TDA4841 datasheet(39/60 Pages) PHILIPS

39 / 60 page

1999 Oct 25

Philips Semiconductors

Product speciﬁcation

I2C-bus autosync deﬂection controller for

PC monitors

TDA4841PS

Protection and standby mode

Soft-down sequence:

• Start the sequence by setting control bit SOFTST = 0

• BDRV duty cycle decreases

• HDRV duty cycle decreases.

Protection mode:

• Pins HDRV and BDRV are floating

• Pins VOUT1 and VOUT2 are floating

• Continuous blanking on pin CLBL is active

• Pin HUNLOCK is floating

• PLL1 and PLL2 are disabled

• Register contents are kept in internal memory.

Protection mode can be left by 3 ways:

1. Entering standby mode by setting control

bit SOFTST = 0 and bit STDBY = 1

2. Starting the soft-start sequence by setting control

bit SOFTST = 1 (bit STDBY = don’t care);

see L3 of Fig.18 for continuation

3. Decreasing the supply voltage below 8.1 V.

Standby mode:

• Set control bit STDBY = 1

• Driver outputs are floating (same as protection mode)

• Supply current is 9 mA

• Only the I2C-bus section and protection circuits are

operative

• Contents of all registers are lost, except the value of

bit STDBY and bit SOFTST

• See L2 of Fig.18 for continuation.

Fig.19 I2C-bus flow for standby mode and

protection mode.

(1) See Fig.18.

MGL790

Standby mode (XXXX XX01)

STDBY = 1

SOFTST = 0

all other register contents are random

Soft-down sequence (XXXX XX00)

STDBY = 0

SOFTST = 0

L3 (1)

yes

SOFTST = 1?

yes

L2 (1)

Protection mode (XXXX XX00)

STDBY = 0

SOFTST = 0

registers are set

STDBY = 1?

8CH

1AH

00H

A P

8CH

1AH

01H

A P

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