Datasheet

4 Test Setup and Results
4.1 Test Setup
Electronic
Load1
Electronic
Load2
DMM1
DMM2
12V/10A
PowerSupply
DMM3
+
_
+
_
Oscilloscope
CH1
CH2
Oscilloscope
+
_
VO2_GND
VO2
CN2
VO1
VO1_GND
VBAT_GND
VBAT
CN1
HPA399
TPS51123EVM
+
_
+
_
_
+
Electronic
Load1
Electronic
Load2
DMM1
DMM2
12V/10A
PowerSupply
DMM3
+
_
+
_
Oscilloscope
CH1
CH2
Oscilloscope
+
_
VO2_GND
VO2
CN2
VO1
VO1_GND
VBAT_GND
VBAT
CN1
VO2_GND
VO2
CN2
VO1
VO1_GND
VBAT_GND
VBAT
CN1
HPA399
TPS51123EVM
+
_
+
_
_
+
4.2 Test Procedure
Test Setup and Results www.ti.com
Connect test equipment and TPS51123EVM board as shown in Figure 2 .
Figure 2. Equipment Setup for TPS51123EVM board
1. Ensure the switches SW4 (ENC) and SW3 (EN0) are in “OFF” position.
2. Ensure the shunt jumper for JP1 is set 5-pin to 6-pin (Med1), and shunt jumper for JP2 is set 5-pin to
6-pin (Auto-skip).
3. Apply appropriate VBAT voltage to VBAT and VBAT_GND terminals.
4. Turn on SW3 (EN0), and both VREG5 (5V-LDO) and VREG3 (3.3V-LDO) start up.
5. When SW3 stays on, VREF (2V-REF) enables.
6. When SW3 stays on and turn on SW4 (ENC), CH1-output, and CH2-output start up.
High Performance Synchronous Buck EVM Using the TPS511234 SLUU340 – FEBRUARY 2009
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