TAS5630B

SLES217D – NOVEMBER 2010 – REVISED MARCH 2015

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Feature Description (continued)

Any fault resulting in device shutdown is signaled by the SD pin going low. Likewise, OTW and OTW2 go low

when the device junction temperature exceeds 125°C and OTW1 goes low when the junction temperature

exceeds 100°C (see Table 1).

Table 1. Error Reporting

OTW2,

SD

OTW1

DESCRIPTION

OTW

0

0

0

Overtemperature (OTE) or overload (OLP) or undervoltage (UVP)

Overload (OLP) or undervoltage (UVP). Junction temperature higher than 100°C (overtemperature

0

0

1

warning)

0

1

1

Overload (OLP) or undervoltage (UVP)

1

0

0

Junction temperature higher than 125°C (overtemperature warning)

1

0

1

Junction temperature higher than 100°C (overtemperature warning)

1

1

1

Junction temperature lower than 100°C and no OLP or UVP faults (normal operation)

Note that asserting either RESET low forces the SD signal high, independent of faults being present. TI

recommends monitoring the OTW signal using the system microcontroller and responding to an overtemperature

warning signal by, for example, turning down the volume to prevent further heating of the device resulting in

device shutdown (OTE).

To reduce external component count, an internal pullup resistor to 3.3 V is provided on both SD and OTW

outputs. Level compliance for 5-V logic can be obtained by adding external pullup resistors to 5 V (see Electrical

Characteristics for further specifications).

7.3.4 Device Protection System

The TAS5630B contains advanced protection circuitry carefully designed to facilitate system integration and ease

of use, as well as to safeguard the device from permanent failure due to a wide range of fault conditions such as

short circuits, overload, overtemperature, and undervoltage. The TAS5630B responds to a fault by immediately

setting the power stage in a high-impedance (Hi-Z) state and asserting the SD pin low. In situations other than

overload and overtemperature error (OTE), the device automatically recovers when the fault condition has been

removed, that is, the supply voltage has increased.

The device functions on errors, as shown in the following table.

Table 2. Device Protection System

BTL Mode

PBTL Mode

SE Mode

Local error in

Turns Off or in

Local error in

Turns Off or in

Local error in

Turns Off or in

A

A

A

A + B

A + B

B

B

B

A + B + C + D

C

C

C

C + D

C + D

D

D

D

Bootstrap UVP does not shut down according to the table; it shuts down the respective half-bridge.

16

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