TDA4856 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
TDA4856
VHPLL2
2 VHDRV
SOFT START
2.5 V ^OTA
SQ
RQ
VCC
R4⁽¹⁾
6
INVERTING
BUFFER
horizontal
flyback pulse
1
HORIZONTAL
OUTPUT
STAGE
EHT
3 VBDRV ^transformer
D2
DISCHARGE
5
EHT adjustment R1
VBIN
3
4
R2
VBOP
R3
D1
4 VBSENS
TR2
power-down
C1
CBSENS
>2 nF
(1) The recommended value for R4 is 1 kΩ.
CBOP > 10 nF
a. Forward mode application.
5 IMOSFET
TR1
MGM081
handboo₁k, f_hul_ol p_ria_zg_oe_nw_taid_lth
flyback pulse
2 VHDRV
3 VBDRV
VBOP
4 VBSENS
ton
td(BDRV)
5 IMOSFET
b. Waveforms for normal operation.
VBOP
toff (discharge time of CBSENS)
VRESTART(BSENS)
VSTOP(BSENS)
c. Waveforms for fault condition.
MBG602
Fig.23 Application and timing for feed forward mode.
1999 Jul 13
41