TDA8920C Datasheet, PDF (11/40 Pages) NXP Semiconductors – 2 X110 W class-D power amplifier

NXP Semiconductors
TDA8920C
2 × 110 W class-D power amplifier
Table 4. Overview of TDA8920C protection strategies
Protection name Complete
shutdown
Restart directly Restart after
100 ms
TFB^[1]
N
N
N
OTP
Y
N
Y
OCP
Y^[2]
N^[2]
Y^[2]
WP
N^[3]
Y
N
UVP
Y
N
Y
OVP
Y
N
Y
UBP
Y
N
Y
Pin PROT
detection
N
N
Y
N
N
N
N
[1] Amplifier gain depends on the junction temperature and heatsink size.
[2] Only complete shutdown of the amplifier if short-circuit impedance is below the threshold of 1 Ω. In all other
cases current limiting results in a clipped output signal.
[3] Fault condition detected during (every) transition between standby-to-mute and during a restart after
activation of OCP (short-circuit to one of the supply lines).
8.4 Differential audio inputs
The audio inputs are fully differential ensuring a high common mode rejection ratio and
maximum flexibility in the application.
• Stereo operation: it is advised to use the inputs in anti-phase and connect the
speakers in anti-phase, to avoid acoustical phase differences. The construction
advantages are:
– minimized power supply peak current
– minimized supply pumping effect, especially at low audio frequencies
• Mono BTL operation: it is required that the inputs are connected in anti-parallel. The
output of one channel is inverted and the speaker load is connected between the two
outputs of the TDA8920C. In principle, the output power to the speaker can be
boosted to twice the output power of single-ended stereo.
The input configuration for a mono BTL application is illustrated in Figure 7.
IN1P
IN1M
V_in
IN2P
IN2M
OUT1
SGND
OUT2
Fig 7.
power stage
mbl466
Input configuration for mono BTL application
TDA8920C_1
Preliminary data sheet
Rev. 01 — 29 September 2008
© NXP B.V. 2008. All rights reserved.
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