TDA4857PS Datasheet, PDF (41/56 Pages) NXP Semiconductors – I2C-bus autosync deflection controller for PC monitors

Philips Semiconductors
I²C-bus autosync deflection controller for
PC monitors
Product specification
TDA4857PS
handbook, full pagewidth
VHPLL2
MHB108
4.6 V
continuous blanking off
PLL2 enabled
frequency detector enabled
HDRV/HFLB protection enabled
duty ^{cycle increases}
3.3 V BDRV duty cycle has reached nominal value
3.0 V BDRV duty cycle begins to increase
HDRV duty cycle has reached nominal value
1.7 V HDRV duty cycle begins to increase
time
a. PLL2 soft start sequence by external DC current, if V_CC > 8.6 V.
handbook, full pagewidth
VHPLL2
MHB109
4.6 V
continuous blanking (pin 16 and 17) activated
PLL2 disabled
frequency detector disabled
HDRV/HFLB protection disabled
3.3 V BDRV duty cycle begins to decrease⁽¹⁾
duty _{cycle decreases}
3.0 V
BDRV floating
HDRV duty cycle begins to decrease⁽¹⁾
1.7 V HDRV floating
time
b. PLL2 soft-down sequence by external DC current, if V_CC > 8.6 V.
(1) HDRV, BDRV, VOUT2 and VOUT1 are floating for V_CC < 8.6 V.
Fig.25 PLL2 soft start sequence and PLL2 soft-down sequence by external DC current.
2000 Jan 31
41