TFA9815 NXP Semiconductors, TFA9815 Datasheet - Page 5

• Manufacturer Part Number: TFA9815
• Description: The TFA9815 is a 2-channel power comparator for high-efficiency class D audio amplifiersystems
• Manufacturer: NXP Semiconductors

NXP Semiconductors
8. Functional description
TFA9815_1
Preliminary data sheet
8.1 General
8.2 Interfacing
Table 3.
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
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.
The pins ENABLE and SO/OL control the Operating mode of the TFA9815. Both the
ENABLE and the SO/OL pins are referenced to V
When the SO/OL pin is connected to V
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.
Symbol
IN2P
V
V
STAB2
V
BOOT2N
OUT2N
BOOT2P
OUT2P
V
V
OUT1P
BOOT1P
OUT1N
BOOT1N
V
STAB1
V
SSD(HW)
SSD(HW)
SSP2
DDP2
DDP1
SSP1
SSD(HW)
Pin description
Pin
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
Rev. 01 — 16 December 2008
…continued
Description
positive input comparator channel 2
negative digital supply voltage and handle-wafer connection
negative digital supply voltage and handle-wafer connection
decoupling of internal 11 V regulator for channel 2 drivers
negative power supply voltage channel 2
bootstrap high-side driver negative output channel 2
negative output channel 2
bootstrap high-side driver positive output channel 2
positive output channel 2
positive power supply voltage channel 2
positive power supply voltage channel 1
positive output channel 1
bootstrap high-side driver positive output channel 1
negative output channel 1
bootstrap high-side driver negative output channel 1
negative power supply voltage channel 1
decoupling of internal 11 V regulator for channel 1 drivers
negative digital supply voltage and handle-wafer connection
Figure
SSD(HW)
1). By using this power comparator a compact
the TFA9815 is in self-oscillating
SSD(HW)
.
Audio amplifier 2 x 17 W
© NXP B.V. 2008. All rights reserved.
TFA9815
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