Denon S-301 Service Manual page 79

QQ
3 7 63 1515 0
BD9781HFP (IC810: 1U-3695)
B D 9 7 8 1 H V F P
1 2
BD9002HFP (IC811: 1U-3695)
TE
L 13942296513
B D 9 0 0 2 H V F P
1 2
SN74LVC1G373 (IC111: 1U-3693)
LE 1 6
GND 2 5
D 3 4
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3 4 5 6 7
3 4 5 6 7
logic diagram (positive logic)
6
OE
OE
V
CC
1
LE
Q
3
D
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y
i
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8
5~35V
V
IN
1
1μF
220μF
Vref
SOFT
START
24KΩ
ERROR AMP
INV
6
10KΩ
150KΩ
Vref
4700μF
OSC
5
FB
RT
3
390KΩ
0.1μF
1
V
IN
Q Q
3 6 7 1 3
Vref
ERROR AMP PWM
3 COMPARATOR
INV
RESET
Vref
OSC
6
SS
5
FB
RT
7
C
D
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.
79
2 9 9 4 2 8
EN/SYNC
7
ON/OFF
L:OFF
H:ON
SYNC
PWM
COMPARATOR
DRIVER
LATCH
SW
2
RESET
TSD
V
IN
CURRENT LIMIT 4
GND
UVLO
1 5 0 5 8 2 9 9 4
DRIVER
LATCH
2 SW
TSD
V
IN
CURRENT LIMIT
4
GND
4
m
Q
co
S-301
9 9
33μH
VO
330μF
2 8 9 9