MB3832APFV(1999) Просмотр технического описания (PDF) - Fujitsu

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MB3832APFV
(Rev.:1999)

DC/DC Converter IC for Charging

Fujitsu 

MB3832A

s METHOD OF SETTING FOR EXTERNAL SYNCHRONOUS OSCILLATION

For external synchronous oscillation, connect a timing capacitor (CT), a timing resistor (RT), and an external sync

signal to the CT, RT, and SYNC pins, respectively.

In this case, select the CT and RT so that the oscillation frequency is 5% to 10% lower than the frequency of the

external synchronous signal excluding the setting error of the oscillation frequency.

The duty cycle (T1/T) of the external sync signal must be set within a range from 10% to 90%.

<Triangular wave oscillator (OSC) equivalent circuit>

VREF

+

2I* 1.9 V

−

CT

3

−

Latch1

SQ

R

CT

+

1.3 V

SYNC

4

“L” level: ON

3I*

+

1.4 V

−

Latch2

SQ

R

<Free-run oscillation>

1.9 V

VCT

1.3 V

5.0 V

VSYNC

0V

*: | = VRT/RT, VRT (pin voltage at pin 2) = 1.0 V (typical)

<External synchronous oscillation>

1.9 V

VCT

1.3 V

5.0 V

VSYNC

0V

t

T1

T

t

15

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