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PDF TDA8953 Data sheet ( Hoja de datos )
| Número de pieza | TDA8953 | |
| Descripción | 2 X 210 W class-D power amplifier | |
| Fabricantes | NXP Semiconductors | |
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TDA8953
2 × 210 W class-D power amplifier
Rev. 01 — 24 December 2009
Product data sheet
1. General description
The TDA8953 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.
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, RL = 6 Ω (VDD = 41 V; VSS = −41 V)
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
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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
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
TDA8953
2 × 210 W class-D power amplifier
7.2 Pin description
Table 3. Pin description
Symbol Pin
Description
TDA8953TH TDA8953J
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
n.c. 10
4
not connected
OSCREF 11
5
reference for OSC pin
n.c. 12
6
not connected
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
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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 TDA8953 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.
TDA8953_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
TDA8953
2 × 210 W class-D power amplifier
After a fixed period of 100 ms, the amplifier will attempt to switch on again, but will fail if
the output current still exceeds the OCP threshold. The amplifier will continue trying to
switch on every 100 ms. The average power dissipation will be low in this situation
because the duty cycle is short.
Switching the amplifier on and off in this way will generate unwanted ‘audio holes’. This
can be avoided by increasing the value of CPROT (up to 220 pF) to delay amplifier
switch-off. CPROT will also prevent the amplifier switching off due to transient
frequency-dependent impedance drops at the speakers.
The amplifier will switch on, and remain in Operating mode, once the overcurrent
condition has been removed. OCP ensures the TDA8953 amplifier is fully protected
against short-circuit conditions while avoiding audio holes.
Table 4. Current limiting behavior during low output impedance conditions at different
values of CPROT
Type
VDD/VSS (V)
VI (mV, p-p) f (Hz) CPROT
(pF)
PWM output stops
Short
Short
(Zth = 0 Ω) (Zth = 0.5 Ω)
Short
(Zth = 1 Ω)
TDA8953 +41/−41
500
20 10
yes[1]
yes[1]
yes[1]
1000 10 yes
no
no
20 15
yes[1]
yes[1]
yes[1]
1000 15 yes
no
no
1000 220 no
no
no
[1] OVP can be triggered by supply pumping; see Section 14.6.
www.DataSheet.net/
When a short circuit occurs between the load and the supply voltage, the current will
increase rapidly to IORM, when current limiting will be activated. If the short circuit
condition persists long enough, the OCP circuit will shut down the amplifier. After the short
circuit has been removed, the amplifier will resume normal operations (see Figure 9).
IMAX
current
limiting
IOUT
short to VDDP applied
Fig 9. Current limiting
switch off amplifier
short
circuit
protection
t 010aaa621
8.3.3 Window Protection (WP)
Window Protection (WP) checks the conditions at the output terminals of the power stage
and is activated:
• During the start-up sequence, when the TDA8953 is switching from Standby to Mute.
TDA8953_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/
11 Page | ||
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