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TFA9810T/N1,112

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P29
TFA9810_3 © NXP B.V. 2008. All rights reserved.
Product data sheet Rev. 03 — 20 February 2008 4 of 29
NXP Semiconductors
TFA9810
Audio amplifier 2 x 12 W
7. Pinning information
7.1 Pinning
The SO32 package has four corner leads. These leads (1, 16, 17, and 32) are internally
connected to the die pad and must be connected to V
SSA
in the application. Together with
the applied copper area on the Printed Circuit Board (PCB) these leads determine the
ambient temperature, which affects the thermal resistance of the junction.
7.2 Pin description
Fig 2. Pin configuration
TFA9810
SO32
V
SSD(HW)
V
SSD(HW)
IN1P STAB1
IN1N V
SSP1
V
DDA1
BOOT1N
V
SSA1
OUT1N
SO/OL BOOT1P
ENABLE OUT1P
CDELAY V
DDP1
n.c. V
DDP2
DIAG OUT2P
TEST BOOT2P
V
SSA2
OUT2N
V
DDA2
BOOT2N
IN2N V
SSP2
IN2P STAB2
V
SSD(HW)
V
SSD(HW
)
010aaa017
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
18
17
20
19
22
21
24
23
26
25
32
31
30
29
28
27
Table 3. Pin description
Symbol Pin Description
V
SSD(HW)
1, 16, 17,
32
Negative digital supply voltage and handle wafer
IN1P 2 Positive input comparator channel 1
IN1N 3 Negative input comparator channel 1
V
DDA1
4 Positive analog supply voltage channel 1
V
SSA1
5 Negative analog supply voltage channel 1
SO/OL 6 SO/OL input enables self-oscillating / open-loop configuration
ENABLE 7 Enable input to switch between SLEEP and OPERATING
CDELAY 8 CDELAY input determines the switch on/off timing
n.c. 9 Not connected
DIAG 10 Diagnostic output; open drain
TEST 11 Test signal input; for testing purposes only
V
SSA2
12 Negative analog supply voltage channel 2
V
DDA2
13 Positive analog supply voltage channel 2
TFA9810_3 © NXP B.V. 2008. All rights reserved.
Product data sheet Rev. 03 — 20 February 2008 5 of 29
NXP Semiconductors
TFA9810
Audio amplifier 2 x 12 W
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 V
SSD(HW)
.
When the SO/OL pin is connected to V
SSA
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 V
DDA
in both situations.
The device has two modes: SLEEP and OPERATING.
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
V
SSP2
19 Negative power-supply voltage channel 2
BOOT2N 20 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
V
DDP2
24 Positive supply voltage power channel 2
V
DDP1
25 Positive power supply voltage channel 1
OUT1P 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
V
SSP1
30 Negative supply voltage power channel 1
STAB1 31 Decoupling of internal 11 V regulator for channel 1 drivers
Table 3. Pin description
…continued
Symbol Pin Description
Table 4. SO/OL connections
Interfacing
SO/OL connected to Configuration
V
SSD(HW)
Self-oscillating
Open Open-loop
TFA9810_3 © NXP B.V. 2008. All rights reserved.
Product data sheet Rev. 03 — 20 February 2008 6 of 29
NXP Semiconductors
TFA9810
Audio amplifier 2 x 12 W
In SLEEP mode the TFA9810 is not biased and has a very low supply current.
When the TFA9810 is set to OPERATING mode the device is started via the start-up
sequence, which provides a pop-free start-up behavior. After start-up the reference
voltages STAB are present and the outputs start switching.
8.3 Input comparators
The input stages have a differential input and are optimized for low noise and low offset.
This results in maximum flexibility in the application.
8.3.1 Operating in self-oscillating configuration
The inputs (IN1P, IN1N, IN2P, IN2N) of the comparators are internally set to a voltage level
of 0.5V
P
, but only during the start-up sequence. In operating mode the inputs are
high-ohmic.
8.3.2 Operating in open-loop configuration
No internal voltages are applied to the inputs. The input pins (IN1P, IN1N, IN2P, IN2N) are
pulled down to V
SSA
level by internal resistors.
8.4 Diagnostic
The DIAG output is an open-drain output. The maximum current is 2 mA. Whenever one
of the protections is triggered the DIAG output is activated low. The DIAG output refers to
V
SSD
.
8.5 Protections
Overtemperature, overcurrent, overvoltage, undervoltage, overdissipation sensors, and
window protection are included in the TFA9810. When one of these sensors exceeds its
threshold level either the output power stage is switched off and the outputs (OUT1N,
OUT1P, OUT2N, OUT2P) become floating, or the TFA9810 shuts down and starts up
immediately.
• OverTemperature Protection (OTP)
If the junction temperature (T
j
) exceeds a threshold level of about 150 °C then the
outputs become floating. The device will start switching again after 5 µs and when the
temperature is below 150 °C. This is thermal limitation without audible interruptions.
• OverCurrent Protection (OCP)
If the output current exceeds the maximum output current threshold level the output
becomes floating. The device will start switching again after 5 µs. This is current
limitation without audible interruptions.
Table 5. Start-up
Interfacing
ENABLE [V] Mode
ENABLE < 0.8 V SLEEP
ENABLE > 3 V OPERATING
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TFA9810T/N1,112

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Manufacturer:
NXP Semiconductors
Description:
Audio Amplifiers 2X15W BTL POWER
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