Tfa9812, Nxp semiconductors – NXP Semiconductors TFA9812 User Manual
Page 46
TFA9812_2
© NXP B.V. 2009. All rights reserved.
Preliminary data sheet
Rev. 02 — 22 January 2009
46 of 66
NXP Semiconductors
TFA9812
BTL stereo Class-D audio amplifier with I
2
S input
[1]
I
P
is the current through the analog supply voltage (V
DDA
) pin added to the current through the power supply voltage (V
DDP
) pin.
[2]
Thermal foldback temperature sensor is not located at hottest spot. Hottest spot is 12
°
C higher.
[3]
Current limiting concept: in overcurrent condition no interruption of the audio signal in case of impedance drop.
[4]
PLL output frequency not external available.
Thermal Foldback (TF)
T
act(th_fold)
thermal foldback
activation
temperature
118
125
132
°
C
OverTemperature Protection (OTP)
T
act(th_prot)
thermal protection
activation
temperature
-
-
160
°
C
OverVoltage Protection (OVP)
V
P(ovp)
overvoltage
protection supply
voltage
20
22.3
24
V
UnderVoltage Protections (UVP)
V
P(uvp)
undervoltage
protection supply
voltage
UVP on V
DDA
7
7.5
8
V
UVP on V
DDA(3V3)
1.6
2.2
3.0
V
OverCurrent Protection (OCP)
I
O(ocp)
overcurrent
protection output
current
3.0
3.3
3.6
A
Window Protection (WP)
V
o
output voltage
high level
-
V
DDA
−
1
-
V
low level
-
REFA + 1
-
V
OverFrequency Protection (OFP)
f
OFP
Overfrequency
protection frequency
At PLL output frequency
100
140
185
MHz
UnderFrequency Protection (OFP)
f
UFP
Underfrequency
protection frequency
At PLL output frequency
30
45
60
MHz
Table 55.
DC characteristics
…continued
Unless specified otherwise, V
DDA
= V
DDP
= 12 V, V
SSP1
= V
SSP2
= 0 V, V
DDA(3V3)
= V
DDD(3V3)
= 3.3 V,
V
SS1
= V
SS2
= REFD = REFA = 0 V, T
amb
= 25
°
C, R
L
= 8
Ω
, f
i
= 1 kHz, f
s
= 44.1 kHz, f
sw
= 400 kHz, 24-bit I
2
S input data,
MCLK clock mode, typical application diagram (
Figure 13
).
Symbol
Parameter
Condition
Min
Typ
Max
Unit