DS_s48SS12001_06082006
TECHNICAL SPECIFICATIONS
(T
A
=25°C, airflow rate=300 LFM, V
in
=48Vdc, nominal Vout unless otherwise noted.)
PARAMETER NOTES and CONDITIONS S48SS12001NRFA
Min. Typ. Max. Units
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Continuous 80 Vdc
Transient (100ms) 100ms 100 Vdc
Operating Temperature Refer to Figure 12 for the 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 33.8 34.5 35.8 V
Turn-Off Voltage Threshold 32.0 33.5 34.5 V
Lockout Hysteresis Voltage 0.5 1.5 2.5 V
Maximum Input Current 100% Load, 36Vin 0.6 A
No-Load Input Current 25 mA
Off Converter Input Current 1
m
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 55 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=-40℃ to 100℃ 100 300
m/℃
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 On/Off Control 35 50 ms
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 260 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 µA
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 12.5 grams
2
