Datasheet

5 Configuration
5.1 Switching Frequency Selection
5.2 Operation Mode Selection
Configuration www.ti.com
This EVM can be set at a configuration of the user's choice. Please refer to the following specific
configuration setting sections
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 2. Switching Frequency Selection
SWITCHING FREQUENCY (kHz)
TONSEL
CONNECTION
CH1 CH2
GND (SLOW) 200 250
VREF (MED1) 245 305
VREG3 (MED2) 300 375
VREG5 (FAST) 365 460
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 3. Operation Mode Selection
SKIPSEL CONNECTION OPERATION MODE
GND Auto skip
VREF PWM only
VREG5 Out-of-Audio™
6 High Performance Synchronous Buck EVM Using the TPS51123 SLUU340 – FEBRUARY 2009
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