MB3827 datasheet(32/41 Pages) FUJITSU

No de pièce	MB3827

Description	6-ch DC/DC Converter IC With Synchronous Rectification for voltage step-up and step-down

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Fabricant	FUJITSU [Fujitsu Component Limited.]

Site Internet	http://edevice.fujitsu.com/fmd/en/index.html

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MB3827

32

s METHOD OF SETTING THE DEAD TIME

When setting step-up/step-down switching, Zeta type, or fly-back type step-up or inverter output, the output

transistor at start-up is in full-on (ON duty cycle = 100%) state. To prevent this, the DTC voltage from the DTC1-

1 terminal (pin 43) to the DTC6 terminal (pin 15) voltage is determined from the VREF voltage, as shown in

following figure , so that the output transistor dead time (the maximum value of the ON interval) can be set easily.

When the voltage on the DTC5 and DTC6 terminals is lower than the triangular-wave output voltage from the

oscillator, the output transistor turns off. The dead time calculation formula assuming that triangular-wave am-

plitude := 0.7 V and triangular-wave maximum voltage := 1.8 V is given below.

When you do not use these DTC5 and DTC6 terminals, connect then to VREF terminal (pin 24) as shown

following figure (Not setting the channel 5,6 dead time).

Vdt

− 1.1

Rb

DUTY(ON)max :=

× 100[%], Vdt =

× VREF

0.7

Ra

+ Rb

24

16

VREF

DTC5

Ra

Rb

Vdt

24

15

VREF

DTC6

Ra

Rb

Vdt

Setting the channel 5, 6 dead time (same as for other channels)

16

VREF

DTC5

15

VREF

DTC6

24

Not setting the channel 5,6 dead time (same as for other channels)

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