visit www.ti.com Application Notes PT4500/PT4520 Series Operating Features and System Considerations for the PT4500/PT4520 DC/DC Converters Output Current Limit The PT4500 and PT4520 series of DC/DC converters incorporate an output current limit. This protects both the module and upstream source against load faults. Applying a load, in excess of the current limit threshold, will sim- ply cause the output voltage to drop. The output current remains limited, but continues to flow in the fault. The drop in output voltage will vary according to the severity of the fault. Applying a short circuit to the output will result in an output voltage of zero, and the fault current will be limited to a value slightly higher than the current limit threshold. Upon the removal of the load fault, the output voltage of the module will fully recover to its normal regulated output voltage. Primary-Secondary Isolation The PT4500 and PT4520 series of DC/DC converters incorporate electrical isolation between the input termi- nals (primary) and the output terminals (secondary). All converters are production tested to a withstand voltage of 1500VDC. The isolation complies with UL60950 and EN60950, and the requirements for operational isolation. This allows the converter to be configured for either a positive or negative input voltage source. Output Voltage Adjustment The output voltage is typcially adjustable over a range of ±10% of nominal. Consult the separate application note, “Ajusting the Output Voltage of the PT4500/PT4520 Series of Isolated DC/DC Converters.” Remote On/Off Function The output voltage from the converter can be turned off from the primary side using the Remote On/Off control (pin 1). Consult the separate application note, “Using the Remote On/Off Function on the PT4500/PT4520 Series of Isolated DC/DC Converters.” Under-Voltage Lock-Out The Under-Voltage Lock-Out (UVLO) circuit prevents operation of the converter whenever the input voltage to the module is insufficient to maintain output regulation. Below the UVLO threshold the module is off and the Remote On/Off control (pin 1) is inoperative. T able 1-2 gives the applicable UVLO thresholds. Table 1-2; UVLO Thresholds Series UVLO Threshold V in Range PT4520 31V Typical 36 – 75V PT4500 16.5V Typical 18 – 40V Turn-On Time The typical turn-on time is typically 35 milliseconds at V in =48V. This is from application of input power, or the removal of a low-voltage signal from the Remote On/Off (pin 1). This includes about about 5–10ms of delay time before the output voltage begins to rise. Turn-on time will vary slightly with input voltage, output load, and the total amount of capacitance connected to the output. Input Current Limiting The converter is not internally fused. For safety and overall system protection, the maximum input current to the converter must be limited. Active or passive current limiting can be used. Passive current limiting can be a fast acting fuse. A 125-V fuse, rated no more than 5A, is recommended. Active current limiting can be imple- mented with a current limited “Hot-Swap” controller. Thermal Considerations Airflow may be necessary to ensure that the module can supply the desired load current in environments with elevated ambient temperatures. The required airflow rate may be determined from the Safe Operating Area (SOA) thermal derating curves. These are provided in the “Typical Characteristics” section of the converter specifications.

For technical support and more information, see inside back cover or visit www.ti.com Adjusting the Output Voltage of the PT4500/ PT4520 Series of Isolated DC/DC Converters The factory pre-set output voltage of TI’s PT4500 and PT4520 series of isolated DC/DC converters may be adjusted within a nominal ±10% range. Adjustment is made from the secondary side of the regulator 1 with a single external resistor. For the input voltage range specified in the data sheet Table 2-1 gives the allowable adjustment range for each model, as V o (min) and Vo (max). Adjust Up: An increase in the output voltage is obtained by adding a resistor, R 2 between Vo Adjust (pin 12), and –Vout (pin 7, 8). Adjust Down: Add a resistor (R1), between Vo Adjust (pin 12), and +Vout (pin 9, 10). Refer to Figure 2-1 and Table 2-2 for both the placement and value of the required resistor, (R 1) or R2. Notes: 1. The PT4500 and PT4520 series of DC/DC converters incorporate isolation between the ±Vin and ±Vo terminals. Adjustment of the output voltage is made to the regulation circuit on the secondary or output side of the converter. 2. The maximum rated output power for this series is 20W. An increase in the output voltage may therefore require a corresponding reduction in the maximum output current ( see Table 2-1). The revised maximum output current must be determined as follows. Io(max) = 20 A, or 5A, whichever is less. Va Where Va is the adjusted ouput voltage. 3. Use only a single 1% resistor in either the (R1) or R2 location. Place the resistor as close to the module as possible. Table 2-1 DC/DC CONVERTER ADJUSTMENT RANGE AND FORMULA PARAMETERS Series Pt # 48V Bus PT4529 PT4526 PT4527 PT4528 PT4521 PT4522 PT4523 PT4524 24V Bus PT4509 PT4506 PT4507 PT4508 PT4501 PT4502 PT4503 PT4504 Max Current 2 5A 5A 5A 5A 5A 4A 1.6A 1.3A Figure 2-1 (R1) Adj Down Adjust Up +V in –V in +V o –V o PT4500/4520 +Vout –Vout +Vin –Vin Remote On/Off V o (adj) 2, 3 4, 5 9,10 7, 8 4. Never connect capacitors to V o adjust. Any capacitance added to the V o adjust control pin will affect the stability of the converter. The values of (R1) [adjust down], and R 2 [adjust up], can also be calculated using the following formulas. (R1) = Ko(Va – Vr) – Rs kΩVr (Vo – Va) R2 = Ko – Rs kΩ (Va – Vo) Where Vo = Original output voltage Va = Adjusted output voltage Vr = Reference voltage (Table 2-1) Ko = Multiplier constant (Table 2-1) Rs = Internal series resistance (Table 2-1) PT4500/4520 Series

