DS_E48SP12020NRFB_05232011
2
TECHNICAL SPECIFICATIONS
(T
A
=25°C, airflow rate=300 LFM, V
in
=48Vdc, nominal Vout unless otherwise noted.)
PARAMETER NOTES and CONDITIONS E48SP12020NRFB
Min. Typ. Max. Units
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Continuous 65 Vdc
Operating Case Temperature (Without heat spreader) Refer to figure 18 for measuring point -40 122 °C
Operating Case Temperature (With heat spreader) Refer to figure 20 for measuring point -40 110 °C
Storage Temperature -55 125 °C
Input/Output Isolation Voltage 2250 Vdc
INPUT CHARACTERISTICS
Operating Input Voltage 36 60 Vdc
Input Under-Voltage Lockout
Turn-On Voltage Threshold 32.5 34 35.5 Vdc
Turn-Off Voltage Threshold 30.5 32 33.5 Vdc
Lockout Hysteresis Voltage 1 2 3 Vdc
Maximum Input Current Vin=36V, 100% Load, 7 7.8 A
No-Load Input Current 70 150 mA
Off Converter Input Current 8 12 mA
Inrush Current(I
2
t) With 100uF external input capacitor 1 A
2
s
Start up Current Peak, Vin=36V, 100% Load, With 5000uF Co 7 12 A
Input Terminal Ripple Current RMS, Vin=48V, With 100uF input cap. 0.16 0.24 A
Input Reflected-Ripple Current P-P thru 12µH inductor, 5Hz to 20MHz 6 mA
Input Voltage Ripple Rejection 120 Hz 60 dB
OUTPUT CHARACTERISTICS
Output Voltage Set Point Vin=48V, Io=Io.max, Tc=25°C 11.67 11.85 12.02 Vdc
Output Voltage Regulation
Over Load Io=Io,min to Io,max +20 mV
Over Line Vin=36V to 60V +15 mV
Over Temperature Tc=-40°C to 125°C ±120 mV
Total Output Voltage Range over sample load, and temperature 11.5 11.85 12.2 V
Output Voltage Ripple and Noise 5Hz to 20MHz bandwidth
Peak-to-Peak Full Load, 1µF ceramic, 10µF tantalum 100 200 mV
RMS Full Load, 1µF ceramic, 10µF tantalum 40 80 mV
Operating Output Current Range Full input voltage range 0 20 A
Output DC Current-Limit Inception Output Voltage 10% Low 110 150 %
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 200 400 mV
Negative Step Change in Output Current 75% Io.max to 50% Io.max 200 400 mV
Setting Time (within 1% Vout nominal) 200 µs
Turn-On Transient
Start-Up Time, From On/Off Control 30 40 ms
Start-Up Time, From Input 30 40 ms
Maximum Output Capacitance Full load; no overshoot of Vout at startup 5000 µF
EFFICIENCY
100% Load Vin=48V 93.5 94.5 %
60% Load Vin=48V 94 95 %
ISOLATION CHARACTERISTICS
Input to Output 2250 Vdc
Isolation Resistance 10 MΩ
Isolation Capacitance 1500 pF
FEATURE CHARACTERISTICS
Switching Frequency 245 kHz
ON/OFF Control, Negative Remote On/Off logic
Logic Low (Module On) Von/off -0.7 0.8 V
Logic High (Module Off) Von/off 2.4 50 V
ON/OFF Control, Positive Remote On/Off logic
Logic Low (Module Off) Von/off -0.7 0.8 V
Logic High (Module On) Von/off 2.4 50 V
ON/OFF Current (for both remote on/off logic) Ion/off at Von/off=0.0
1 m
ON/OFF Current
for both remote on/off lo
ic
Ion/off at Von/off=2.4
10
Leakage Current (for both remote on/off logic) Logic High, Von/off=15V 50 µA
Output Over-Voltage Protection Over full temp range; % of nominal Vout 14.6 18 V
GENERAL SPECIFICATIONS
MTBF
Io=100% of Io, max; 300LFM; Ta=25°C
1.19 M hours
Weight Open frame 29.1 grams
Weight With heat spreader 39.2 grams
Over-Temperature Shutdown ( Without heat spreader) Refer to figure 18 for measuring point 132 °C
Over-Temperature Shutdown (With heat spreader) Refer to figure 20 for measuring point 120 °C
