Texas Instruments TPS65265EVM-705, User Manual, Page: 7 / 13

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Power-Up Procedure
Table 3. Jumpers
# Function Placement Comment
J6 Buck1 enable (EN1) Connect EN1 to GND to disable VOUT1
spa
Connect EN1 to HIGH or leave open to enable VOUT1
J7 Buck2 enable (EN2) Connect EN2 to GND to disable VOUT2
spa
Connect EN2 to HIGH or leave open to enable VOUT2
J8 Buck3 enable (EN3) Connect EN3 to GND to disable VOUT3
spa
Connect EN3 to HIGH or leave open to enable VOUT3
J9 MODE Power sequencing mode control pin.
spa
Connect MODE pin to GND or HIGH, set the power sequence
with pre-defined power up and power down sequence.
spa
Leave open to set power up and down with dedicated enable
pin.
5 Power-Up Procedure
Power-up with dedicated enable pin:
1. Apply 4.5 V–17 V to J5
2. Toggle J6 , J7, or J8 to enable VOUT1, VOUT2, and VOUT3, respectively
3. Apply loads to the output connectors
Six bucks power sequence schemes with the pre-defined power up and power down sequence, shown in
Table 4 .
1. Connect J9 to GND or high
2. Connect J6 to High(or Low), J7 to High(or Low)
3. Apply 4.5 V–18 V to J5
4. Toggle J8 to enable VOUT1, VOUT2, and VOUT3 (power up sequence shown in Table 4 )
5. Apply loads to the output connectors
Table 4. Power Sequencing
Mode EN1 EN2 EN3 Start Sequencing Shutdown Sequencing
Low High High Used to start/stop bucks in buck1 → buck2 → buck3 Buck3 → buck2 → buck1
sequence
Low Low High Buck2 → buck1 → buck3 Buck3 → buck1 → buck2
Low High Low Buck2 → buck3 → buck1 Buck1 → buck3 → buck2
High High High Buck1 → buck3 → buck2 Buck2 → buck3 → buck1
High Low High Buck3 → buck1 → buck2 Buck2 → buck1 → buck3
High High Low Buck3 → buck2 → buck1 Buck1 → buck2 → buck3
High/Low Low Low Reserved Reserved Reserved
7 SLVUAK9 – December 2015 TPS65265EVM-705 Evaluation Module
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