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2.1.6 BDRV and Step-up CKT
The "BDRV" signal from TDA4854 pin6 is a square waveform. It is inverted and amplified by Q201. Q310
and Q311 constitute a buffer stage.
Q312, L301, D318, C323 is step-up circuit B+ = 45 * ( ton + toff ) / toff.
B+
2-4
+6.5V
R242
(OPEN)
ZD203
4.3V
D203
(OPEN)
D204
(OPEN)
BRITE
R243
1.1K
1%
G1
-190V
Fig5 Brite & Spotkiller circuit
470P
470P
51
500V
500V
(D)
(D)
1/4W
R333
C337
C334
BYM26A
D318
+
C323
33U
Q312
250V
IRF630
(EL)
R371
L306
3.3
BEAD
1/4W
Fig 6 BDRV & Step-up circuit
No Copy/Reproduction Allowed
+48V
R231
100
R232
1/4W
5.6K
R254
1W
4.7K
D209
R255
1N4148
2.2K
R240
2.87K
(1%)
Q202
C224
H945
0.22U
R239
250V
Q203
6.8K
BF423
(MPE)
R241
100K
1/2W
R253
3M
1/4W
+45V
C322
0.01U
500V
(D)
+12V
L301
2mH
Q310
19.60058.001
H945
R370
47
D317
Q311
1N4148
A733
API Confidential
CLAMP
D210
BLANK
1N4148
C223
0.01U
50V
(D)
PWM
7277e Monitor Service Guide
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