TFA9810TN1 Datasheet, PDF (19/29 Pages) NXP Semiconductors – Stereo full-bridge audio amplifier 2 x 12 W

NXP Semiconductors
TFA9810
Audio amplifier 2 x 12 W
25
P_o
(W)
20
15
10
010aaa019
(3)
(2)
(1)
5
0
8
12
16
20
V_P (V)
(1) R_L = 4 Ω
(2) R_L = 6 Ω
(3) R_L = 8 Ω
Fig 26. BTL output power as function of supply voltage: THD = 0.5 %. 3 A
30
P_o
(W)
20
10
010aaa020
(3)
(2)
(1)
0
8
12
16
20
V_P (V)
(1) R_L = 4 Ω
(2) R_L = 6 Ω
(3) R_L = 8 Ω
Fig 27. BTL output power as function of supply voltage: THD = 10 %. 3 A
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
Equation 3:
I_Omax ≤ -_R----_L----₊----₂-----_×-----₍-^V-_R----^PD----_S--_o---_n----₊-----_R----_s--₎ ≤ 3 A
(3)
Where:
• V_P = supply voltage (V_DDPx − V_SSPx) [V].
TFA9810_3
Product data sheet
Rev. 03 — 20 February 2008
© NXP B.V. 2008. All rights reserved.
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