mb3881pff Fujitsu Microelectronics, Inc., mb3881pff Datasheet - Page 19

• Manufacturer Part Number: mb3881pff
• Description: 8-ch Dc/dc Converter Ic With Synchronous Rectifier For Voltage Step-up And Step-down
• Manufacturer: Fujitsu Microelectronics, Inc.

4. Soft Start Operation
(1) Description
• When the CTL-1 to CTL-4 pins are driven high (“H” level)
The channel-8 output voltage is soft-started by the capacitor (C
The capacitor (Cs) connected to the CS terminal (pin 32) starts being charged and the output voltages of channels
1 to 4 and channel 8 are soft-started by the error amplifier in proportion to the CS pin voltage.
VREF ( pin 24)
CH8 output voltage
V
Input
Output
O
8
CH5, CH6 output
voltage V
CH1 to CH4, CH7
output voltage
V
CTL-1 ( pin 28 )
CTL-2 ( pin 29 )
CTL-3 ( pin 30 )
CTL-4 ( pin 31 )
O
CS ( pin 32)
1 to V
VB ( pin 36)
FB8 ( pin 4)
(1) to (4) : CH1 to CH4, CH7 soft start interval
(2) to (3) : CH8 soft start interval
O
O
4, V
5, V
O
O
7
6
2.5 V
2 V
0.3 V
(1)
(2)
1.25 V
(3)
(4)
+IN8
) connected to the +IN8 terminal (pin 6).
MB3881
t
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