MB3825A Fujitsu Microelectronics, Inc., MB3825A Datasheet - Page 26

• Manufacturer Part Number: MB3825A
• Description: 6-ch DC/DC Converter ic With Synchronous Rectifier
• Manufacturer: Fujitsu Microelectronics, Inc.

26
MB3825A
• Channel 3
The capacitor C
(pin 29) goes from “L” to “H” level, the transistor Q4 is turned off and the output voltage is in proportion to the
DTC3 terminal voltage providing the soft-start operation.
As the short detection function is not turned off during soft-start operation, this setting should be made under
the following condition.
Channel 3 soft-start circuit time
Figure 9. Channel 3 soft-start circuit
H : ON (CH3) CTL2
L : OFF
A
To V
Ra
Rb
REF
IN (C) 3
DTC3
IN (E) 3
FB3
C
DTC3
DTC3
32
33
29
34
34
is placed between the DTC3 terminal (pin 31) and GND, so that when the CTL2 terminal
1.5 V
1.5 V
Error
Amp.3
SCP
Comp.3
Short detection time
To CT1
To CSP
Q4
PWM
Comp.3
To UVLO
External PNP transistor
Output
stage
56
OUT1-3