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PDF TDA8922C Data sheet ( Hoja de datos )
| Número de pieza | TDA8922C | |
| Descripción | 2 x 75 W class-D power amplifier | |
| Fabricantes | NXP Semiconductors | |
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TDA8922C
2 × 75 W class-D power amplifier
Rev. 01 — 7 September 2009
Product data sheet
1. General description
The TDA8922C is a high-efficiency Class D audio power amplifier. Typical output power is
2 × 75 W with a speaker load impedance of 6 Ω.
The TDA8922C is available in both HSOP24 and DBS23P power packages. The amplifier
operates over a wide supply voltage range from ±12.5 V to ±32.5 V and features low
quiescent current consumption.
2. Features
I Pin compatible with TDA8950/20C for both HSOP24 and DBS23P packages
I Symmetrical operating supply voltage range from ±12.5 V to ±32.5 V
I Stereo full differential inputs, can be used as stereo Single-Ended (SE) or mono
Bridge-Tied Load (BTL) amplifier
I High output power in typical applications:
N SE 2 × 75 W, RL = 6 Ω (VDD = 30 V; VSS = −30 V)
N SE 2 × 60 W, RL = 8 Ω (VDD = 30 V; VSS = −30 V)
N BTL 1 × 155 W, RL = 8 Ω (VDD = 25 V; VSS = −25 V)
I Low noise
I Smooth pop noise-free start-up and switch off
I Zero dead time switching
I Fixed frequency
I Internal or external clock
I High efficiency
I Low quiescent current
I Advanced protection strategy: voltage protection and output current limiting
I Thermal FoldBack (TFB)
I Fixed gain of 30 dB in SE and 36 dB in BTL applications
I Fully short-circuit proof across load
I BD modulation in BTL configuration
3. Applications
I DVD
I Mini and micro receiver
I Home Theater In A Box (HTIAB) system
I High-power speaker system
1 page  
NXP Semiconductors
TDA8922C
2 × 75 W class-D power amplifier
7.2 Pin description
Table 3.
Symbol
VSSA
SGND
VDDA
IN2M
IN2P
MODE
OSC
IN1P
IN1M
n.c.
n.c.
n.c.
PROT
VDDP1
BOOT1
OUT1
VSSP1
STABI
n.c.
VSSP2
OUT2
BOOT2
VDDP2
VSSD
Pin description
Pin
TDA8922CTH TDA8922CJ
1 18
2 19
3 20
4 21
5 22
6 23
71
82
93
10 4
11 5
12 6
13 7
14 8
15 9
16 10
17 11
18 12
19 -
20 13
21 14
22 15
23 16
24 17
Description
negative analog supply voltage
signal ground
positive analog supply voltage
channel 2 negative audio input
channel 2 positive audio input
mode selection input: Standby, Mute or Operating
mode
oscillator frequency adjustment or tracking input
channel 1 positive audio input
channel 1 negative audio input
not connected
not connected
not connected
decoupling capacitor for protection (OCP)
channel 1 positive power supply voltage
channel 1 bootstrap capacitor
channel 1 PWM output
channel 1 negative power supply voltage
decoupling of internal stabilizer for logic supply
not connected
channel 2 negative power supply voltage
channel 2 PWM output
channel 2 bootstrap capacitor
channel 2 positive power supply voltage
negative digital supply voltage
8. Functional description
8.1 General
The TDA8922C 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.
TDA8922C_1
Product data sheet
Rev. 01 — 7 September 2009
© NXP B.V. 2009. All rights reserved.
5 of 40
5 Page 
NXP Semiconductors
TDA8922C
2 × 75 W class-D power amplifier
Start-up will be interrupted If a short-circuit is detected between one of the output
terminals and pin VDDP1/VDDP2 or VSSP1/VSSP2. The TDA8922C will wait until the
short-circuit to the supply lines has been removed before resuming start-up. The short
circuit will not generate large currents because the short-circuit check is carried out
before the power stages are enabled.
• When the amplifier is shut down completely because the OCP circuit has detected a
short circuit to one of the supply lines.
WP will be activated when the amplifier attempts to restart after 100 ms (see
Section 8.3.2). The amplifier will not start-up again until the short circuit to the supply
lines has been removed.
8.3.4 Supply voltage protection
If the supply voltage drops below the minimum supply voltage threshold, Vth(uvp), the UVP
circuit will be activated and the system will shut down. Once the supply voltage rises
above Vth(uvp) again, the system will restart after a delay of 100 ms.
If the supply voltage exceeds the maximum supply voltage threshold, Vth(ovp), the OVP
circuit will be activated and the power stages will be shut down. When the supply voltage
drops below Vth(ovp) again, the system will restart after a delay of 100 ms.
An additional UnBalance Protection (UBP) circuit compares the positive analog supply
voltage (on pin VDDA) with the negative analog supply voltage (on pin VSSA) and is
triggered if the voltage difference exceeds a factor of two (VDDA > 2 × |VSSA| OR |VSSA| >
2 × VDDA). When the supply voltage difference drops below the unbalance threshold,
Vth(ubp), the system restarts after 100 ms.
An overview of all protection circuits and their respective effects on the output signal is
provided in Table 5.
Table 5. Overview of TDA8922C protection circuits
Protection name Complete
shutdown
Restart directly
TFB[1]
N
N
OTP
Y
N
OCP
Y[2]
N[2]
WP N[3] Y
UVP
Y
N
OVP
Y
N
UBP
Y
N
Restart after
100 ms
N
Y
Y[2]
N
Y
Y
Y
Pin PROT
detection
N
N
Y
N
N
N
N
[1] Amplifier gain depends on the junction temperature and heatsink size.
[2] The amplifier shuts down completely only if the short-circuit impedance is below the impedance threshold
(Zth; see Section 8.3.2). In all other cases, current limiting results in a clipped output signal.
[3] Fault condition detected during any Standby-to-Mute transition or during a restart after OCP has been
activated (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.
TDA8922C_1
Product data sheet
Rev. 01 — 7 September 2009
© NXP B.V. 2009. All rights reserved.
11 of 40
11 Page | ||
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| PDF Descargar | [ Datasheet TDA8922C.PDF ] | |
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