5 Configuration
This EVM can be set at a configuration of the user's choice. Please refer to the following specific configuration
setting sections.
5.1 Switching Frequency Selection
The switching frequency can be set by the TONSEL pin using JP1 on the EVM. The default setting is 245 kHz
for CH1 and 305 kHz for CH2.
Table 5-1. Switching Frequency Selection
TONSEL
CONNECTION
SWITCHING FREQUENCY (kHz)
CH1
CH2
GND (SLOW)
200
250
VREF (MED1)
245
305
VREG3 (MED2)
300
375
VREG5 (FAST)
365
460
5.2 Operation Mode Selection
Operation mode can be set by the SKIPSEL pin using JP2 on the EVM. The default setting on the EVM is
auto-skip mode.
Table 5-2. Operation Mode Selection
SKIPSEL CONNECTION
OPERATION MODE
GND
Auto skip
VREF
PWM only
VREG5
Out-of-Audio
Configuration
6
TPS51123 Buck Controller Evaluation Module User's Guide
SLUU340A – FEBRUARY 2009 – REVISED JANUARY 2022
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