JUN 23, 2004 revised to NOV 20, 2006 Page 13 of 14 www.power-one.com
Q48T08120 DC-DC Converter Data Sheet
3
6
-75 VDC In
p
ut; 12VDC
@
8A O
u
t
p
ut
Fig. 22: Output voltage ripple (50 mV/div.) at full rated load
current into a resistive load with Co = 10 µF tantalum + 1uF ce-
ramic and Vin = 48 V. Time scale: 1 µs/div.
Fig. 24: Input reflected ripple curent, i
c
(100 mA/div.), meas-
ured at input terminals at full rated load current and Vin = 48 V.
Refer to Fig. 23 for test setup. Time scale: 1µs/div.
Vout
Vsource
i
S
i
C
1 µF
ceramic
capacitor
10 µH
source
inductance
DC/DC
Converter
33 µF
ESR <1
electrolytic
capacitor
Q
TM
Family
Fig. 23: Test setup for measuring input reflected ripple cur-
rents, i
c
and i
s
.
Fig. 25: Input reflected ripple current, i
s
(10 mA/div.), measured
through 10 µH at the source at full rated load current and Vin =
48 V. Refer to Fig. 23 for test setup. Time scale: 1µs/div.
JUN 23, 2004 revised to NOV 20, 2006 Page 14 of 14 www.power-one.com
Q48T08120 DC-DC Converter Data Sheet
3
6
-75 VDC In
p
ut; 12VDC
@
8A O
u
t
p
ut
612
8
12
4
Iout [Adc]
Vout [Vdc]
0
0
82
10
2
6
14
410
Fig. 26: Output voltage vs. load current showing current limit
point and converter shutdown point. Input voltage has almost
no effect on current limit characteristic.
Fig. 27: Load current (top trace, 10 A/div, 20 ms/div) into a 10
m short circuit during restart, at Vin = 48 V. Bottom trace (10
A/div, 1 ms/div) is an expansion of the on-time portion of the
top trace.
Fig. 28: Location of the thermocouple for thermal testing.
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systems, equipment used in hazardous environments, or nuclear control systems without the express written consent of the respective divisional president of
Power-One, Inc.
TECHNICAL REVISIONS - The appearance of products, including safety agency certifications pictured on labels, may change depending on the date
manufactured. Specifications are subject to change without notice.

Q48T08120-NBB0

Mfr. #:
Manufacturer:
Bel
Description:
Module DC-DC 48VIN 1-OUT 12V 8A 8-Pin Quarter-Brick
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
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