Denon AVC-A11XV Service Manual page 50

QQ
3 7 63 1515 0
TC9274F-022 (IC120,406) AUDIO P.W.B.
TPS6734IDR (IC508) DIGITAL P.W.B.
EN
1 8
REF
2 7
SS
3 6
COMP
4
5
functional block diagram
1
EN
TE
L 13942296513
7
FB
4
COMP
2
REF
1 MΩ
3
SS
TERMINAL
NAME NO.
Enable. EN ≥ 2 V turns on the TPS6734. EN ≤ 0.4 V turns it off and reduces the supply current to 3 μA max.
EN 1
1.22-V reference voltage output. REF can source 100 μA for external loads.
REF 2
SS 3 Soft Start. A capacitor between SS and GND brings the output voltage up slowly at power-up.
www
COMP 4 Compensation connection. A 0.001-μF capacitor between COMP and FB stabilizes the feedback loop.
GND 5 Ground
OUT 6 N-channel MOSFET drain connection
.
FB 7 Feedback voltage. FB is connected to the converter output for the feedback loop.
V CC 8 Supply voltage input
http://www.xiaoyu163.com
V
CC
FB
OUT
GND
EN
EN
170-kHz
Oscillator
_
S
+ R
Error
Drive Latch
Amplifier PWM
Comparator
Voltage
Current
Reference
Sense Amplifier
x3.5
SS
Clamp
Overcurrent
Comparator
Terminal Functions
x ao
y
i
http://www.xiaoyu163.com
8
V CC
Q Q
3 6 7 1 3
Power Switch
Q
Driver
Σ
x6
+
–
DESCRIPTION DESCRIPTION
u163
.
50
AVR-4806 / AVC-A11XV
2 9 9 4 2 8
8
V CC
1 5 0 5 8 2 9 9 4
6
OUT
5
GND
m
co
9 9
2 8 9 9