Denon S-301 Service Manual page 79

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