Q24S25020 DC-DC Converter Data Sheet 18-36 VDC Input 2.0 VDC 25A Output Description The Q24S25020 surface mounted DC-DC converter offers unprecedented performance in the industry-standard quarter brick format. This is accomplished through the use of patent pending circuit and packaging techniques to achieve ultra- high efficiency, excellent thermal performance and a very low body profile. In telecommunications applications the Q Family 25 A converters provide thermal performance that far exceeds all quarter-bricks and is comparable even to existing half-bricks. Low body profile and the preclusion of heat sinks minimize Q24S25020 Converter airflow shadowing, thus enhancing cooling for downstream devices. The use of 100% surface-mount technologies for assembly, coupled with Power-Ones advanced electronic Features and thermal circuitry and packaging, results in a product with extremely high quality and reliability. RoHS lead-free solder and lead-solder-exempted products are available 30 Delivers up to 25 A Higher current capability at 70C than existing 25 quarter-brick and half-brick converters High efficiency: 86% 25 A, 86% 12.5 A 20 Start-up into pre-biased output No minimum load required 15 No heat sink required 500 LFM (2.5 m/s) 400 LFM (2.0 m/s) Low profile: 0.26 6.6 mm 10 300 LFM (1.5 m/s) 200 LFM (1.0 m/s) Low weight: 1 oz 28 g typical 100 LFM (0.5 m/s) Industry-standard footprint: 1.45 x 2.30 30 LFM (0.15 m/s) 5 Meets Basic Insulation Requirements of EN60950 On-board LC input filter 0 20 30 40 50 60 70 80 90 Fixed-frequency operation Fully protected Ambient Temperature C Remote output sense Fig. 1: Available load current vs. ambient air temperature and air- Output voltage trim range: +10%/-20% flow rates for Q24S25020 converter mounted vertically with air flow- Trim resistor via industry-standard equations ing from pin 3 to pin 1, MOSFET temperature 120 C, Vin = 27 V. High reliability: MTBF 2.6 million hours, calculated per Telcordia TR-332, Method I Case 1 Positive or negative logic ON/OFF option Applications UL 60950 recognized in U.S. & Canada, and DEMKO Telecommunications certified per IEC/EN 60950 Data communications Meets conducted emissions requirements of FCC Wireless Class B and EN55022 Class B with external filter Servers All materials meet UL94, V-0 flammability rating MCD10154 Rev. 1.0, 9-Apr-10 Page 1 of 14 www.power-one.com Load Current Adc Q24S25020 DC-DC Converter Data Sheet 18-36 VDC Input 2.0 VDC 25A Output Electrical Specifications Conditions: T = 25 C, Airflow = 300 LFM (1.5 m/s), Vin = 24 VDC, unless otherwise specified. A PARAMETER NOTES MIN TYP MAX UNITS ABSOLUTE MAXIMUM RATINGS Input Voltage Continuous 0 40 Vdc Operating Ambient Temperature -40 85 C Storage Temperature -55 125 C INPUT CHARACTERISTICS Operating Input Voltage Range 18 24 36 Vdc Input Under Voltage Lockout Non-latching Turn-on Threshold 16 17 17.5 Vdc Turn-off Threshold 15 16 16.5 Vdc OUTPUT CHARACTERISTICS External Load Capacitance Plus full load (resistive) 30,000 F Output Current Range 0 25 Adc Current Limit Inception Non-latching 27.5 30 33 Adc Peak Short-Circuit Current Non-latching. Short=10m . 35 46 A RMS Short-Circuit Current Non-latching 6.7 Arms ISOLATION CHARACTERISTICS I/O Isolation 2000 Vdc Isolation Capacitance 230 F Isolation Resistance 10 M FEATURE CHARACTERISTICS Switching Frequency 435 kHz 1 Output Voltage Trim Range Use trim equations on Page 6 -20 +10 % 1 Remote Sense Compensation Percent of V (NOM) +10 % OUT Output Over-Voltage Protection Non-latching 117 122 127 % Over-Temperature Shutdown (PCB) Non-latching 118 C Auto-Restart Period Applies to all protection features 100 ms Turn-On Time 2.5 ms ON/OFF Control (Positive Logic) Converter Off -20 0.8 Vdc Converter On 2.4 20 Vdc ON/OFF Control (Negative Logic) Converter Off 2.4 20 Vdc Converter On -20 0.8 Vdc Additional Notes: 1. Vout can be increased up to 10% via the sense leads or up to 10% via the trim function, however total output voltage trim from all sources should not exceed 10% of V (NOM), in order to insure specified operation of over-voltage protection circuitry. See further discussion at end of OUT Output Voltage Adjust /TRIM section. MCD10154 Rev. 1.0, 9-Apr-10 Page 2 of 14 www.power-one.com