TFA9812HN PHILIPS [NXP Semiconductors], TFA9812HN Datasheet - Page 23

• Manufacturer Part Number: TFA9812HN
• Description: BTL stereo Class-D audio amplifier with I2S input
• Manufacturer: PHILIPS [NXP Semiconductors]

NXP Semiconductors
TFA9812_2
Preliminary data sheet
8.6 Class-D amplification
8.7 Protection mechanisms
The selected PWM switching frequency is 400 kHz by default and can be set to 350 kHz,
700 kHz and 750 kHz in I
this scales linearly if 32 kHz or 48 kHz is used as f
Remark: The selected sample frequency, f
frequency (f
Remark: The performance of AM radio reception can sometimes be improved by
selecting non-interfering frequencies for the PWM signal.
The Class-D power amplification of the PWM signal is carried out in two BTL power
stages. The output signal voltage level is determined by the values on the V
The power amplifiers can be explicitly put into 3-state mode by using the pin ENABLE as
shown in
Table 19.
[1]
The TFA9812 has a wide range of protection mechanisms to facilitate optimal and safe
application. All of these are active in both I
The following protections are included in the TFA9812:
The reaction of the device to the different fault conditions differs per protection.
ENABLE pin value
0
1
•
•
•
•
•
•
•
•
•
•
•
•
Can be overruled by a forced 3-state in Sleep or Fault mode.
Thermal Foldback (TF)
OverTemperature Protection (OTP)
OverCurrent Protection (OCP)
OverVoltage Protection (OVP)
UnderVoltage Protection (UVP)
Window Protection (WP)
Lock Protection (LP)
UnderFrequency Protection (UFP)
OverFrequency Protection (OFP)
Invalid BCK Protection (IBP)
DC-blocking
ESD
Table
ENABLE pin functionality
s
) in I
19. The ENABLE pin is functional in Legacy mode and in I
2
C control mode.
Rev. 02 — 22 January 2009
2
C control mode. In Legacy mode 400 kHz is the only option and
BTL stereo Class-D audio amplifier with I
2
s
C and Legacy control modes.
(selected) must be equal to the sample
Function
Output stages in 3-state mode.
Switching enabled
s
.
[1]
.
© NXP B.V. 2009. All rights reserved.
TFA9812
2
C mode.
DDP
pins.
2
S input
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