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TAS5182IDCAR Datasheet(PDF) 9 Page - Texas Instruments |
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TAS5182IDCAR Datasheet(HTML) 9 Page - Texas Instruments |
9 / 18 page 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 0 0 Multiple errors (TAS5182 gate outputs low, MOSFET outputs HI-Z) 0 0 1 Not valid 0 1 0 Overtemperature error (TAS5182 gate outputs low, MOSFET outputs HI-Z) 0 1 1 Overtemperature warning (normal operation) 1 0 0 Overcurrent error (TAS5182 gate outputs low, MOSFET outputs HI-Z) 1 0 1 Not valid 1 1 0 GVDD undervoltage error (TAS5182 gate outputs low, MOSFET outputs HI-Z) 1 1 1 Normal operation |
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