SA1469TN
Pin No.
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
Symbol
OUT2A
GND
OPOUT
OPIN (-)
OPIN (+)
OUT3A
OUT3B
IN3A
IN3B
V
CC
V
CC
V
REF
IN4B
IN4A
OUT4B
OUT4A
GND
I/O
O
--
O
I
I
O
O
I
I
--
--
I
I
I
O
O
--
Drive output
Ground
Opamp output
Opamp input (-)
Opamp input (+)
Drive output
Drive output
Drive input
Drive input
Supply voltage
Supply voltage
2.5V bias voltage
Drive input
Drive input
Drive output
Drive output
Ground
Description
FUNCTIONAL DESCRIPTION
1. MUTE
Function
Thermal shutdown
External muting
V
REF
muting
Mute
○
○
○
T≥175°C
V(mute)≤ 1.4V
Or open
PIN23 < 0.7V
Operation conditions
1)
The circuit is muted during thermal shutdown and during the mute-on state.In each case, only the drivers are
muted.
2)
3)
4)
5)
6)
During mute, the output pins remain at the internal bias voltage, roughly (Vcc-Vf)/2.
When the mute pin # 7 is open or the voltage of the mute pin # 7 is below 0.5V, the mute circuit is activated
so that the output circuit will be muted..
When the voltage of the mute pin is above 2V, the mute circuit is stopped and the output circuit is operated
normally.
If the chip temperature rises above 175°C, then the TSD (Thermal Shutdown) circuit is activated and the
output circuit is muted.
When the voltage of PIN23<0.7V ,the output circuit will be muted.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:1.2
2008.07.23
Page 4 of 11
SILAN [ SILAN MICROELECTRONICS JOINT-STOCK ]
