Using TPA3255EVM in Different Output Configurations
9
SLOU441 – July 2016
Copyright © 2016, Texas Instruments Incorporated
TPA3255EVM
4
Using TPA3255EVM in Different Output Configurations
The TPA3255EVM can be configured for four different output operations. The 2.0 BTL configuration is the
default set up of the TPA3255EVM described in
. The remaining three configurations are 2.1
BTL plus two single-ended (SE) outputs, 0.1 PBTL output, and 4.0 single-ended (SE) outputs.
Table 4. Mode Selection Pins
Mode Pins
Input Mode
Output Configuration
Description
M2
M1
0
0
2N + 1
2 × BTL
Stereo BTL output configuration
0
1
2N/1N + 1
1 × BTL + 2 × SE
2.1 BTL + SE mode
1
0
2N + 1
1 × PBTL
Paralleled BTL configuration. Connect INPUT_C and INPUT_D to
GND.
1
1
1N + 1
4 × SE
Single-ended output configuration
4.1
BTL Plus Two SE (2.1) Operation
Configure the EVM as follows for 2 SE + 1 BTL operation:
Table 5. 2 SE + 1 BTL Default Jumper States
Jumper
Setting
Comment
J29
IN
PVDD to 15-V BUCK
J31
IN
12-V LDO to 12-V TERM
J32
IN
3.3-V LDO to 3.3-V TERM
J33
IN
3.3-V LDO to 3.3-V TERM
J21
IN
CSTART SE
J16
3 to 4
MASTER MODE
J5
1 to 2
M1 – 2XSE + BTL
J6
2 to 3
M2 - 2XSE + BTL
J22
IN
OUTA CAP SHUNT
J23
IN
OUTB CAP SHUNT
J24
OUT
OUTC CAP SHUNT
J25
OUT
OUTD CAP SHUNT
J26
2 to 3
INC SELECT
J27
2 to 3
IND SELECT
J7
OUT
PBTL SELECT INC
J8
OUT
PBTL SELECT IND
J10
OUT
INC/D DIFF INPUT
J12
OUT
INC/D DIFF INPUT
J4
1 to 2
INA/B SE INPUT
J19
1 to 2
INC/D SE INPUT
•
Set
J6
to L and
J5
to H.
•
Connect left (stereo) speaker/power resistor load (2–4
Ω
) positive terminal to OUTC and remove
jumper
J24
.
•
Connect right (stereo) speaker/power resistor load (2–4
Ω
) positive terminal to OUTD and remove
jumper
J25
.
•
Connect subwoofer (mono) speaker/power resistor load (4–8
Ω
) positive terminal to OUTA and
negative terminal to OUTB.
•
Set
J19
jumper position to DIFF.
•
Connect
left
(stereo) channel input to female RCA jack input C/CD (
WHITE
) for OUTC speaker.
