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)： 6/31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
6 of 31
Philips Semiconductors
TDA8931
Power comparator 1
×
20 W
Pin HVPI will be on its final level of 0.5V
P
before the device starts switching. This results
into a plop-noise free start-up behavior.
8.5 Half supply voltage capacitor charger (pin HVP)
When the device is in Standby mode, the SE capacitor C15 (see
Figure 5
) will be charged
until it reaches the half of the supply voltage. This current charges capacitor C15 within
0.5 seconds when a capacitor of 1000
μ
F is used. When the voltage on pin HVP has
reached the level of 0.5V
P
it releases pin ENABLE for external use.
When the device is in Operating mode, pin HVP is switched to floating to minimize
dissipation.
When the supply voltage drops, capacitor C15 is discharged and the device is switched off
to avoid plop noise.
8.6 Protections
Overtemperature, overcurrent, overvoltage and undervoltage sensors are included in the
TDA8931. When one of these sensors exceeds its threshold level the output power stage
is switched off and the output stage becomes floating. After 1.5
μ
s the device will try to
restart. When the fault condition is removed the output stage is switched on.
[1]
Pin DIAG = LOW for minimal 1.5
μ
s.
8.6.1
Overtemperature protection (OTP)
If the junction temperature T
j
exceeds the threshold level of approximately 150
°
C then the
device will shut down immediately. The device will start switching again when the
temperature drops.
8.6.2
Overcurrent protection (OCP)
If the output current exceeds the maximum output current threshold level (e.g. when the
loudspeaker terminals are short-circuited it will be detected by the current protection) the
device will shut-down.
8.6.3
Overvoltage protection (OVP)
When the supply voltage applied to the TDA8931 exceeds the maximum supply voltage
threshold level the device will shut down. The supply voltage on which the device stops
operating is determined by two external resistors R1 and R2.
Table 5:
Protection
Symbol
OTP
OCP
OVP
UVP
ODP
Overview protections
Output
pin DIAG
Remark
Condition
T
j
> 150
°
C
I
O
> I
OCP
V
P
> V
P(OVP)fix
V
P
< V
P(UVP)
I
O
> I
OCP
and
T
j
> 140
°
C
LOW
[1]
self recovering when fault is removed
LOW
recovering by switching pin POWERUP: first to Sleep
mode and then to Standby mode
recovering by removing supply voltage
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