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Q48S08120 DC-DC Converter Data Sheet
36-75 VDC Input; 12 VDC @ 8A Output
Electrical Specifications
Conditions: T A =25oC, Airflow=300 LFM (1.5 m/s), Vin=48 Vdc, unless otherwise specified.
PARAMETER
NOTES
MIN
TYP
MAX
UNITS
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Operating Ambient Temperature
Storage Temperature
Continuous
0
-40
-55
80
85
125
Vdc
°C
°C
INPUT CHARACTERISTICS
Operating Input Voltage Range
36
48
75
Vdc
Input Under Voltage Lockout
Non-latching
Turn-on Threshold
Turn-off Threshold
Input Transient Withstand (Susceptibility)
100 ms
33
31
34
32
35
33
100
Vdc
Vdc
Vdc
OUTPUT CHARACTERISTICS
External Load Capacitance
Output Current Range
Plus full load (resistive)
0
2,200
8
μF
Adc
Current Limit Inception
Peak Short-Circuit Current
RMS Short-Circuit Current
Non-latching
Non-latching. Short=10m ? .
Non-latching
9
10
15
11
20
4
Adc
A
Arms
ISOLATION CHARACTERISTICS
I/O Isolation
Isolation Capacitance
Isolation Resistance
FEATURE CHARACTERISTICS
Switching Frequency
2000
10
230
435
Vdc
ρ F
M ?
kHz
Output Voltage Trim Range
1
Use trim equations on Page 6
-20
+10
%
Remote Sense Compensation
1
Percent of V OUT ( NOM )
+10
%
Output Over-Voltage Protection
Over-Temperature Shutdown (PCB)
Auto-Restart Period
Non-latching
Non-latching
Applies to all protection features
117
122
118
100
127
%
°C
ms
Turn-On Time
ON/OFF Control (Positive Logic)
4
ms
Converter Off
Converter On
-20
2.4
0.8
20
Vdc
Vdc
ON/OFF Control (Negative Logic)
Converter Off
Converter On
2.4
-20
20
0.8
Vdc
Vdc
Additional Notes:
1. V OUT can be increased up to 10% via the sense leads or up to 10% via the trim function, however total output voltage trim from all sources
should not exceed 10% of V OUT ( NOM ), in order to insure specified operation of over-voltage protection circuitry. See further discussion at end of
Output Voltage Adjust /TRIM section.
APR 29, 2003 revised to NOV 20, 2006
Page 2 of 14
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