參數(shù)資料
型號(hào)： TPA2054D4AYZKR
廠商： TEXAS INSTRUMENTS INC
元件分類： 音頻／視頻放大
英文描述： 0.94 W, 2 CHANNEL, AUDIO AMPLIFIER, BGA25
封裝： 2.61 X 2.61 MM, GREEN, DSBGA-25
文件頁(yè)數(shù)： 14/30頁(yè)
文件大?。?/td> 858K
代理商： TPA2054D4AYZKR
www.ti.com
SLOS666 – MAY 2010
Class-D Output Amplifiers
To enable both Class-D power amplifiers, set the PA_Enable bit (Register 2, Bit 1) to logic high. The left and
right channel Class-D outputs cannot be separately activated. Total Class-D section typical current is 7 mA when
active and less than 1 mA when deactivated.
All Class-D outputs have short-circuit current protection and thermal overload protection. The PAL_Fault and
PAR_Fault bits (Register 1, Bits 4 and 3) indicate an over-current event on the left and right Class-D channel
outputs. These bits are clear-on-write; only logic low can be written.
The Thermal bit (Register 1, Bit 1) goes to logic high if a thermal shutdown event occurs. It returns to logic low
once the device temperature returns below 150°C.
DirectPath Headphone Amplifier
Set the HPL_Enable bit (Register 2, Bit 3) to logic high to enable the headphone left output and the HPR_Enable
bit (Register 2, Bit 2) to logic high to enable the headphone right output. The headphone amplifier draws 10 mA
of typical supply current with both left and right outputs active and less than 1 mA when deactivated.
The HPL_Fault and HPR_Fault bits (Register 1, Bits 2 and 1) indicate an over-current event on the left and right
headphone outputs. These bits are clear-on-write; only logic low can be written.
HEADPHONE OUTPUT LIMITER LOCKOUT
Setting the LIM_Lock bit (Register 3, Bit 7) to logic high prevents any register changes to the HP_Vout byte
(Register 7, Bits 4-2) and the LIM_Lock bit itself. The LIM_Lock bit will remain locked at logic high until the power
supply is deactivated or logic low is applied to the RESET pin. All volume control, mux modes and shutdown
registers remain writable regardless of LIM_Lock status.
MAXIMUM HEADPHONE POWER REGULATOR
The HP_Vout byte (Register 7, Bits 4-2) sets the maximum output voltage from the headphone amplifiers. This is
useful for limiting the maximum output power to the headphones. The HP_Vout byte sets the internally regulated
supply voltage to the headphone amplifiers according to the table below. The table also shows the equivalent
10% THD output into 16
and 32 loads.
MAX HEADPHONE
POUT,MAX INTO 16
POUT,MAX INTO 32
VOUT,MAX
OUTPUT BYTE: HP_VOUT[2:0]
(10% THD)
000
±VDDHP(1)
130 mW (at VDDHP = 3.6 V)
65 mW (at VDDHP = 3.6 V)
001
±1.13 V
40 mW
20 mW
010
±0.54 V
9 mW
4.5 mW
011
±0.38 V
4.5 mW
2.3 mW
100
±0.315 V
3.1 mW
1.6 mW
101
±0.253 V
2.0 mW
1.0 mW
110
±0.227 V
1.6 mW
0.8 mW
111
±0.196 V
1.2 mW
0.6 mW
(1)
With no load. Maximum output voltage decreases as load resistance decreases.
HEADPHONE GAIN VALUES
For the DirectPath headphone amplifier, left and right output channels
HEADPHONE GAIN REGISTER BYTE:
NOMINAL GAIN
HP_GAIN[1:0]
00
+6 dB
01
0 dB
10
–6 dB
11
–14 dB
Copyright 2010, Texas Instruments Incorporated
21
Product Folder Link(s): TPA2054D4A
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