QM48S25050

QM48T25050 BEL | Alldatasheet

Document overview

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Technical content

The QM Series of high current single output dc -dc converters sets new standards for thermal performance and power density in the quarter -brick package. The QM48T/S25050 converters of the QM Series provide thermal performance in high temperature environments that is co mparable to or exceeds the industry’s leading 5 V half -bricks. This is accomplished through the use of patent pending circuit, packaging and processing techniques to achieve ultra- high efficiency, excellent thermal management, and a very low body profile. Low body profile and the preclusion of heat sinks minimize impedance to system airflow, thus enhancing cooling for both upstream and downstream devices. The use of 100% automation for assembly, coupled with advanced electric and thermal design, results in a product with extremely high reliability. Operating from a 36-75 V input, the QM Series converters provide outputs that can be trimmed from –20% to +10% of the nominal output voltage, thus providing outstanding design flexibility.

• RoHS lead-free solder and lead-solder-exempted products are available
• Delivers up to 25 A @ 5.0 V
• Industry-standard quarter brick pinout
• On-board input differential LC-filter
• High efficiency – no heat sink required
• Start-up into pre-biased output
• No minimum load required
• Available in through-hole and surface-mount packages
• Low profile: 0.28” [7.1 mm] SMT version,
• 0.31” [7.9 mm] TH version
• Low weight: 1.1 oz [31.5 g] typical
• Meets Basic Insulation requirements of EN60950
• Withstands 100 V input transient for 100 ms
• Fixed-frequency operation
• Fully protected
• Remote output sense
• Output voltage trim range: +10%/−20% with
• industry-standard trim equations
• High reliability: MTBF of 2.6 million hours,
• calculated per Telcordia TR-332, Method I Case 1
• Positive or negative logic ON/OFF option
• UL60950 recognized in US and Canada and
• Approved to the following Safety Standards: UL/CSA60950-1, EN60950-1, and IEC60950-1
• Meets conducted emissions requirements of FCC Class B and EN 55022 Class B with external filter
• All materials meet UL94, V-0 flammability rating

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tech.support@psbel.com Conditions: TA = 25ºC, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, unless otherwise specified. PARAMETER CONDITIONS / DESCRIPTION MIN TYP MAX UNITS Absolute Maximum Ratings Input Voltage Continuous 0 80 VDC Operating Ambient Temperature -40 85 °C Storage Temperature -55 125 °C Input Characteristics Operating Input Voltage Range 36 48 75 VDC Input Under Voltage Lockout Turn-on Threshold Non-latching 33 34 35 VDC Input Under Voltage Lockout Turn-off Threshold 31 32 33 VDC Input Voltage Transient 100 ms 100 VDC Maximum Input Current 25 ADC, 5 VDC Out @ 36 VDC In 3.9 ADC Input Stand-by Current Vin = 48 V, converter disabled 2.65 mADC Input No Load Current (0 load on the output) Vin = 48 V, converter enabled 52 mADC Input Reflected-Ripple Current 25 MHz bandwidth 12.5 mAPK-PK Input Voltage Ripple Rejection 120 Hz TBD dB Output Characteristics External Load Capacitance Plus full load (resistive) 10,000 μF Output Current Range 0 25 ADC Current Limit Inception Non-latching 27.5 30 34.5 ADC Peak Short-Circuit Current Non-latching. Short = 10 mΩ. 31 50 A RMS Short-Circuit Current Non-latching 6.5 Arms Output Voltage Set Point (no load) 4.950 5.000 5.050 VDC Output Regulation Over Line ±2 ±5 mV Output Regulation Over Load ±2 ±5 mV Output Voltage Range Over line, load and temperature2 4.925 5.075 VDC Output Ripple and Noise - 25 MHz bandwidth Full load + 10 μF tantalum + 1 μF ceramic 30 50 mVPK-PK Isolation Characteristics I/O Isolation 2000 VDC Isolation Capacitance 1.4 nF Isolation Resistance 10 MΩ Feature Characteristics Switching Frequency 340 kHz Output Voltage Trim Range1 Industry-std. equations -20 +10 % Remote Sense Compensation1 Percent of VOUT(nom) +10 % Output Over-Voltage Protection Non-latching 117 128 140 % Auto-Restart Period Applies to all protection features 100 ms Turn-On Time 4 ms

Figure 1. Circuit configuration for ON/OFF function. when the ON/OFF pin is left open.

