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PDF TFA9810 Data sheet ( Hoja de datos )
| Número de pieza | TFA9810 | |
| Descripción | Stereo full-bridge audio amplifier | |
| Fabricantes | NXP Semiconductors | |
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TFA9810
Stereo full-bridge audio amplifier 2 x 12 W
Rev. 03 — 20 February 2008
Product data sheet
1. General description
The TFA9810 is a two-channel power comparator for high-efficiency class D audio
amplifier systems. It contains two full-bridge Bridge-Tied Load (BTL) power stages, drive
logic, protection control logic and full differential input comparators. By using this power
comparator a compact closed-loop self-oscillating digital amplifier system or open-loop
system can be built. The TFA9810 does not require a heat sink and operates using an
asymmetrical supply voltage.
2. Features
I Stereo full-bridge power comparator for class D audio amplifier applications
I No external heat sink required
I Operating voltage range: asymmetrical from 8 V to 20 V
I Thermally protected
I Zero dead-time switching
I Current-limiting (no audible interruptions)
3. Applications
I Self-oscillating or open-loop class D audio amplifier applications
I Flat-panel television sets
I Flat-panel monitors
I Multimedia systems
I Wireless speakers
I High-end CRT television sets
4. Quick reference data
Table 1. Quick reference data
Tamb = 25 °C; VP = 12 V; fosc = 550 kHz; Figure 33 unless otherwise specified
Symbol
Parameter
Condition
Min Typ
VP
supply voltage
VP = VDDPx − VSSPx
8 12
Ioff
off-state current
off mode
- 110
Iq quiescent current with load, filter and - 35
snubbers connected
ηpo
output power
output power
efficiency
2 x 9 W into 8 Ω;
Po = Po(nom)
87 89
Max Unit
20 V
200 µA
45 mA
-%
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NXP Semiconductors
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TFA9810
Audio amplifier 2 x 12 W
Table 3. Pin description …continued
Symbol
Pin Description
IN2N
14 Negative input comparator channel 2
IN2P
15 Positive input comparator channel 2
STAB2
18 Decoupling of internal 11 V regulator for channel 2 drivers
VSSP2
BOOT2N
19
20
Negative power-supply voltage channel 2
Bootstrap high-side driver negative output channel 2
OUT2N
21 Negative output channel 2
BOOT2P 22 Bootstrap high-side driver positive output channel 2
OUT2P
23 Positive output channel 2
VDDP2
VDDP1
OUT1P
24 Positive supply voltage power channel 2
25 Positive power supply voltage channel 1
26 Positive output channel 1
BOOT1P 27 Bootstrap high-side driver positive output channel 1
OUT1N
28 Negative output channel 1
BOOT1N
29
Bootstrap high-side driver negative output channel 1
VSSP1
STAB1
30 Negative supply voltage power channel 1
31 Decoupling of internal 11 V regulator for channel 1 drivers
8. Functional description
8.1 General
The TFA9810 is a dual-switching power comparator. It is the main building block for a
stereo high-efficiency Class D audio power amplifier system. It contains two full-bridge
BTL power stages, drive logic, protection-control logic and full differential input
comparators and references (see Figure 1). By using this power comparator a compact
closed-loop self-oscillating digital amplifier system or open-loop system can be built. A
second-order low-pass filter converts the Pulse Width Modulation (PWM) output signal
into an analog audio signal across the speaker.
8.2 Interfacing
The pins ENABLE and SO/OL control the operating mode of the TFA9810. Both the
ENABLE and the SO/OL pins refer to VSSD(HW).
When the SO/OL pin is connected to VSSA the TFA9810 is in self-oscillating mode: when
the SO/OL pin is floating the TFA9810 is in open-loop mode.
The TEST pin needs to be connected to VDDA in both situations.
Table 4. SO/OL connections
Interfacing
SO/OL connected to
VSSD(HW)
Open
Configuration
Self-oscillating
Open-loop
The device has two modes: SLEEP and OPERATING.
TFA9810_3
Product data sheet
Rev. 03 — 20 February 2008
© NXP B.V. 2008. All rights reserved.
5 of 29
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NXP Semiconductors
www.DataSheet4U.com
VDDA1
11 13 kΩ
TFA9810
Audio amplifier 2 x 12 W
Fig 11. Internal circuitry 0008
VSSA1
010aaa031
Fig 12. Internal circuitry 0009
14
15
Fig 13. Internal circuitry 0010
130 kΩ
VDDA2
5.5 V
hvp VSSA2
130 kΩ
5.5 V
VSSA2
010aaa033
TFA9810_3
Product data sheet
VDDA2
100 mA
18
12 V
Fig 14. Internal circuitry 0011
VSSD
010aaa034
Rev. 03 — 20 February 2008
© NXP B.V. 2008. All rights reserved.
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