SI9140DQ datasheet(8/15 Pages) VISHAY

No de pièce	SI9140DQ

Description	SMP Controller For High Performance Process Power Supplies

Download	15 Pages

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Fabricant	VISHAY [Vishay Siliconix]

Site Internet	http://www.vishay.com

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8 / 15 page

Si9140

Vishay Siliconix

S-58034—Rev. G, 15-Mar-99

FaxBack 408-970-5600, request 70026

8

www.siliconix.com

Pin 10: ROSC

A resistor connected from this pin to ground sets the

oscillator’s capacitor COSC, charge and discharge current.

See the oscillator section of the description of operation.

Pin 11: COSC

An external capacitor is connected to this pin to set the

oscillator frequency.

Pin 12: UVLOSET

This pin will place the chip in the standby mode if the

UVLOSET voltage drops below 1.2 V. Once the UVLOSET

voltage exceeds 1.2 V, the chip operates normally. There is a

built-in hysteresis of 165 mV.

Pin 13: PGND

The negative return for the VS supply.

Pin 14: DS

This CMOS push-pull output pin drives the external p-channel

MOSFET.

This pin will be high in the standby mode.

A

break-before-make function between DS and DR is built-in.

Pin 15: DR

This CMOS push-pull output pin drives the external n-channel

MOSFET.

This pin will be low in the standby mode.

A

break-before-make function between the DS and DR is built-in.

Pin 16: VS

The positive terminal of the power supply which powers the

CMOS output drivers. A bypass capacitor is required.

FUNCTIONAL BLOCK DIAGRAM

f

OSC

0.75

R

OSC

C

OSC

×

------------------------------------

(at V

DD

5.0 V)

=

≅

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