Texas Instruments TPS65281EVM Evaluation Module TPS65281EVM TPS65281EVM 데이터 시트
제품 코드
TPS65281EVM
POWER-UP PROCEDURE
4.2
Jumpers and Switches
Table 2. Power Connectors
NO.
FUNCTION
DESCRIPTION
JP1
V
IN
Connector
Apply power supply to this connector
JP3
SW_OUT Connector
Output of power switch
JP4
SW_IN Connector
Input of power switch
JP5
V
OUT_BUCK
Connector
Output of buck converter
Table 3. Jumpers and Switches
NO.
FUNCTION
PLACEMENT
COMMENT
Connect a external cap to this pin to program the soft start time
JP2
Soft Start (SS)
of the buck converter; leave this pin open to have default 1-ms
soft start time.
soft start time.
Connect a resistor to this pin to set the switching frequency;
JP3, 4
Switching Frequency
leave it open to set F
SW
to 600 kHz; connect it to ground to set
F
SW
to 300 kHz.
Connect this pin to high enable power switch 2; connect it to
JP5
Power Switch Enable
ground to disable power switch 2; Leave it open to enable
Not recommend to leave open
power switch through internal 1.25-M
Ω
pull up resistor.
Connect EN1 to GND to disable V
OUT1
, connect EN1 to V
IN
JP7
Buck Enable (EN)
through a 100-k
Ω
resistor to enable V
OUT_BUCK
; Leave open to
Not recommend to leave open
enable V
OUT_BUCK
.
JP8
Short Connector
Short these pins to connect V
OUT_BUCK
to SW_IN.
Power switch current limit control pin. An external resistor used
to set current limit threshold of power switch. Recommended
to set current limit threshold of power switch. Recommended
JP9
Current Limit
15 k
Ω ≤
R
LIM
≤
232 k
Ω
. Leave this pin open or connect to
SW_IN to set current limit 1.2 A.
5
POWER-UP PROCEDURE
1. Apply 12 V to J1.
2. Toggle JP7 to enable V
OUT1
.
3. Toggle JP5 to enable power switch.
4. Apply load to the connectors, J3 or J5.
7
SLVU770 – August 2012
TPS65281EVM User’s Guide
Copyright © 2012, Texas Instruments Incorporated