MB3832A Просмотр технического описания (PDF) - Fujitsu

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MB3832A

DC/DC Converter IC for Charging

Fujitsu 

MB3832A

s METHODS OF SETTING THE DEAD TIME

When the device is set for step-up inverted output based on the flyback method, the output transistor is fixed to

a full-ON state (ON duty = 100%) when the power supply is turned on. To prevent this problem, you may determine

the voltage at the DTC terminal (pin 16) from the VREF voltage so you can set the output transistor’s dead time

(maximum ON-duty period) as shown in Figure a below.

When the voltage at the DTC terminal (pin 16) is higher than the triangular wave output voltage from the oscillator,

the

0.6

output

V and

transistor

triangular

is turned off. The dead

wave minimum voltage

time calculation

.=. 1.3 V is given

formula

below.

assuming

that

triangular

wave

amplitude

.=.

Duty (ON) .=.

Vdt – 1.3 V

0.6 V

× 100 [%], Vdt =

R2

R1 + R2

×

VREF

When the DTC terminal is not used, connect it directly to the VREF terminal.

• Figure a Setting the dead time

• Figure b Not setting the dead time

1 VREF

R1

16 DTC

Vdt

R2

1 VREF

16 DTC

17

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