Vertical Scan Output Stage Circuit Tda8356/N6 - Changhong Electric 21NF55 Service Manual

1.3 Vertical scan output stage circuit TDA8356/N6

DC-coupled vertical deflection circuit TDA8356
1) Features
● Few external components
● Highly efficient fully DC-coupled vertical output bridge circuit
● Vertical flyback switch
● Guard circuit
● Protection against:
Short-circuit of the output pins (7 and 4)
Short-circuit of the output pins to VP.
● Temperature protection
● High EMC immunity because of common mode inputs
● A guard signal in zoom mode.
2) General Description
The TDA8356 is a power circuit for use in 90, and 110, colour deflection systems for field frequencies of
50 to 120 Hz. The circuit provides a DC driven vertical deflection output circuit, operating as a highly
efficient class G system.
3) Block Diagram
Symbol Pin
Idrive(pos) 1
Idrive(neg) 2
VP 3
VO(B) 4
GND 5
VFB 6
VO(A) 7
VO(guard) 8
VI(fb) 9
SERVICE MANUAL
Fig.12
Table 7
Description
input power-stage (positive ); includes II(sb) signal bias
input power-stage (negative); includes II(sb) signal bias
operating supply voltage
output voltage B
ground
input flyback supply voltage
output voltage A
guard output voltage
input feedback voltage
4) Pinning
26
Fig.13