AN10436 PHILIPS [NXP Semiconductors], AN10436 Datasheet - Page 24

• Manufacturer Part Number: AN10436
• Description: TDA8932B/33(B) Class-D audio amplifier
• Manufacturer: PHILIPS [NXP Semiconductors]

NXP Semiconductors
AN10436_1
Application note
Fig 19. Sleep control push-pull output
PUSH-PULL OUTPUT
3.3 V or 5 V
OPERATING
Figure 19
from a 3.3 V or 5 V logic supply by means of a micro controller.
Remark: Pull-up resistor should be ≥ 1 kΩ.
An external capacitor of 470 nF is recommended at the ENGAGE pin. The switch in series
with the internal pull-up current source will be closed after the power stage is enabled and
finally the external capacitor will “softly” engage the amplifier. Softly means that the gain is
gradually increased depending on the capacitor value (dV/dt) attached to the ENGAGE
pin avoiding pop noise due to DC offset.
Fig 18. POWERUP circuit with optional sleep control
Fig 21. Engage circuit with optional mute control
SLEEP
10 k
and
OPERATING
OPTIONAL CIRCUIT FOR MUTE CONTROL
7
6
Figure 20
OPTIONAL CIRCUIT FOR SLEEP CONTROL
OPERATING
POWERUP
CGND
SLEEP
Rev. 01 — 12 December 2007
010aaa007
show two alternative POWERUP circuits to control SLEEP mode
SLEEP
GND
Fig 20. Sleep control open-drain output
GND
OPEN-DRAIN OUTPUT
10 k
TDA8932B/33(B) Class-D audio amplifier
10 V .. 36 V
470 nF
OPERATING
3.3 V or 5 V
47 k
12 k
5
7
CGND
ENGAGE
8
6
7
10 k
SLEEP
V
POWERUP
CGND
DDA
100 k
2 k
010aaa006
AN10436
7
6
2.8 V
© NXP B.V. 2007. All rights reserved.
POWERUP
CGND
010aaa009
50 A
010aaa008
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