Datasheet

V
SW_OUT 1
V
IN
12V
GND
V
SW_IN
V
SW_OUT 2
V
OUT
Nfault_1Nfault_2
JP6:EN
SW1
JP5:EN
SW2
JP3, 4:
ROSC
JP2:SS
JP1:EN
JP7:MODE
A
BENCH TEST SETUP CONDITIONS www.ti.com
4 BENCH TEST SETUP CONDITIONS
4.1 Headers Description and Jumper Placement
Figure 6. Headers Description and Jumper Placement
Test points:
(A) LX of V
OUT
4.2 Jumpers and Switches
Table 2. Jumpers and Switches
NO. FUNCTION PLACEMENT COMMENT
Connect EN1 to GND to disable V
OUT
1, connect EN1 to Vin
JP1 Buck Enable (EN) through a resistor to enable V
OUT
1; Leave open to enable
V
OUT
1.
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.
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 Switch 2 Enable ground to disable power switch 2; Leave it open to enable Not recommend to leave open
power switch through internal 1.25-MΩ pull up resistor
Connect this pin to high enable power switch 1; connect it to
JP6 Switch 1 Enable ground to disable power switch 1; Leave it open to enable Not recommend to leave open
power switch through internal 1.25-MΩ pull up resistor.
Connect this pin to ground force the buck converter to run in
JP7 Sync/Mode PWM mode; connect an external clock signal to this pin force
the buck converter to synchronize to the clock.
6
TPS65280EVM User’s Guide SLVU722–June 2012
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