Frequency (Hz)
THD
+N
(%)
0.0001
0.001
0.01
0.1
1
10
20
200
2000
20000
D016
1 W
20 W
75 W
Power (W)
THD
+N
(%)
0.01
0.1
1
10
100 200
0.001
0.01
0.1
1
10
D007
Setup By Mode
6
SLAU751 – November 2017
Copyright © 2017, Texas Instruments Incorporated
TPA3251 Evaluation Module
Figure 8. RCA Input: THD+N vs Frequency
Figure 9. RCA Input: THD+N vs Power
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.
Table 3. Jumper Configurations (2.1 BTL Mode)
Jumper
Setting
Comment
J29
IN
PVDD to 15-V BUCK
J32
IN
12-V LDO to 12-V TERM
J33
IN
3.3-V LDO to 3.3-V TERM
J36
IN
12-V LDO to GVDD
J16
3 to 4
MASTER MODE 600kHz
J22
IN
OUTA CAP SHUNT
J23
IN
OUTB CAP SHUNT
J24
OUT
OUTC CAP SHUNT
J25
OUT
OUTD CAP SHUNT
J5
1 to 2
M1 – H
J6
2 to 3
M2 – L
J7
OUT
PBTL SELECT INC
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.
