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400 Watts
QSB Series
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Up to 89% Efficiency
4:1 Input Range
Industry Standard Full Brick Package
ꢀ40 °C to +100 °C Operating Temperature
Baseplateꢀcooled
Remote On/Off & Remote Sense
3 Year Warranty
Specification
Input
General
Input Voltage Range
Input Current
• 24 V (9-36 V), 48 V (18-75 V)
• See table
• 50 mA
Efficiency
• See tables
Isolation Voltage
• 1500 VDC Input to Output
1500 VDC Input to Case
1500 VDC Output to Case
Idle Current
Input Reverse Voltage • None
Protection
7
Isolation Resistance
• 10 Ω
Isolation Capacitance • 4000 pF typical
Input Filter
• Pi network
Switching Frequency
DC OK Signal
Power Density
MTBF
• 230 kHz typical
Undervoltage Lockout • 24 Vin: turn on 8.5 V, turn off 7.5 V
48 Vin: turn on 17.0 V, turn off 15.0 V
• DC OK open collector signal (see note 4)
3
Overvoltage Lockout
• 24 Vin: turn off 42.0 V, turn on 40.0 V
48 Vin: turn off 83.0 V, turn on 80.0 V
• 79 W/in
• 300 kHrs typical to MIL-HDBK-217F
at 25 °C, GB
Output
Environmental
Operating Base Plate • -40 °C to +100 °C, see derating curve
Output Voltage Trim
• 80-110% of nominal ouput, see
application notes
Initial Set Accuracy
Minimum Load
•
1.5% max
Temperature
• No minimum load required
Storage Temperature • -55 °C to +105 °C
Line Regulation
•
•
0.2% max measured from high line
to low line
0.5% max measured from 0-100% load
Operating Humidity
Cooling
• Up to 90% non-condensing
• Baseplate-cooled, see derating curve
• 75g pk, sawtooth wave for 10 ms, 3
pulses per face, all 6 faces tested on all 3
axes
Load Regulation
Start Up Time
Shock
• 120 ms typical
• 5% max deviation, recovery to within
1% in 500 µs, 25% step load change
Transient Response
Vibration
• 15-2000 Hz at 4g, 1 hour per axis
Ripple & Noise
• 5 V models: 100 mV pk-pk, other models
1% pk-pk, 20 MHz bandwidth (see note 1)
EMC & Safety
Overvoltage Protection • 115-140%
Short Circuit Protection • Continuous, constant current
Over Load Protection • 110-150% nominal output
Emissions
• EN55022, level A conducted, with external
components. See application notes.
Thermal Shutdown
• Case temperature 110 °C typical
• 0.03%/°C
Temperature
Coefficient
Remote Enable
• Referenced to -ve input,
Module on: 1-10 mA.
Module off: < 1 mA or open circuit
Optional ‘-P’ version
Module on: <1 mA or open circuit
Module off: 1-10 mA.
Internal 1kΩ current limit resistor is fitted.
Remote Sense
Current Share
• Compensates up to 10% of Vout nominal,
total of output trim and remote sense
• Parallel up to 4 modules using the parallel
pin 10% load share accuracy from 50%
to 100% load
Auxilliary Output
• 10 V 3 V/20 mA max
Auxilliary return is -Sense Pin
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