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QD48S018033 DC-DC Converter Data Sheet
36-75 VDC Input; 1.8 – 3.3 VDC @ 15A 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
Transient Withstand (Susceptibility)
Transient duration: 100 ms
33
31
34
32
35
33
100
Vdc
Vdc
V
OUTPUT CHARACTERISTICS
External Load Capacitance:
1.8 V
3.3 V
Plus full load (resistive)
Plus full load (resistive)
10,000
10,000
μF
μF
Output Current Range:
1.8 V
3.3 V
At nominal output voltage 1.8 V
At nominal output voltage 3.3 V
0
0
15
15
Adc
Adc
Current Limit Inception:
Peak Short-Circuit Current:
RMS Short-Circuit Current:
1.8 V
3.3 V
1.8 V
3.3 V
1.8 V
Non-latching
Non-latching
Non-latching. Short = 10 m ? .
Non-latching. Short = 10 m ? .
Non-latching
15.75
15.75
18
18
20
20
19.5
19.5
30
30
4
Adc
Adc
A
A
Arms
3.3 V
Non-latching
4
Arms
ISOLATION CHARACTERISTICS
I/O Isolation
Isolation Capacitance
Isolation Resistance
FEATURE CHARACTERISTICS
Switching Frequency
2000
10
1.3
435
Vdc
nF
M ?
kHz
Output Voltage Trim Range
1
1.8 V See section: Output Voltage Adjust/TRIM
3.3 V Simultaneous with 1.8 V output
-10
-10
+10
+10
%
%
Output Over-Voltage Protection
Over-Temperature Shutdown (PCB)
Auto-Restart Period
Turn-On Time
1.8 V Non-latching
3.3 V Non-latching
Non-latching
Applies to all protection features
3.3 V 1.8 V tracks 3.3 V
2.1
3.85
2.25
4.125
120
100
3
2.34
4.25
V
V
°C
ms
ms
ON/OFF Control (Positive Logic)
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. Vout1 and Vout2 can be simultaneously increased or decreased up to 10% via the Trim function. When trimming up, in order not to exceed
the converter‘s maximum allowable output power capability equal to the product of the nominal output voltage and the allowable output current
for the given conditions, the designer must, if necessary, decrease the maximum current (originally obtained from the derating curves) by the
same percentage to ensure the converter’s actual output power remains at or below the maximum allowable output power.
NOV 11, 2003 revised to NOV 20, 2006
Page 2 of 16
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