DCDC
Specification
75350 Watts
• Wide Input Range
• Industry Standard Packages
• 40 °C to +100 °C Operating Temperature
• High Power Density
•
Base Plate Cooled
• Remote On/Off & Remote Sense
• 3 Year Warranty
QSB Series
Input
Input Voltage Range • See tables
Input Current • See tables
Input Reverse Voltage • None
Protection
Input Filter • Pi network
Undervoltage Lockout • QSB75-150: 24 Vin: - turn on 8.8 V,
turn off 8.0 V for 9-36 V,
QSB200: 24 Vin -turn on 9.6 V,
turn off 8.8 V,
QSB75-200: 48 Vin - turn on 17.0 V,
turn off 16.0 V,
QSB350: 24 Vin - turn on 17.0 V,
turn off 16.0 V,
QSB350: 48 Vin - turn on 35.0 V,
turn off 33.0 V
Input Surge • 24 Vin: 50 VDC for 100 ms
48 Vin: 100 VDC for 100 ms
Output
Output Voltage Trim • ±10%, see application notes
Initial Set Accuracy • ±1.5% max
Line Regulation • ±0.2% max measured from high line
to low line
Load Regulation • ±0.2% max measured from 0-100% load
Transient Response • 5% max deviation, recovery to within
1% in 500 µs, 25% step load change
Ripple & Noise • 3.3 & 5 V models: 100 mV pk-pk
12 & 15 V models: 150 mV pk-pk
24 V & 28 V models: 280 mV max pk-pk
20 MHz bandwidth (see note 1)
Overvoltage Protection • 115-140%
Short Circuit Protection • Continuous
Thermal Shutdown • Case temperature >105 °C
Temperature • ±0.03%/°C
Coefficient
Current Limit • 110-140% nominal output for 75 & 150 W
110-160% nominal output for 100 W
110-150% nominal output for 200 W
105-140% nominal output for 350 W
Remote On/Off • See notes 2 & 3
Remote Sense • Compensates up to 10% of Vout nominal,
total of output trim and remote sense
xppower.com
General
Efficiency • See tables
Isolation Voltage • 1500 VDC Input to Output
1500 VDC Input to Case
1500 VDC Output to Case
Isolation Resistance • 10
7
Ω
Isolation Capacitance • QSB75-200: 100 pF typical,
QSB350: 1000 pF typical
Switching Frequency • QSB75: 300 kHz typical
QSB100, 150 & 200: 250 kHz typical
QSB350 (3V3 & 5 V): 300 kHz typical
QSB350 (12, 24 & 28 V): 330 kHz typical
Power Density • QSB75: 45.4 W/in
3
, QSB100: 60.5 W/in
3
,
QSB150: 57.2 W/in
3
, QSB200: 70.3 W/in
3
,
QSB350: 123.0 W/in
3
MTBF • QSB75 & 100: 730 kHrs
QSB150 & 200: 1 MHrs
QSB350: 658 kHrs
typical to MIL-HDBK-217F at 25 °C, GB
Environmental
Operating Base Plate • -40 °C to +100 °C, see derating curves
Temperature
Storage Temperature • -55 °C to +105 °C
Operating Humidity • Up to 90% non-condensing
Cooling • Base plate cooled, see derating curves
Shock • 30 g pk, halfsink wave for 18 ms
3 pulses per face, all 6 faces tested
Vibration • 5-500 Hz st 3 g, 10 mins per axis
EMC & Safety
Emissions • EN55022, level A conducted with external
components, see test reports for further
details
ESD Immunity • EN61000-4-2, level 2, Perf Criteria B
Radiated Immunity • EN61000-4-3, 3 V/m, Perf Criteria A
EFT/Burst • EN61000-4-4, level 1, Perf Criteria A*
Surge • EN61000-4-5, level 1, Perf Criteria A*
Conducted Immunity • EN61000-4-6, 3 V rms
Perf Criteria A
Safety Approvals • QSB150 & QSB200: UL60950-1
* Recommended protection SMCJ40A for 24 Vin, SMCJ78A for 48 Vin