參數(shù)資料
型號(hào)： TDA8931T
廠商： NXP SEMICONDUCTORS
元件分類： 消費(fèi)家電
英文描述： Power comparator 1 X 20 W
中文描述： SPECIALTY CONSUMER CIRCUIT, PDSO20
封裝： 7.50 MM, PLASTIC, MS-013, SOT-163-1, SO-20
文件頁(yè)數(shù)： 18/31頁(yè)
文件大?。?/td> 165K
代理商： TDA8931T
9397 750 13847
Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Preliminary data sheet
Rev. 01 — 14 January 2004
18 of 31
Philips Semiconductors
TDA8931
Power comparator 1
×
20 W
14.2 Output current limiting
The output current is limited by the OCP with a threshold level of 3.3 A (minimum). During
normal operation the output current should not exceed this threshold level, otherwise the
output signal is distorted. The peak output current should stay below 3.3 A and can be
estimated using the following equation:
(4)
Where:
I
O
= output current in the load in
V
P
= supply voltage (V
DDP
V
SSP
)
R
DSon
= on-resistance power switch
R
L
= load impedance
R
coil
= series resistance output coil
R
ESR
= ESR of the single-ended capacitor
Example:
With a 4
load the OCP will be triggered below a supply voltage of 28 V. This
will result in an absolute maximum output power of P
o
= 26 W at THD = 10 %.
14.3 Low pass filter considerations
For a flat frequency response (second order Butterworth filter) it is necessary to change
the LC-filter components (L1 and C14) according to the speaker impedance.
Table 12
shows the required components values in case of a 4 W, 6 W or 8 W speaker impedance.
14.4 Thermal behavior (printed-circuit board considerations)
The SO20 package of the TDA8931T has special thermal corner leads, significantly
increasing the power capability (reducing R
th
). The corner leads (pins 1, 10, 11 and 20)
should be attached to a copper area (V
SS
) on the PCB for cooling.
The typical thermal resistance R
th(j-a)
of the TDA8931T is 24 K/W (free air and natural
convection) when soldered on a double sided FR4 PCB with 35
μ
m copper layer and
cooling area of approximately of 28 cm
2
.
I
O
V
R
L
2
R
DSon
R
coil
R
ESR
+
+
+
)
------------------------------------------------------------------------------
3.3
≤
≤
Table 12:
Speaker impedance
(
)
4
6
8
Filter components values
L1 value
(
μ
H)
22
33
47
C14 value
(nF)
680
470
330
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