TDA8143 Datasheet, PDF (7/9 Pages) STMicroelectronics – HORIZONTAL DEFLECTION POWER DRIVER

Figure 6 : Block Diagram of the Integrated Horizontal Driver
PROTECTION
AND REMOTE 9
STANDBY INPUT
V OLTA GE
CONTROL
V_C < 7V
&
OV E RTE M P .
P R OTE CTI ON
T_j < 150˚C
Q9
V1
V2
INPUT
TRANSCONDUCTANCE
R1
R2
AMPLIFIER
Q10
R5
Q11
TDA8143
3
V
+
CC
CONTROL
INPUT
8
SPECIAL
REMOTE 7
STANDBY
I₂
&
Q5
Q3
Q4
R3
I_{1 Q6}
D1
Q2
Q1
Q7
D2
R4
R6
V_REF = 750mV
V _IN
Q8
I_B
2
OUTPUT
4
SENSE
INPUT
6
C _EXT
C_T
1
POWER
GROUND
5
SENSE
GROUND
In Figure 7 is shown the application diagram of the
TDA8143, the few external component and the
automatic handling possibility ensures a lower ap-
plication cost versus the conventional approach
shown in Figure 3.
In Figure 8 is shown the currents and voltage
waveforms of the driver circuit of Figure 7 as to be
seen, the driving charge Ib ⋅ ton has been reduced
at minimum.
The power dissipation on this application condition
is about 1.3W.
The presence of thermal shut-down circuit means
that the heatsink can have a smaller factor of safety
compared with that of a conventional circuit.
If for any reason, the junction temperature in-
creases up to 150^oC, the thermal shut-down simply
switches off the device.
7/9