DS_S48SR12001_07052006
2
TECHNICAL SPECIFICATIONS
(T
A
=25°C, airflow rate=300 LFM, V
in
=48Vdc, nominal Vout unless otherwise noted)
PARAMETER NOTES and CONDITIONS S48SR12001ERFA//B/C/D
Min. Typ. Max. Units
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Continuous 80 Vdc
Transient (100ms) 100ms 100 Vdc
Operating Case Temperature -40 100 °C
Storage Temperature -55 125 °C
Input/Output Isolation Voltage 1 minute 1500 Vdc
INPUT CHARACTERISTICS
Operating Input Voltage 36 48 75 V
Input Under-Voltage Lockout
Turn-On Voltage Threshold 33.8 34.5 35.8 V
Turn-Off Voltage Threshold 32.0 33.5 34.5 V
Lockout Hysteresis Voltage 1 2 3 V
Maximum Input Current 100% Load, 36Vin 0.6 A
No-Load Input Current 25 mA
Inrush Current(I
2
t) 0.01 A
2
s
Input Reflected-Ripple Current P-P thru 12µH inductor, 5Hz to 20MHz 5 mA
Input Voltage Ripple Rejection 120 Hz 50 dB
OUTPUT CHARACTERISTICS
Output Voltage Set Point Vin=48V, Io=50% Io, max, Tc=25℃ 11.76 12.00 12.24
V
Output Voltage Regulation
Over Load Io=Io,min to Io,max ±12 ±60 mV
Over Line Vin=36V to 75V ±12 ±36 mV
Over Temperature Tc=-40C to 100C 100 300 ppm/℃
Total Output Voltage Range Over sample load, line and temperature TBD TBD V
Output Voltage Ripple and Noise 5Hz to 20MHz bandwidth
Peak-to-Peak Full Load, 1µF ceramic, 10µF tantalum 50 100 mV
RMS Full Load, 1µF ceramic, 10µF tantalum 15 25 mV
Operating Output Current Range 0 1.25 A
Output DC Current-Limit Inception Output Voltage 10% Low 1.5 2 2.5 A
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 100 240 mV
Negative Step Change in Output Current 75% Io, max to 50% Io, max 100 240 mV
Setting Time to 1% of Final Value 600 µs
Turn-On Transient
Start-Up Time, From Input 35 50
ms
Maximum Output Capacitance Full load; 5% overshoot of Vout at startup 47 µF
EFFICIENCY
100% Load
84 86.5 %
ISOLATION CHARACTERISTICS
Isolation Voltage 1500 V
Isolation Resistance 100 MΩ
Isolation Capacitance 500 pF
FEATURE CHARACTERISTICS
Switching Frequency 290 kHz
Output Voltage Trim Range
Across Trim Pin & +Vo or -Vo, Pout≦max rated power -10 +10 %
Output Over-Voltage Protection Over full temp range; % of nominal Vout 115 125 140 %
GENERAL SPECIFICATIONS
Calculated MTBF Io=80% of Io, max; Tc=40°C 3 M hours
Weight (Encapsulated) 25.5 grams
Weight (Open Frame) 12.5 grams
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