50
AVR-4806 / AVC-A11XV
TC9274F-022 (IC120,406) AUDIO P.W.B.
TPS6734IDR (IC508) DIGITAL P.W.B.
1
2
3
4
8
7
6
5
EN
REF
SS
COMP
V
CC
FB
OUT
GND
functional block diagram
EN
1
EN
7
EN
FB
_
+
4
COMP
Voltage
Error
Amplifier
PWM
Comparator
R
S
170-kHz
Oscillator
VCC
Power Switch
Drive Latch
Σ
2
REF
x6
Current
Sense Amplifier
Overcurrent
Comparator
Driver
VCC
OUT
GND
8
6
5
+
–
Q
Terminal Functions
DESCRIPTION
NAME
NO.
DESCRIPTION
EN
1
Enable. EN
≥
2 V turns on the TPS6734. EN
≤
0.4 V turns it off and reduces the supply current to 3
μ
A max.
REF
2
1.22-V reference voltage output. REF can source 100
μ
A for external loads.
SS
3
Soft Start. A capacitor between SS and GND brings the output voltage up slowly at power-up.
COMP
4
Compensation connection. A 0.001-
μ
F 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.
VCC
8
Supply voltage input
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