MB3775(1994) Просмотр технического описания (PDF) - Fujitsu

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MB3775
(Rev.:1994)

Switching Regulator Controller

Fujitsu 

MB3817

s METHOD OF SETTING THE OUTPUT CURRENT

The output circuit is comprised of a totem-pole configuration. Its output current waveform is such that the ON-

current value is set by constant current and the OFF-current value is set by a time constant. These output

currents are set using the equations below.

ON current: IO+ [mA] .=. 500 (Voltage on output current-setting pin VE = 0.5 V)

RE [Ω]

OFF current: OFF-current time constant = proportional to the value of CB

• Output circuit

OFF current

setting

Q4

block

Q6

D1

Q5

(0.5 V)

CB1

7 CB

8

CB2

9

VCC

Outside putting PNP transistor

OFF

current

10

OUT

ON current

RE

11

VE

• Output current waveform

0

ON current

OFF current

t

14

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