SA58631 Datasheet, PDF (4/21 Pages) NXP Semiconductors – 3 W BTL audio amplifier

NXP Semiconductors
SA58631
3 W BTL audio amplifier
7.2 Pin description
Table 3.
Symbol
MODE
SVR
IN+
IN−
OUT−
V_CC
GND
OUT+
Pin description
Pin
1
2
3
4
5
6
7
8
Description
operating mode select (standby, mute, operating)
half supply voltage, decoupling ripple rejection
positive input
negative input
negative output terminal
supply voltage
ground
positive output terminal
8. Functional description
The SA58631 is a single-channel BTL audio amplifier capable of delivering 3 W output
power to an 8 Ω load at THD+N = 10 % using a 9 V power supply. Using the MODE pin,
the device can be switched to standby and mute condition. The device is protected by an
internal thermal shutdown protection mechanism. The gain can be set within a range of
6 dB to 30 dB by external feedback resistors.
8.1 Power amplifier
The power amplifier is a Bridge Tied Load (BTL) amplifier with a complementary
PNP-NPN output stage. The voltage loss on the positive supply line is the saturation
voltage of a PNP power transistor, on the negative side the saturation voltage of an NPN
power transistor. The total voltage loss is < 1 V. With a supply voltage of 9 V and an 8 Ω
loudspeaker, an output power of 3 W can be delivered to the load.
8.2 Mode select pin (MODE)
The device is in Standby mode (with a very low current consumption) if the voltage at the
MODE pin is greater than V_CC − 0.5 V, or if this pin is floating. At a MODE voltage in the
range between 1.5 V and V_CC − 1.5 V the amplifier is in a mute condition. The mute
condition is useful to suppress plop noise at the output, caused by charging of the input
capacitor.
SA58631_2
Product data sheet
Rev. 02 — 12 October 2007
© NXP B.V. 2007. All rights reserved.
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