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timing waveforms associated with use of the ON/OFF pin. Figure 2. Remote sense circuit configuration connections are not made, the converter will deliver an output voltage that is slightly higher than the specified value. discretely, twisted pair wires should be used to connect the sense lines to the load to reduce susceptibility to noise. minimized to prevent unwanted triggering of the OVP. of the converter, equal to the product of the nominal output voltage and the allowable output current for the given conditions. output power remains at or below the maximum allowable output power. internally between the TRIM and SENSE(-) pins.

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drops below 60% of the nominal value of output voltage, the converter will shut down. rises above 60% of its nominal value. has shut down, it will attempt to restart every 100 ms until the OVP condition is removed. cooled to a safe operating temperature, it will automatically restart. Insulation is provided between input and output. of 7A is recommended for use with this product. characteristics - Limits and methods of measurement. Effective internal LC differential filter significantly reduces input reflected ripple current, and improves EMC. B per FCC Title 47CFR, Part 15-J. Please contact Bel Power Solution Applications Engineering for details of this testing. Figure 5. Location of the thermocouple for thermal testing

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tech.support@psbel.com The converter has been characterized for many operational aspects, to include thermal derating (maximum load current as a function of ambient temperature and airflow) for vertical and horizontal mounting, efficiency, start -up and shutdown parameters, output ripple and noise, transient response to load step-change, overload, and short circuit. The following pages contain specific plots or waveforms associated with the converter. Additional comments for specific data are provided below. All data presented were taken with the converter soldered to a test board, specifically a 0.060” thick printed wiring board (PWB) with four layers. The top and bottom layers were not metalized. The two inner layers, comprising two-ounce copper, were used to provide traces for connectivity to the converter. The lack of metalization on the outer layers as well as the limited thermal connection ensured that heat transfer from the converter to the PWB was minimized. This provides a worst- case but consistent scenario for thermal derating purposes. All measurements requiring airflow were made in vertical and horizontal wind tunnel facilities using Infrared (IR) thermography and thermocouples for thermometry. Ensuring components on the converter do not exceed their ratings is important to maintaining high reliability. If one anticipates operating the converter at or close to the maximum loads specified in the derating curves, it is prudent to check actual operating temperatures in the application. Thermographic imaging is preferable; if this capability is not available, then thermocouples may be used. Bel Power Solutions recommends the use of AWG #40 ga uge thermocouples to ensure measurement accuracy. Careful routing of the thermocouple leads will further minimize measurement error. Refer to Figure H for optimum measuring thermocouple location. Load current vs. ambient temperature and airflow rates are given in Figs. 9-12 for vertical and horizontal converter mounting both through-hole and surface mount version. Ambient temperature was varied between 25°C and 85°C, with airflow rates from 30 to 500 LFM (0.15 to 2.5 m/s). For each set of conditions, the maximum load current was defined as the lowest of: (i) The output current at which either any FET junction temperature did not exceed a maximum specified temperature (120°C) as indicated by the thermographic image, or (ii) The nominal rating of the converter (25 A) During normal operation, derating curves with maximum FET temperature less than or equal to 120 °C should not be exceeded. Temperature on the PCB at the therm ocouple location shown in Fig. 13 should not exceed 118 °C in o rder to operate inside the derating curves. 4.4 Fig.13 shows the efficiency vs. load current plot for ambient temperature of 25 ºC, airflow rate of 300 LFM (1.5 m/s) with vertical mounting and input voltages of 36 V, 48 V and 72 V. Also, a plot of efficiency vs. load current, as a function of ambient temperature with Vin = 48 V, airflow rate of 200 LFM (1 m/s) with vertical mounting is shown in Fig. 14. Fig. 15 shows the power dissipation vs. load current plot for Ta = 25ºC, airflow rate of 300 LFM (1.5 m/s) with vertical mounting and inp ut voltages of 36 V, 48 V and 72 V. Also, a plot of power dissipation vs. load current, as a function of ambient temperature with Vin = 48 V, airflow rate of 200 LFM (1 m/s) with vertical mounting is shown in Fig. 16. Output voltage waveforms, during the turn-on transient using the ON/OFF pin for full rated load currents (resistive load) are shown without and with external load capacitance in Fig. 17 and Fig. 18, respectively. Figure 20 shows the output voltage ripple waveform, measured at full rated load current with a 10 µF tantalum and 1 µF ceramic capacitor across the output. Note that all output voltage waveforms are measured across a 1 F ceramic capacitor. The input reflected ripp le current waveforms are obtained usi ng the test setup shown in Fig 21 . The corresponding waveforms are shown in Figs. 22 and 23.

