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參數(shù)資料
| 型號： | TAS5182IDCARG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 100 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO56 |
| 封裝： | GREEN, PLASTIC, HTSSOP-56 |
| 文件頁數(shù)： | 20/20頁 |
| 文件大?。?/td> | 732K |
| 代理商： | TAS5182IDCARG4 |
TAS5182
SLES045E - JUNE 2002 - REVISED MAY 2004
www.ti.com
9
FUNCTIONAL DESCRIPTION
Power Stage Protection
The
TAS5182
device
provides
overcurrent,
overtemperature, and undervoltage protection for the
MOSFET power stage.
Overcurrent Protection (OCP)
To protect the power stage from damage due to high
currents, a VDS sensing system is implemented in the
TAS5182 device. Based on RDS(on) of the power
MOSFETs and the maximum allowed IDS, a voltage
threshold can be calculated which, when exceeded,
triggers the protection latch, causing the SHUTDOWN
terminal to go low. This voltage threshold is resistor
programmable. See the Calculation of Overcurrent
Resistor Values section for more details.
Overtemperature Protection (OTP)
The TAS5182 device has a temperature protection system
that uses an external negative temperature coefficient
(NTC) resistor as a temperature sensor. See the
Overtemperature
Programming
Circuit
section
for
implementation details.
Undervoltage Protection (UVP)
To protect the power output stage during start-up,
shutdown, and other possible undervoltage conditions, the
TAS5182 device provides power stage undervoltage
protection by driving its outputs low whenever GVDD is
under 7 V. With the TAS5182 outputs driven low, the
MOSFETs go to a high-impedance state.
Control Terminals
The TAS5182 device provides input control terminals to
reset each audio channel and also to control the electrical
characteristics of the MOSFET output power stage.
Channel Reset
The reset function enables operation after power up,
re-enables operation after an error event, and disables the
MOSFET output stage switching during power down and
mute. The falling edge of RESET_AB (left audio channel)
or RESET_CD (right audio channel) causes the TAS5182
device to reset. The rising edge of RESET_AB or
RESET_CD causes the TAS5182 device to clear the error
latch and resume normal operation.
MOSFET Output Reset Control
The LOW/HIZ control terminal selects whether the
MOSFET output stage goes into a high-impedance (HI-Z)
state
or
LOW-LOW
state
when
RESET_AB
or
RESET_CD is enabled. In the high-impedance state, the
low-side and high-side MOSFETs are turned off causing
no current flow through the MOSFETs. This effectively
disconnects the load from the power supply rail. In the
LOW-LOW state, the low-side MOSFETs are turned on,
while the high-side MOSFETs are turned off. This causes
a low or ground signal to be output to the load.
Status Terminals
The TAS5182 device provides output status terminals to
report overcurrent, overtemperature, and undervoltage
warnings and errors.
Shutdown Indicator
The SHUTDOWN terminal indicates an error event has
occurred such as overcurrent, overtemperature, or
undervoltage. The SHUTDOWN terminal is pulled high
when RESET_AB or RESET_CD is asserted. ERR0 and
ERR1 terminals along with the SHUTDOWN terminal
indicate the type of warnings and errors. Note that
SHUTDOWN is an open-drain signal. See Table 1 for a
functional description of these signals.
Table 1. TAS5182 Status Signals
ERR0
ERR1
SHUTDOWN
DESCRIPTION
0
Multiple errors (TAS5182 gate outputs low, MOSFET outputs HI-Z)
0
1
Not valid
0
1
0
Overtemperature error (TAS5182 gate outputs low, MOSFET outputs HI-Z)
0
1
Overtemperature warning (normal operation)
1
0
Overcurrent error (TAS5182 gate outputs low, MOSFET outputs HI-Z)
1
0
1
Not valid
1
0
GVDD undervoltage error (TAS5182 gate outputs low, MOSFET outputs HI-Z)
1
Normal operation
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