參數(shù)資料
型號： TFA9812HN
廠商： NXP SEMICONDUCTORS
元件分類： 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
文件頁數(shù)： 18/66頁
文件大?。?/td> 386K
代理商： TFA9812HN
TFA9812_2
NXP B.V. 2009. All rights reserved.
Preliminary data sheet
Rev. 02 — 22 January 2009
25 of 66
NXP Semiconductors
TFA9812
BTL stereo Class-D audio amplier with I2S input
8.7.6 Overdissipation protection
When the output current of the power ampliers exceeds a current value of 3 A and the
temperature is above 140
°C, overdissipation protection is activated and the device enters
Sleep mode. A restart will be initiated automatically when the two overdissipation
conditions are both changed to ‘false’.
Overdissipation is agged by a low DIAG pin and by a high DIAG I2C status bit, see
Under normal conditions thermal foldback prevents overdissipation protection from being
triggered. I2C settings remain valid.
8.7.7 Window protection
Window protection is a feature for protecting the device against shorts from the outputs to
the ground or supply lines. If during power-up one of the outputs is shorted to VSSPx or
VDDP, power-up does not proceed any further. The trigger levels for these conditions are:
OUTxx > VDDA 1 V, or
OUTxx < REFA + 1 V.
The WP alarm is agged by a low DIAG pin and by a high DIAG I2C status bit, see
8.7.8 Lock protection
When the selected clock input source (MCLK, BCK or crystal) stops running, the TFA9812
is able to detect this and set the output stages to 3-state mode. Without this protection
peripheral devices in an application might be damaged.
The PLL lock indication is an I2C reading and will be ‘false’ in the event of a clock
interruption, see Section 9.5.10.
8.7.9 Underfrequency protection
UFP sets the output stages to 3-state mode when the clock input source is too low. The
PWM switching frequency can becomes critically low when the clock input source is lower
than specied. Without UFP peripheral devices in an application might be damaged.
The status of the UFP is shown in I2C reading register, see Section 9.5.10.
8.7.10 Overfrequency protection
OFP sets the output stages to 3-state mode when the clock input source is too high. The
PWM controller can become unstable when the clock input source is higher than
specied. Without OFP peripheral devices in an application might be damaged.
The status of the OFP is shown in I2C reading register, see Section 9.5.10.
Table 20.
Undervoltage trigger levels
Pin name
UVP level
DIAG pin (protection active)
Min
Max
VDDA
≥ 7 V
< 8 V
LOW
VDDA(3V3)
≥ 1.6 V
< 3 V
-
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