TA2024C Tripath Technology Inc., TA2024C Datasheet - Page 14

• Manufacturer Part Number: TA2024C
• Description: Stereo 15w 4 ? Class-t ?igital Audio Amplifier Using Digital Power Processing ?echnology
• Manufacturer: Tripath Technology Inc.

O v e r - c u r r e n t P r o t e c t i o n
O v e r l o a d
S l e e p P i n
F a u l t P i n
P o w e r D i s s i p a t i o n D e r a t i n g
14
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.
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.
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 : recommended) to V
SLEEP mode, the sleep pin should be grounded.
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 q 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 2k : 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.
For operating at ambient temperatures above 25 q C the device must be derated based on a
150 q C maximum junction temperature, TJMAX as given by the following equation:
where…
P
T
T
T
P
JA
JMAX
A
DISS
DISS
= operating ambient temperature
= junction-to-ambient thermal resistance
= maximum power dissipation
= maximum junction temperature of TA2024C
T (
JMAX
T
JA

T
A
)
T r i p a t h T e c h n o l o g y , I n c . - T e c h n i c a l I n f o r m a t i o n
TA2024C –KL/1.0/01.06
DD
. To disable