Texas Instruments TPA3200D1 - Manual (Page 20)

www.ti.com
1 nF
Ferrite
Chip Bead
OUTP
OUTN
Ferrite
Chip Bead
1 nF
4 or Greater W
0.22 µ F
15
µ
H
15 µ H
OUTP
OUTN
4
Ω
Ferrite
Chip Bead
Ferrite
Chip Bead
1 nF
1 nF
0.22 µ F
1
µ
F
0.1 µ F
0.1
µ
F
33 µ H
33
µ
H
OUTP
OUTN
8
Ω
Ferrite
Chip Bead
Ferrite
Chip Bead
1 nF
1 nF
0.47
µ
F
SHORT-CIRCUIT PROTECTION
TPA3200D1
SLOS442A – MAY 2005 – REVISED JULY 2005
Figure 24. Typical Ferrite Chip Bead Filter (Chip bead example: Fair-Rite 2512067007Y3)
Figure 25. Typical LC Output Filter for 4-
Ω
Speaker, Cutoff Frequency of 41 kHz
Figure 26. Typical LC Output Filter for 8-
Ω
Speaker, Cutoff Frequency of 41 kHz
The TPA3200D1 has short circuit protection circuitry on the outputs that prevents damage to the device during
output-to-output shorts, output-to-GND shorts, and output-to-V
CC
shorts. When a short-circuit is detected on the
outputs, the part immediately disables the output drive and enters into shutdown mode. This is a latched fault
and must be reset by cycling the voltage on the SHUTDOWN pin to a logic low and back to the logic high state
for normal operation. This will clear the short-circuit flag and allow for normal operation if the short was removed.
If the short was not removed, the protection circuitry will again activate.
Two Schottky diodes are required to provide short-circuit protection. The diodes should be placed as close to the
TPA3200D1 as possible, with the anodes connected to PGND and the cathodes connected to OUTP and OUTN
as shown in the application circuit schematic. The diodes should have a forward voltage rating of 0.5 V at a
minimum of 1 A output current and a dc blocking voltage rating of at least 30 V. The diodes must also be rated to
operate at a junction temperature of 150°C.
If short-circuit protection is not required, the Schottky diodes may be omitted.
20