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PDF TDA8954TH Data sheet ( Hoja de datos )
| Número de pieza | TDA8954TH | |
| Descripción | 2 X 210 W class-D power amplifier | |
| Fabricantes | NXP Semiconductors | |
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TDA8954
2 × 210 W class-D power amplifier
Rev. 01 — 24 December 2009
Product data sheet
1. General description
The TDA8954 is a stereo or mono high-efficiency Class D audio power amplifier in a
single IC featuring low power dissipation. It is designed to deliver up to 2 × 210 W into a
4 Ω load in a stereo Single-Ended (SE) application, or 1 × 420 W into an 8 Ω load in a
mono Bridge-Tied Load (BTL) application.
It combines the benefits of Class D efficiency (≈93 % into a 4 Ω load) with audiophile
sound quality comparable to that associated with Class AB amplification.
The amplifier operates over a wide supply voltage range from ±12.5 V to ±42.5 V and
features low quiescent current consumption.
The TDA8954 is supplied with two diagnostic pins for monitoring the status of Thermal
Fold Back (TFB), Over Current Protection (OCP) and other protection circuits.
2. Features
High output power in typical applications:
SE 2 × 210 W, RL = 4 Ω (VDD = 41 V; VSS = −41 V)
SE 2 × 235 W, RL = 3 Ω (VDD = 39 V; VSS = −39 V)
SE 2 × 150 W, R = 6 Ω (V = 41 V; V = −41 V)www.DataSheet.net/
L DD
SS
BTL 1 × 420 W, RL = 8 Ω (VDD = 41 V; VSS = −41 V)
Symmetrical operating supply voltage range from ±12.5 V to ±42.5 V
Stereo full differential inputs, can be used as stereo SE or mono BTL amplifier
Low noise
Smooth pop noise-free start-up and switch off
2-pin diagnostics for protection circuits
Fixed frequency internal or external clock
High efficiency ≈93 %
Zero dead time switching
Low quiescent current
Advanced protection strategy: voltage protection and output current limiting
Thermal FoldBack (TFB) with disable functionality
Fixed gain of 30 dB in SE and 36 dB in BTL applications
Fully short-circuit proof across load
BD modulation in BTL configuration
Clock protection
Datasheet pdf - http://www.DataSheet4U.co.kr/
1 page  
NXP Semiconductors
TDA8954
2 × 210 W class-D power amplifier
7.2 Pin description
Table 3. Pin description
Symbol Pin
Description
TDA8954TH TDA8954J
VSSA
1
18 negative analog supply voltage
SGND
2
19 signal ground
VDDA
3
20 positive analog supply voltage
IN2M
4
21 channel 2 negative audio input
IN2P
5
22 channel 2 positive audio input
MODE 6
23 mode selection input: Standby, Mute or Operating
mode
OSC
7
1
oscillator frequency adjustment or tracking input
IN1P
8
2
channel 1 positive audio input
IN1M
9
3
channel 1 negative audio input
DIAG1 10
4
diagnostic output 1 (open drain; TFB)
OSCREF 11
5
reference for OSC pin
DIAG2 12
6
diagnostic output 2 (open drain; protection functions)
PROT
13
7
decoupling capacitor for protection (OCP)
VDDP1 14
8
channel 1 positive power supply voltage
BOOT1 15
9
channel 1 bootstrap capacitor
OUT1
VSSP1
16
17
10 channel 1 PWM output
www.DataSheet.net/
11 channel 1 negative power supply voltage
STABI
18
12
decoupling of internal stabilizer for logic supply
n.c. 19 17 not connected
VSSP2 20 13 channel 2 negative power supply voltage
OUT2
21
14
channel 2 PWM output
BOOT2 22 15 channel 2 bootstrap capacitor
VDDP2 23 16 channel 2 positive power supply voltage
VSSA
24
-
negative analog supply voltage
8. Functional description
8.1 General
The TDA8954 is a two-channel audio power amplifier that uses Class D technology.
For each channel, the audio input signal is converted into a digital Pulse Width Modulation
(PWM) signal using an analog input stage and a PWM modulator; see Figure 1. To drive
the output power transistors, the digital PWM signal is fed to a control and handshake
block and to high- and low-side driver circuits. This level-shifts the low-power digital PWM
signal from a logic level to a high-power PWM signal switching between the main supply
lines.
A second-order low-pass filter converts the PWM signal to an analog audio signal that can
be used to drive a loudspeaker.
TDA8954_1
Product data sheet
Rev. 01 — 24 December 2009
© NXP B.V. 2009. All rights reserved.
5 of 46
Datasheet pdf - http://www.DataSheet4U.co.kr/
5 Page 
NXP Semiconductors
VPULL-UP
VDIAG1
T
30
Gain
[dB]
24
0
T
TDA8954
2 × 210 W class-D power amplifier
1 23
010aaa562
(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
www.DataSheet.net/
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.
TDA8954_1
Product data sheet
Rev. 01 — 24 December 2009
© NXP B.V. 2009. All rights reserved.
11 of 46
Datasheet pdf - http://www.DataSheet4U.co.kr/
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