For technical support and more information, see inside back cover or visit www.ti.com Application Notes continued PT4522 PT4502 5.0Vdc Va(req’d) 4.5 (12.6)kΩ 4.55 (40.3)kΩ 4.6 (75.0)kΩ 4.65 (120.0)kΩ 4.7 (179.0)kΩ 4.75 (262.0)kΩ 4.8 (387.0)kΩ 4.85 (595.0)kΩ 4.9 (1.01)MΩ 4.95 5.0 5.05 5.1 1.06M Ω 5.15 645.0k Ω 5.2 437.0k Ω 5.25 312.0k Ω 5.3 229.0k Ω 5.35 169.0k Ω 5.4 125.0k Ω 5.45 90.2k Ω 5.5 62.4k Ω 48V Bus PT4529 PT4526 PT4527 PT4528 PT4521 24V Bus PT4509 PT4506 PT4507 PT4508 PT4501 Va(req’d) 1.05 (15.1)kΩ 1.1 (126.0)kΩ 1.15 (458.0)kΩ 1.2 1.25 543.0k Ω 1.3 197.0k Ω 1.35 81.1k Ω (2.8)kΩ 1.4 (53.2)kΩ 1.45 (204.0)kΩ 1.5 1.55 1.3M Ω 1.6 627.0k Ω 1.65 404.0k Ω (51.7)kΩ 1.7 (161.0)kΩ 1.75 (489.0)kΩ 1.8 1.85 1.28M Ω 1.9 587.0k Ω 1.95 355.0k Ω 2.25 (26.5)kΩ 2.3 (92.9)kΩ 2.35 (203.0)kΩ 2.4 (425.0)kΩ 2.45 (1.09)MΩ 2.5 2.55 1.09M Ω 2.6 450.0k Ω 2.65 237.0k Ω 2.7 131.0k Ω 2.75 67.7k Ω 2.95 (90.7)kΩ 3.0 (146.0)kΩ 3.05 (224.0)kΩ 3.1 (341.0)kΩ 3.15 (536.0)kΩ 3.2 (926.0)kΩ 3.25 (2.09.0)MΩ 3.3 3.35 1.19M Ω 3.4 502.0k Ω 3.45 272.0k Ω 3.5 158.0k Ω 3.55 88.7k Ω 3.6 42.7k Ω 3.65 9.9k Ω Table 2-2 DC/DC CONVERTER SERIES ADJUSTMENT RESISTOR VALUES Series Pt # R1 = (Blue) R2 = Black PT4523 PT4524 PT4503 PT4504 12.0Vdc 15.0Vdc Va(req’d) 10.8 (276.0)kΩ 11.0 (365.0)kΩ 11.2 (497.0)kΩ 11.4 (719.0)kΩ 11.6 (1.16)MΩ 11.8 12.0 12.2 588.0k Ω 12.4 239.0k Ω 12.6 123.0k Ω 12.8 64.6k Ω 13.0 29.7k Ω 13.2 6.4k Ω 13.5 (312.0)kΩ 13.6 (345.0)kΩ 13.8 (427.0)kΩ 14.0 (542.0)kΩ 14.2 (713.0)kΩ 14.4 (1.0)MΩ 14.6 (1.57)MΩ 14.8 15.0 15.2 597.0k Ω 15.4 253.0k Ω 15.6 138.0k Ω 15.8 81.0k Ω 16.0 46.6k Ω 16.5 0.8k Ω PT4500/4520 Series

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