參數(shù)資料
型號(hào)： TFA9812HN/N1,557
廠商： NXP SEMICONDUCTORS
元件分類(lèi)： 音頻／視頻放大
英文描述： 15 W, 2 CHANNEL, AUDIO AMPLIFIER, PQCC48
封裝： 7 X 7 MM, 0.85 MM HEIGHT, PLASTIC, MO-220, SOT619-8, HVQFN-48
文件頁(yè)數(shù)： 16/66頁(yè)
文件大小： 386K
代理商： TFA9812HN/N1,557
TFA9812_2
NXP B.V. 2009. All rights reserved.
Preliminary data sheet
Rev. 02 — 22 January 2009
23 of 66
NXP Semiconductors
TFA9812
BTL stereo Class-D audio amplier with I2S input
The selected PWM switching frequency is 400 kHz by default and can be set to 350 kHz,
700 kHz and 750 kHz in I2C control mode. In Legacy mode 400 kHz is the only option and
this scales linearly if 32 kHz or 48 kHz is used as fs.
Remark: The selected sample frequency, fs (selected) must be equal to the sample
frequency (fs) in I2C control mode.
Remark: The performance of AM radio reception can sometimes be improved by
selecting non-interfering frequencies for the PWM signal.
8.6 Class-D amplication
The Class-D power amplication of the PWM signal is carried out in two BTL power
stages. The output signal voltage level is determined by the values on the VDDP pins.
The power ampliers can be explicitly put into 3-state mode by using the pin ENABLE as
shown in Table 19. The ENABLE pin is functional in Legacy mode and in I2C mode.
[1]
Can be overruled by a forced 3-state in Sleep or Fault mode.
8.7 Protection mechanisms
The TFA9812 has a wide range of protection mechanisms to facilitate optimal and safe
application. All of these are active in both I2C and Legacy control modes.
The following protections are included in the TFA9812:
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
The reaction of the device to the different fault conditions differs per protection.
Table 19.
ENABLE pin functionality
ENABLE pin value
Function
0
Output stages in 3-state mode.
1
Switching enabled [1].
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