Harman Kardon AVR 171/230, Service Manual

Page: 102 / 174

DB1230
Preliminary Datasheet DB1230P-02
19. Oct. 2011
3 of 19
PIN DESCRIPTION
PIN NO. SYMBOL DESCRIPTION
1 NC No Connection pin.
2 FB
Feedback pin.
External resistors are connected between OUT and GND to set the regulated
output voltage based on 0.8V reference.
3 VCC
Internal regulated output.
A decoupling capacitor should be close to this pin as possible
4 SS
External soft-start program pin.
An external capacitor should be connected to GND.
5 AGND Analog Signal Ground.
6 NC No Connection pin.
7 EN
Enable pin.
For automatic start-up, please leave it open and in case of on/off control, there
should be pull-down resistor.(10K~100Kohm)
8 PGND Power Ground.
9 PGND Power Ground.
10 SW
Switching Node.
An inductor, internal high-side and low-side power switches are connected
11 SW
Switching Node.
An inductor, internal high-side and low-side power switches are connected
12 BS
Bootstrap pin.
The bootstrap charge capacitor should be connected between BS and SW to
provide a supply to gate driver of high-side power switch.
13 IN Input power supply pin.
14 NC No Connection pin.
PIN CONFIGURATION
TOP VIEW
14-TSSOP-EP Package
Fig.4 DB1230 PIN configuration
Harman Kardon AVR 171 Service Manual
Page 102 of 174