DS_Q48SK12025_08232011
2
TECHNICAL SPECIFICATIONS
(T
A
=25°C, airflow rate=300 LFM, V
in
=48Vdc, nominal Vout unless otherwise noted;
PARAMETER NOTES and CONDITIONS Q48SK12025 (Standard)
Min. Typ. Max. Units
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Continuous 80 Vdc
Transient 100ms 100 Vdc
Operating Hot Spot Temperature (Without heat spreader) Refer to figure 18 for measuring point -40 118 °C
Operating Case Temperature (With heat spreader) Refer to figure 20 for measuring point -40 112 °C
Storage Temperature -55 125 °C
Input/Output Isolation Voltage 2250 Vdc
INPUT CHARACTERISTICS
Operating Input Voltage 36 48 75 Vdc
Input Under-Voltage Lockout
Turn-On Voltage Threshold 32.0 34.0 36.0 Vdc
Turn-Off Voltage Threshold 30.0 32.0 34.0 Vdc
Lockout Hysteresis Voltage 2 Vdc
Maximum Input Current 100% Load, 36Vin 11 A
No-Load Input Current Vin=48V, Io=0A 160 mA
Off Converter Input Current Vin=48V, Io=0A 10 mA
Inrush Current (I
2
t) 1 A
2
s
Input Reflected-Ripple Current P-P thru 12µH inductor, 5Hz to 20MHz 10 mA
Input Voltage Ripple Rejection 120 Hz -30 dB
OUTPUT CHARACTERISTICS
Output Voltage Set Point Vin=48V, Io=0, Tc=25°C 11.4 11.7 12.0 Vdc
Output Voltage Regulation
Over Load Vin=48V, Io=Io,min to Io,max ±30 ±80 mV
Over Line Vin=36V to 75V, Io=Io min ±50 mV
Over Temperature Vin=48V, Tc=-40°C to 85°C ±100 mV
Total Output Voltage Range over sample load, line and temperature 11.2 12.0 Vdc
Output Voltage Ripple and Noise 5Hz to 20MHz bandwidth
Peak-to-Peak Full Load, 1µF ceramic, 10µF tantalum 120 mV
RMS Full Load, 1µF ceramic, 10µF tantalum 50 mV
Operating Output Current Range 0 25 A
Output DC Current-Limit Inception Output Voltage 10% Low 110 140 %
DYNAMIC CHARACTERISTICS
Output Voltage Current Transient 48V, 10µF Tan & 1µF Ceramic load cap, 0.1A/µs
Positive Step Change in Output Current 50% Io.max to 75% Io.max 300 mV
Negative Step Change in Output Current 75% Io.max to 50% Io.max 300 mV
Settling Time (within 1% Vout nominal) 300 µs
Turn-On Transient
Start-Up Time, From On/Off Control 70 ms
Start-Up Time, From Input 80 ms
Maximum Output Capacitance Low ESR CAP (OSCON), 100% load; 6000 µF
EFFICIENCY
100% Load Vin=48V 95.2 %
60% Load Vin=48V 94.7 %
ISOLATION CHARACTERISTICS
Input to Output 2250 Vdc
Isolation Resistance 10 MΩ
Isolation Capacitance 1000 pF
FEATURE CHARACTERISTICS
Switching Frequency 160 kHz
ON/OFF Control, Negative Remote On/Off logic
Logic Low (Module On) Von/off at Ion/off=1.0mA 0 0.8 V
Logic High (Module Off) Von/off at Ion/off=0.0 µA 2 50 V
ON/OFF Control, Positive Remote On/Off logic
Logic Low (Module Off) Von/off at Ion/off=1.0mA 0 0.8 V
Logic High (Module On) Von/off at Ion/off=0.0 µA 2 50 V
ON/OFF Current (for both remote on/off logic) Ion/off at Von/off=0.0V 1 mA
Leakage Current (for both remote on/off logic) Logic High, Von/off=15V 50 uA
Output Over-Voltage Protection Over full temp range; % of nominal Vout 115 140 %
GENERAL SPECIFICATIONS
MTBF(with heat spreader) Io=100% of Io, max; Tc=40°C;Airflow=600LFM 2.6 M hours
Weight(without heat spreader) 50.5 grams
Weight(with heat spreader) 65.5 grams
Over-Temperature Shutdown ( Without heat spreader) Refer to figure 18 for measuring point 126 °C
Over-Temperature Shutdown (With heat spreader) Refer to figure 20 for measuring point 122 °C