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Figure 15. Power dissipation vs. load current and input Figure 16. Power dissipation vs. load current and ambient Figure 17. Turn-on transient at full rated load current (resistive) voltage (2 V/div.) Time scale: 2 ms/div. Figure 18. Turn-on transient at full rated load current trace: output voltage (2 V/div.). Time scale: 2 ms/div. Figure 19. Output voltage response to load current step- ceramic. Time scale: 0.2 ms/div. Figure 20. Output voltage ripple (20 mV/div.) at full rated load ceramic and Vin = 48 V. Time scale: 1 s/div.

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tech.support@psbel.com

• All dimensions are in inches [mm]
• Connector Material: Copper
• Connector Finish: Gold over Nickel
• Converter Weight: 1.1oz [31.5 g]
• Recommended Surface-Mount Pads: PAD/PIN CONNECTIONS Pad/Pin # Function

1 Vin (+)

2 ON/OFF

3 Vin (-)

4 Vout (-)

5 SENSE (-)

6 TRIM

7 SENSE (+)

8 Vout (+)

QM48T (Through-Hole)

• All dimensions are in inches [mm]
• Pins 1-3 and 5-7 are Ø 0.040” [1.02] with Ø 0.078” [1.98] shoulder
• Pins 4 and 8 are Ø 0.062” [1.57] without shoulder
• Pin Material: Brass
• Pin Finish: Tin/Lead over Nickel or Matte Tin over Nickel for “G” version
• Converter Weight: 1.1 oz [31.5 g] typical Height Option HT (Maximum Height) CL (Minimum Clearance) Pin Option PL (Pin Length) ±0.005 [±0.13] A 0.188 [4.77] B 0.145 [3.68] C 0.110 [2.79]

+86 755 298 85888 Europe, Middle East +353 61 225 977 North America +1 408 785 5200 © 2020 Bel Power Solutions & Protection BCD.00631_AB3 Product Series Input Voltage Mountin g Scheme Rated Load Current Output Voltage ON/OFF Logic Maximum Height [HT] Pin Length [PL] Special Features RoHS QM 48 T 25 050 - N B A 0 Quarter- Brick Format 36-75 V Surface Mount T  Through Hole 25 ADC 050  5.0 V N  Negative P  Positive SMT S  0.295” Through hole A  0.325” B  0.358” D  0.422” SMT 0  0.00” Through hole A  0.188” B  0.145” C  0.110” 0  STD No Suffix  RoHS lead-solder- exemption compliant G  RoHS compliant for all six substances The example above describes P/N QM48T25050-NBA0: 36-75 V input, through-hole, 25 A @ 5 V output, negative ON/OFF logic, a maximum height of 0.358”, a through the board pin length of 0.188”, and RoHS lead-solder-exemption compliancy. Please consult factory regarding availability of a specific version. NUCLEAR AND MEDICAL APPLICATIONS - Products are not designed or intended for use as critical components in life support systems, equipment used in hazardous environments, or nuclear control systems. TECHNICAL REVISIONS - The appearance of products, including safety agency certifications pictured on labels, may change depending on the date manufactured. Specifications are subject to change without notice.