AN10436 PHILIPS [NXP Semiconductors], AN10436 Datasheet - Page 10

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

NXP Semiconductors
AN10436_1
Application note
2.1.1 Mode description
enabled. The DIAG pin is an I/O indicating FAULT mode and it can be used to switch the
amplifier in FAULT mode by means of an external pull-down to CGND. The DIAG has an
internal pull-up current source.
Table 1.
[1]
[2]
See
DIAG.
Remark: Do not use an external pull-up resistor at the ENGAGE input, as it has its own
internal pull-up current source.
Mode
1) SLEEP
2) MUTE
3) OPERATING
4) FAULT
•
•
•
•
ENGAGE open pin voltage is 2.8 V in OPERATING mode.
DIAG open pin voltage is 2.5 V in MUTE and OPERATING mode.
SLEEP mode:
The SLEEP mode is incorporated to reduce the power consumption in system idle
mode. In SLEEP mode, the internal 5 V stabilizer (DREF), the 11 V stabilizers
(STAB1, STAB2) and the half supply voltage buffers (HVPREF, HVP1, HVP2) are
disabled to reduce supply current consumption.
MUTE mode:
In MUTE mode, the 5 V (DREF) and the 11 V (STAB1, STAB2) stabilizers will be
enabled (internal logic biased) and the half supply voltage buffers will charge
respectively the reference decouple capacitor (C
capacitors (C
switching) after the SE capacitors are charged completely.
OPERATING mode:
In the OPERATING mode, the gain of the device is increased gradually to 30 dB per
output stage to avoid pop noise. The complete start-up sequence will take about
500 ms in a typical SE application.
FAULT mode:
The FAULT mode is entered when one of the internal protections is triggered (see
Section
current source of the ENGAGE pin is disabled in FAULT mode. Therefore, the
external capacitor will be discharged by means of the internal pull-down resistor.
The FAULT mode can be entered also by means of an external pull-down to CGND.
Table 2
Section 3.3
Control voltages referenced to CGND
shows an overview of the internal protections.
2.6) and as a consequence the DIAG (pin 4) is set to low. The internal pull-up
for the recommended control circuitry of the POWERUP, ENGAGE and
SE
) in series with the speaker. The power stage is enabled (starts
Rev. 01 — 12 December 2007
V
< 0.8
> 2
> 2
> 2
POWERUP
(V)
V
< 0.8
< 0.8
> 2.4
Does not matter
TDA8932B/33(B) Class-D audio amplifier
ENGAGE
[1]
HVPREF
(V)
) and the AC-couple
V
Does not matter
> 2
> 2
< 0.8
DIAG
AN10436
[2]
[2]
© NXP B.V. 2007. All rights reserved.
(V)
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