LG MC-83A Manual De Uso página 48

1. Vertical IC operation
B+
(25V)
IC301
1) Vertical Drive Path
¡ Charging Path : i
3
here, Q1, Q2 and Q3 are pushpull Amps
¡ Discharging Path : i
4
2) Pump-up Circuit : Q4, Q5, D301 and C310
¡ In order to increase retrace speed
¡ C310 Reference Voltage change
Q5 Q4 V
ON OFF
OFF ON
3) i = i = i + I i = AC feedback
3 NFB 1 2 1
I = DC feedback
2
Slope determines Vertical Linearity
4)
I
1
Vertical Waveform
I
(output) 2
D301
C310
6 7
Q4
Q5
Q1
4
C310
24V
48V
: Defferentical Circuit
: Integral Circuit
50V
25V
3
50V
i3
Q2
25V
0V
2
Q3
i3 i4
V-DY
i4
C311
- 18 -
DY INPUT
Current