MB3782(1994) 데이터 시트보기 (PDF) - Fujitsu

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MB3782
(Rev.:1994)

Switching Regulator Controller

Fujitsu 

MB3782

s USING THE RT PIN

The triangular waves, as shown in Figure 1, act to set the oscillator frequency by charging and discharging the

capacitor connected to the CT pin using the current value of the resistor connected to the RT pin.

In addition, when voltage level VREF/2 is output to external circuits from the RT pin, care must be taken in making

the external circuit connections to adjust for the fact that I1 is increased by the value of the current I2 to the

external circuits in determining the oscillator frequency (see Figure 2).

Triangular wave oscillator

VREF

2

2

IRT

RT

1

ICT

CT

ICT = IRT

= VREF

2RT

Figure 1 No VREF/2 connection to external circuits from RT pin

Triangular wave generator

To external circuits

VREF

2

2

IRT

IRT

I1

RT

1

ICT

CT

ICT = IRT

= I1 + I2

=

VREF

2RT

+ I2

Figure 2 VREF/2 connection to external circuits from RT pin

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