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TDA8954 Folha de dados(PDF) 11 Page - NXP Semiconductors

Nome de Peças TDA8954
Descrição Electrónicos  2 횞 210 W class-D power amplifier
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Fabricante Electrônico  PHILIPS [NXP Semiconductors]
Página de início  http://www.nxp.com
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TDA8954 Folha de dados(HTML) 11 Page - NXP Semiconductors

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TDA8954_1
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 01 — 24 December 2009
11 of 46
NXP Semiconductors
TDA8954
2
× 210 W class-D power amplifier
8.4.2 OverCurrent Protection (OCP)
In order to guarantee the robustness of the TDA8954, the maximum output current
delivered at the output stages is limited. OCP is built in for each output power switch.
OCP is activated when the current in one of the power transistors exceeds the OCP
threshold (IORM = 12 A) due, for example, to a short-circuit to a supply line or across the
load.
The TDA8954 amplifier distinguishes between low-ohmic short-circuit conditions and
other overcurrent conditions such as a dynamic impedance drop at the loudspeaker. The
impedance threshold (Zth) depends on the supply voltage.
How the amplifier reacts to a short circuit depends on the short-circuit impedance:
Short-circuit impedance > Zth: the amplifier limits the maximum output current to IORM
but the amplifier does not shut down the PWM outputs. Effectively, this results in a
clipped output signal across the load (behavior very similar to voltage clipping).
Short-circuit impedance < Zth: the amplifier limits the maximum output current to IORM
and at the same time discharges the capacitor on pin PROT. When CPROT is fully
discharged, the amplifier shuts down completely and an internal timer is started.
The value of the protection capacitor (CPROT) connected to pin PROT can be between
10 pF and 220 pF (typically 47 pF). While OCP is activated, an internal current source is
enabled that will discharge CPROT.
(1) Duty cycle of PWM output modulated according to the audio input signal.
(2) Duty cycle of PWM output reduced due to TFB.
(3) Amplifier is switched off due to OTP.
Fig 8.
Behavior of TFB, OTP and signal on pin DIAG1
30
24
0
1
2
3
VPULL-UP
VDIAG1
T
T
Gain
[dB]
010aaa562


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