Mitsubishi V19-V21, Tehnical Manual

Page: 28 / 71

5-6
A sample of the 3.3V supply is fed back to pin 5 of
IC9B00 for regulation. Regulation is achieved by
controlling the PWM of the Gate drive signals.
The push-pull circuitry output is also used to gener-
ate the DM 5V supply. The signal, before filtering,
is stepped up by T9B00, but is not large enough to
generate 5 volts. To generate 5 volts the secondary
winding is clamped at 3.3 volts by Q9B02.
The LGATE output of IC9B00 supplies Gate drive
for Q9B02. When Q9B02 conducts it clamps the
Drain outputs to 3.3 volts. The clamping at 3.3 volts
and the stepped up signal from T9B00 are filtered to
form the DM 5V supply.
All current rated in mA.
Name
3.3V
1
3.3V
2
3.3V
3
3.3VS
1
5V
1
5V
2
5V
3
5VS
1
5VS
2
-9V
9V
1
9V
2
9V
3
Voltage 3.3 3.3 3.3 3.3 5 5 5 5 5 -9 9 9 9
3DYC
200 25 105
Ant.
Relay
Audio
Amp
Audio
Process
85
AV
Switch
150
Conv.
Gen
120 50 50 50 50
Conv.
Out
CRT
(video)
180
DBF
Digital
Module
3500 600
CRT
HV
H-Defl
Jungle
TV µPC
87 10
V-Chip
(Sub)
30
Misc
(main)
Preamp 20
Protect
AMDP 600 270 111
Sub
Decoder
75
SVM
Switch
(signal)
130 100
Tuner
(DM)
Tuner
(signal)
30 280
V-Defl.
2H
Enhance
200 60
Video
Chroma
140
Table 5-1: V19 Power Distribution Estimate (3.3V to 9V Supplies)