MB3759_06 datasheet(15/28 Pages) FUJITSU

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MB3759 Datasheet(PDF) 15 Page - Fujitsu Component Limited.

Part #	MB3759

Description	Switching Regulator Controller (Switchable between push-pull and single-end functions)

Download	28 Pages

Scroll/Zoom	100%

Manufacturer	FUJITSU [Fujitsu Component Limited.]

Direct Link	http://edevice.fujitsu.com/fmd/en/index.html

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15 / 28 page

MB3759

3. Soft Start

A soft start function can be incorporated by using the dead-time control element (DT) pin (pin 4).

When the power is turned on, Cd is not yet charged and the DT input is pulled to the VREF pin (pin 14) causing

the output transistor to turn off. Next, the input voltage to the DT pin (pin 4) drops in accordance with the Cd,

Rd constant causing the output pulse width to increase steadily, providing stable control circuit operation.

If you wish to use both dead-time and softstart, combine these in an OR configuration.

4. Output Current Limiting (Fallback system using a detection resistor inserted on the output side)

(1) Typical example

VREF

VD =

R1+R2

Setting the dead-time

Incorporating soft start

VREF

VIO

GND

VO1

0IL3 IL2

IL1

−

Manufacturer	Part #	Datasheet	Description
Fujitsu Component Limit...	MB3759C	287Kb / 27P	Switching Regulator Controller (Switchable between push-pull and single-end functions)
	MB3759P	287Kb / 27P	Switching Regulator Controller (Switchable between push-pull and single-end functions)
	MB3759PF	287Kb / 27P	Switching Regulator Controller (Switchable between push-pull and single-end functions)

Manufacturer	Part #	Datasheet	Description
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