Datasheet
DS_
T48SR3R307_10162012
2
TECHNICAL SPECIFICATIONS
(T
A
=25°C, airflow rate=300 LFM, V
in
=48Vdc, nominal Vout unless otherwise noted;
PARAMETER NOTES and CONDITIONS T48SR3R307 (Standard)
Min. Typ. Max. Units
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Continuous 80 Vdc
Transient 100ms 100 Vdc
Operating Temperature -40 85 °C
Storage Temperature -55 125 °C
Input/Output Isolation Voltage 1500 Vdc
INPUT CHARACTERISTICS
Operating Input Voltage 36 48 75 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 5 Vdc
Maximum Input Current 100% Load, 36Vin 1 A
No-Load Input Current Vin=48V, Io=0A 40 mA
Off Converter Input Current Vin=48V, Io=0A 9 mA
Inrush Current (I
2
t) 1 A
2
s
Input Reflected-Ripple Current P-P thru 12µH inductor, 5Hz to 20MHz 40 mA
Input Voltage Ripple Rejection 120 Hz -50 dB
OUTPUT CHARACTERISTICS
Output Voltage Set Point Vin=48V, Io=0, Tc=25°C 3.25 3.3 3.35 Vdc
Output Voltage Regulation
Over Load Vin=48V, Io=Io,min to Io,max ±5 ±10 mV
Over Line Vin=36V to 75V, Io=Io max ±5 ±10 mV
Over Temperature Vin=48V, Tc=-40°C to 85°C ±10 mV
Total Output Voltage Range over sample load, line and temperature 3.2 3.4 Vdc
Output Voltage Ripple and Noise 5Hz to 20MHz bandwidth
Peak-to-Peak Full Load, 400µF ceramic 25 mV
RMS Full Load, 400µF ceramic 5 mV
Operating Output Current Range 0 7.5 A
Output DC Current-Limit Inception Output Voltage 10% Low 110 160 %
DYNAMIC CHARACTERISTICS
Output Voltage Current Transient 48V, 400µF Ceramic load cap, 1A/µs
Positive Step Change in Output Current 50% Io.max to 75% Io.max 115 mV
Negative Step Change in Output Current 75% Io.max to 50% Io.max 115 mV
Settling Time (within 1% Vout nominal) 130 µs
Turn-On Transient
Start-Up Time, From On/Off Control 10 30 ms
Start-Up Time, From Input 15 30 ms
Maximum Output Capacitance Full load; 0 400 5000 µF
EFFICIENCY
100% Load Vin=48V 86 %
60% Load Vin=48V 85 %
ISOLATION CHARACTERISTICS
Input to Output 1500 Vdc
Isolation Resistance 10 MΩ
Isolation Capacitance 1300 pF
FEATURE CHARACTERISTICS
Switching Frequency 480 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 2.4 5 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 2.4 5 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=5V uA
Output Over-Voltage Protection 120 140 %
GENERAL SPECIFICATIONS
MTBF Vin=48V; Io=80% of Io, max; Ta=25°C; 100LFM 5.3 M hours
Weight(open frame) 8.2 grams
Over-Temperature Shutdown (Hot Spot)
Refer to Figure 24 for Hot spot location
(48Vin,80%Io, 200LFM,Airflow from Vin+ to Vin-)
128 °C
Over-Temperature Shutdown (NTC Resistor) Refer to Figure 24 for NTC resistor location 125 °C
Note: Please attach thermocouple on NTC resistor to test OTP function, the hot spot’s temperature is just for reference.