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Setup By Mode
10
1
0.1
0.01
0.001
0.0001
20
200
Figure 8. RCA Input: THD+N vs Frequency
2.2
BTL MODE (Three-Speaker Output)
OUTC and OUTD are the SE output channels and OUTA and OUTB are the BTL channels for 2.1
operations. OUTC and OUTD can only be in DIFF input mode.
1. Set J6 to L and J5 to H.
2. Remove jumpers J24 and J25.
3. Connect the positive side of the left channel load to OUTC (J2- RED) terminal and the negative side of
the left channel load to the GND (J20) terminal.
4. Connect the positive side of the right channel load to OUTD (J2-BLACK) terminal and the negative
side of the right channel load to the GND (J20) terminal.
5. Connect the positive terminal to OUTA (J9-RED) and the negative terminal to OUTB (J9-BLACK).
6. Set the J19 jumper position to DIFF.
7. Input configuration:
a. SE inputs: Connect the RCA male jack to the female RCA jack input A/AB (J3-RED) and set the J4
jumper positions to SE. Set J26, J27, J34, and J35 to RCA.
b. Differential inputs: Connect the positive RCA male jack to the female RCA jack input A/AB ( J3-
RED) and connect the negative RCA male jack to the female RCA jack input B (J14-BLACK) and
set the J4 jumper positions to DIFF. Set J26, J27, J34, and J35 to RCA.
c. AIB inputs: Set J26, J27, J34, and J35 to AIB.
2.3
PBTL Mode (One-Speaker Output)
This mode uses all four half bridges for a mono output, allowing for the maximum power output from the
device across one load.
6
TPA3251 Evaluation Module
1 W
20 W
75 W
2000
20000
Frequency (Hz)
D016
Table 3. Jumper Configurations (2.1 BTL Mode)
Jumper
Setting
J29
IN
J32
IN
J33
IN
J36
IN
J16
3 to 4
J22
IN
J23
IN
J24
OUT
J25
OUT
J5
1 to 2
J6
2 to 3
J7
OUT
Copyright © 2017, Texas Instruments Incorporated
10
1
0.1
0.01
0.001
0.01
0.1
1
Power (W)
Figure 9. RCA Input: THD+N vs Power
Comment
PVDD to 15-V BUCK
12-V LDO to 12-V TERM
3.3-V LDO to 3.3-V TERM
12-V LDO to GVDD
MASTER MODE 600kHz
OUTA CAP SHUNT
OUTB CAP SHUNT
OUTC CAP SHUNT
OUTD CAP SHUNT
M1 – H
M2 – L
PBTL SELECT INC
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www.ti.com
10
100 200
D007
SLAU751 – November 2017
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