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DS_S48SA1R812_06012006
TECHNICAL SPECIFICATIONS
(T
A
=25°C, airflow rate=300 LFM, V
in
=48Vdc, nominal Vout unless otherwise noted.)
PARAMETER
NOTES and CONDITIONS S48SA1R812NRFA
Min. Typ. Max. Units
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Continuous
80 Vdc
Transient (100ms) 100ms 100 Vdc
Operating Temperature Refer to Figure 18 for measuring point -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
32.5 34 35.5 V
Turn-Off Voltage Threshold
30.5 32 33.5 V
Lockout Hysteresis Voltage
1 2 3 V
Maximum Input Current 100% Load, 36Vin 0.85 A
No-Load Input Current 30 mA
Off Converter Input Current 7
m
A
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, Ta=25℃
1.77 1.80 1.83
V
Output Voltage Regulation
Over Load Io=Io,min to Io,max ±2 ±10 mV
Over Line Vin=36V to75V ±2 ±5 mV
Over Temperature Ta=-40C to 85C 100 300
pp
m/℃
Total Output Voltage Range Over sample load, line and temperature 1.73 1.87 V
Output Voltage Ripple and Noise 5Hz to 20MHz bandwidth
Peak-to-Peak Full Load, 1µF ceramic, 10µF tantalum 30 75 mV
RMS Full Load, 1µF ceramic, 10µF tantalum 5 20 mV
Operating Output Current Range 0 12 A
Output DC Current-Limit Inception Output Voltage 10% Low 13.2 15.6 18 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 35 100 mV
Negative Step Change in Output Current 75% Io,max to 50% Io.max 35 100 mV
Settling Time to 1% of Final value 200 µs
Turn-On Transient
Start-Up Time, From On/Off Control 6 12 ms
Start-Up Time, From Input 6 12
ms
Maximum Output Capacitance Full load; 5% overshoot of Vout at startup 2200 µF
EFFICIENCY
100% Load
86 88 %
ISOLATION CHARACTERISTICS
Isolation Voltage 1500 V
Isolation Resistance 10 MΩ
Isolation Capacitance 1500 pF
FEATURE CHARACTERISTICS
Switching Frequency 330 kHz
ON/OFF Control, (Logic Low-Module ON)
Logic Low Von/off at Ion/off=1.0mA 0 0.8 V
Logic High Von/off at Ion/off=0.0 µA 15 V
ON/OFF Current Ion/off at Von/off=0.0V 1 mA
Leakage Current Logic High, Von/off=15V 50 uA
Output Voltage Trim Range
A
cross Trim Pin & +Vo or
–
Vo, Pout≦max rated
-10 +10 %
Output Over-Voltage Protection(Hiccup) Over full temp range; % of nominal Vout 115 125 140 %
GENERAL SPECIFICATIONS
MTBF Io=80% of Io, max; Tc=40°C 6.29 M hours
Weight 18 grams
Over-Temperature Shutdown Refer to Figure 18 for measuring point 115 °C
2