參數(shù)資料
型號(hào)： TFA9812HN/N1,557
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)： 46/66頁
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
50 of 66
NXP Semiconductors
TFA9812
BTL stereo Class-D audio amplier with I2S input
δ
max = Maximum duty factor (0.96).
The output power at 10 % THD can be estimated using Equation 11:
(11)
Figure 11 and Figure 12 show the estimated output power at THD = 0.5 % and
THD = 10 % as a function of BTL supply voltage for different load impedances.
14.2 Output current limiting
The peak output current is internally limited above a level of 3 A minimum. During normal
operation the output current should not exceed this threshold level of 3 A otherwise the
output signal will be distorted. The peak output current in BTL can be estimated using
(12)
Where:
VP= supply voltage (V) (VDDP-VSSP)
RL= load impedance ()
RDSon= 'On' resistance power switch ()
RS= series resistance output inductor ()
P
O(10%)
1.25 P
O(0.5%)
=
(1) 6
(2) 8
(3) 16
(1) 6
(2) 8
(3) 16
Fig 11. BTL PO (0.5 %) as a function of VP
Fig 12. BTL PO (10 %) as a function of VP
VP (V)
824
20
12
16
010aaa347
10
20
30
0
(1)
(2)
(3)
PO (0.5 %)
(W/channel)
VP (V)
824
20
12
16
010aaa348
15
30
45
0
(1)
(2)
(3)
PO (10 %)
W/channel
I
O max
()
V
P
R
L
2
+
R
DSon
R
S
+
-----------------------------------------------------
≤
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