TECHNICA L INFORMA T ION

TA2024 Preliminary, Rev. 1.0

Page 9

Over-current Protection

An over-current fault occurs if more than approximately 7 amps of current flows from any of the

amplifier output pins. This can occur if the speaker wires are shorted together or if one side of the

speaker is shorted to ground. An over-current fault sets an internal latch that can only be cleared if

the MUTE pin is toggled or if the part is powered down. Alternately, if the MUTE pin is connected to

the FAULT pin, the HIGH output of the FAULT pin will toggle the MUTE pin and automatically reset

the fault condition.

Overload

The OVERLOADB pin is a 5V logic output. When low, it indicates that the level of the input signal

has overloaded the amplifier resulting in increased distortion at the output. The OVERLOADB signal

can be used to control a distortion indicator light or LED through a simple buffer circuit, as the

OVERLOADB cannot drive an LED directly.

Sleep Pin

The SLEEP pin is a 5V logic input that when pulled high (>3.5V) puts the part into a low quiescent

current mode. This pin is internally clamped by a zener diode to approximately 6V thus allowing the

pin to be pulled up through a large valued resistor (1meg

mode, the sleep pin should be grounded.

Fault Pin

The FAULT pin is a 5V logic output that indicates various fault conditions within the device. These

conditions include: low supply voltage, low charge pump voltage, low 5V regulator voltage, over

current at any output, and junction temperature greater than approximately 155

°C. All faults except

overcurrent all reset upon removal of the condition. The FAULT output is capable of directly driving

an LED through a series 200

Ω resistor. If the FAULT pin is connected directly to the MUTE input an

automatic reset will occur in the event of an over-current condition.