SA58632 datasheet(5/26 Pages) PHILIPS

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SA58632_1

Product data sheet

Rev. 01 — 27 June 2006

5 of 26

Philips Semiconductors

SA58632

× 2.2 W BTL audio ampliﬁer

Functional description

The SA58632 is a two-channel BTL audio ampliﬁer capable of delivering 2

× 1.5 W output

power to an 8

Ω load at THD+N = 10 % using a 6 V power supply. It is also capable of

delivering 2

× 2.2 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 6 V and an 8

Ω

loudspeaker, an output power of 1.5 W can be delivered to the load, and with a 9 V supply

voltage and an 8

Ω loudspeaker an output power of 2.2 W can be delivered.

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 VCC − 0.5 V, or if this pin is ﬂoating. At a MODE voltage in the

range between 1.5 V and VCC − 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. The device is in Active mode if the MODE pin is grounded or less than 0.5 V

(see Figure 6).

8.3 BTL/SE output conﬁguration

To invoke the BTL conﬁguration (see Figure 3), the BTL/SE pin is taken to logic HIGH or

not connected. The output differentially drives the speakers, so there is no need for

coupling capacitors. The headphone can be connected to the ampliﬁer negative outputs

using a coupling capacitor for each channel. The headphone common ground is

connected to the ampliﬁer ground.

To invoke the Single-Ended (SE) conﬁguration (see Figure 15), the BTL/SE pin is taken to

logic LOW or connected to ground. The positive outputs are muted with a DC level of

0.5VCC. Using a coupling capacitor for each channel, speakers can be connected to the

ampliﬁer negative outputs. The speaker common ground is connected to the ampliﬁer

ground. Headphones can be connected to the negative outputs without using output

coupling capacitors. The headphone common ground pin is connected to one of the

ampliﬁer positive output pins.

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