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PDF TFA9815 Data sheet ( Hoja de datos )

Número de pieza TFA9815
Descripción Stereo full-bridge audio amplifier
Fabricantes NXP Semiconductors 
Logotipo NXP Semiconductors Logotipo



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No Preview Available ! TFA9815 Hoja de datos, Descripción, Manual

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TFA9815
Stereo full-bridge audio amplifier 2 x 17 W
Rev. 01 — 16 December 2008
Preliminary data sheet
1. General description
The TFA9815 is a 2-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 audio amplifier system or
open-loop system can be built. The continuous output power is 2 ×17 W in a full-bridge
BTL application. The TFA9815 does not require a heat sink and operates using an
asymmetrical supply voltage.
2. Features
I Stereo full-bridge audio amplifier for class D 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
VP = 12 V; fosc = 550 kHz; Tamb = 25 °C; typical application diagram Figure 12, unless otherwise
specified.
Symbol Parameter
Conditions
Min Typ Max Unit
General
VP supply voltage single, asymmetrical
supply (VDD - VSS)
IP supply current Sleep mode
8 12 20 V
- 110 200 µA

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TFA9815 pdf
NXP Semiconductors
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TFA9815
Audio amplifier 2 x 17 W
Table 3. Pin description …continued
Symbol
Pin Description
IN2P
15 positive input comparator channel 2
VSSD(HW) 16 negative digital supply voltage and handle-wafer connection
VSSD(HW) 17 negative digital supply voltage and handle-wafer connection
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 power supply voltage 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 power supply voltage channel 1
31 decoupling of internal 11 V regulator for channel 1 drivers
VSSD(HW) 32 negative digital supply voltage and handle-wafer connection
8. Functional description
8.1 General
The TFA9815 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 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 TFA9815. Both the
ENABLE and the SO/OL pins are referenced to VSSD(HW).
When the SO/OL pin is connected to VSSD(HW) the TFA9815 is in self-oscillating
configuration: when the SO/OL pin is floating the TFA9815 is in open-loop configuration.
Under this latter condition the open-pin voltage is typically 4 V applied internally. The
TEST pin needs to be connected to ground in both situations.
TFA9815_1
Preliminary data sheet
Rev. 01 — 16 December 2008
© NXP B.V. 2008. All rights reserved.
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TFA9815 arduino
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TFA9815
Audio amplifier 2 x 17 W
Table 7.
Pin
18
31
Internal circuitry …continued
Symbol
Equivalent circuit
STAB2
STAB1
VDDA1, VDDA2
18, 31
12 V
50 mA
19 VSSP2
24 VDDP2
25 VDDP1
30 VSSP1
20 BOOT2N
29 BOOT1N
VSSD
010aaa445
24, 25
19, 30
23.5 V
010aaa446
20, 29
12 V
21 OUT2N
23 OUT2P
26 OUT1P
28 OUT1N
OUT2N, OUT1N
010aaa447
VDDP1, VDDP2
21, 23, 26, 28
22 BOOT2P
27 BOOT1P
VSSP1, VSSP2
010aaa380
22, 27
12 V
OUT2P
010aaa448
TFA9815_1
Preliminary data sheet
Rev. 01 — 16 December 2008
© NXP B.V. 2008. All rights reserved.
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