Texas Instruments TPS51220A EVM-476, Руководство пользователя

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6.4 Control Architecture and OVP Select
1. All jumper modifications should be done with no power applied to the EVM.
2. The FUNC jumper (JP2) allows the user to select the control architecture the EVM uses to control the output.
It also enables or disables the OVP function. Table 6-2 describes each possible selection.
Table 6-2. FUNC (jumper JP2) Selections
JUMPER LOCATION MODE
CMODE_ON (1 and 2 shorted) default Current mode control and OVP enabled
DCAP_OFF (3 and 4 shorted) D-Cap mode control and OVP disabled
DCAP_ON (5 and 6 shorted) D-Cap mode control and OVP enabled
CMODE_OFF (7 and 8 shorted) Current mode control and OVP disabled
3. Once a mode has been selected efficiency and regulation measurements may be retaken. Repeat steps 3 to
11 of Section 6.1 . The engineer should reduce the step current when the output is less than 1 A. Section 7
shows typical data for the various modes of operation
6.5 Overcurrent Trip Level and Output Discharge Select
1. All jumper modifications should be done with no power applied to the EVM.
2. The TRIP jumper (JP3) allows the user to select the voltage level used by the EVM to implement current
limit. It also enables or disables the output discharge function. Table 6-3 describes each possible selection.
Table 6-3. TRIP (JP3) Selections
JUMPER LOCATION MODE
UL_D-ON (1 and 2 shorted)
Overcurrent uses ultra low voltage threshold (31 mV typical) and output
discharge is enabled
UL_OFF (3 and 4 shorted)
Overcurrent uses ultra low voltage threshold (31 mV typical) and output
discharge is disabled
LV_OFF (5 and 6 shorted)
Overcurrent uses low voltage threshold (60 mV typical) and output discharge is
disabled
LV_D-ON (7 and 8 shorted) default
Overcurrent uses low voltage threshold (60 mV typical) and output discharge is
enabled
3. Once a mode has been selected efficiency and regulation measurements may be retaken. Repeat steps 3 to
11 of Section 6.1 . The engineer should reduce the step current when the output is less than 1 A. Section 7
shows typical data for the various modes of operation
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10 TPS51220A Buck Controller Evaluation Module User's Guide SLUU381B – SEPTEMBER 2009 – REVISED FEBRUARY 2022
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