Datasheet

www.ti.com Bench Test Setup Conditons
5.1 Headers Description
Header
Function LOC Placement Comment
Number
For immediate start-up fit jumper to V3V
JP11 BUCK1 enable (EN1) SW For sequencing do not fit jumper Fit according to test requirement
To disable converter fit jumper to GND
For immediate start-up fit jumper to V3V
JP20 BUCK2 enable (EN2) SW For sequencing do not fit jumper Fit according to test requirement
To disable converter fit jumper to GND
For immediate start-up fit jumper to V3V
JP3 BUCK3 enable (EN3) SW For sequencing do not fit jumper Fit according to test requirement
To disable converter fit jumper to GND
Do not leave this header open.
For forced PWM operation fit jumper to V3V
Use a jumper to set either
JP25 Forced PWM (F_PWM) S For automatic PFM/PWM operation fit
forced PWM mode or automatic
jumper to GND
PFM/PWM mode
USB1 enable For automatic start-up fit jumper to V3V
JP34 SW Fit according to test requirement
(USB1EN) To disable SWITCH fit jumper to GND
JP35 USB1_nFAULT E USB1 fault indicator pulled to 3V3 Fit according to test requirement
JP26 INT S Interruption fault indicator pulled to 3V3 Fit according to test requirement
JP27 PGOOD S PGOOD indicated pulled to 3V3 Fit according to test requirement
5.2 Test Points and Placement
Buck converter outputs are white and have a label for easy location. Close to any of these test points
there are black ground test points to allow for DVM measurement or to use a metal exposed scope probe
to reduce common mode noise measurements. All test points are described in the following table:
Test Point Name Signal COLOR Comment
TP1 GND GND White
TP2 GND GND White
TP3 GND GND White
TP4 Vin Vin Black
TP5 GND GND White
TP6 GND GND White
TP7 GND GND White
TP14 Vout1 Output voltage Buck1 Not fitted
Injection Point gain-phase measurement Normally not
TP14a Not fitted
buck1 used
TP17 Vout1 Output voltage Buck2 Not fitted
Injection Point gain-phase measurement Normally not
TP17a Not fitted
buck2 used
TP37 Vout1 Output voltage Buck3 Not fitted
Injection Point gain-phase measurement Normally not
TP37a Not fitted
buck3 used
TP32 USB1_Vin USB1 switch input Black
TP33 USB1_Vo USB1 switch output Black
7
SLVU568– September 2011 TPS65257 High Current, Synchronous Step Down Three Buck Switcher
Evaluation Module with 1USB Switch and Push Button Controller
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