TDA4857PS datasheet(40/56 Pages) PHILIPS

Part #	TDA4857PS

Description	I2C-bus autosync deflection controller for PC monitors

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Manufacturer	PHILIPS [NXP Semiconductors]

Direct Link	http://www.nxp.com

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40 / 56 page

2000 Jan 31

40

Philips Semiconductors

Product speciﬁcation

I2C-bus autosync deﬂection controller for

PC monitors

TDA4857PS

PLL2 soft start sequence and PLL2 soft-down sequence

handbook, full pagewidth

VHPLL2

continuous blanking off

PLL2 enabled

frequency detector enabled

HDRV/HFLB protection enabled

4.7 V

3.4 V

1.7 V

time

HDRV duty cycle begins to increase

1 V

VOUT1 and VOUT2 enabled

BDRV duty cycle begins to increase

HDRV duty cycle has reached nominal value

2.8 V

BDRV duty cycle has reached nominal value

MGM084

handbook, full pagewidth

VHPLL2

continuous blanking (pin 16 and 17) activated

PLL2 disabled

frequency detector disabled

HDRV/HFLB protection disabled

4.7 V

3.4 V

1.7 V

time

HDRV floating

1 V

VOUT1 and VOUT2 floating

BDRV duty cycle begins to decrease(1)

2.8 V

BDRV floating

HDRV duty cycle begins to decrease(1)

MGM085

Fig.24 PLL2 soft start sequence and PLL2 soft-down sequence via the I2C-bus.

a. PLL2 soft start sequence, via the I2C-bus, if VCC > 8.6 V.

b. PLL2 soft-down sequence, via the I2C-bus, if VCC > 8.6 V.

(1) HDRV, BDRV, VOUT2 and VOUT1 are floating for VCC < 8.6 V.

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TDA4857PS Datasheet(PDF) 40 Page - NXP Semiconductors

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