Datasheet

HPA302
TPS5122xEVM
CH1
Oscilloscope
TP1
TP2
GNDIVIN
DMM1
+
-
TP7
(VREG5)
TP9
(VREG3)
DMM5
+
-
TP8
(VREF2)
DMM6
+
-
CH2
Oscilloscope
TP12
TP13
DMM3
-
GNDS
SYNC
DMM4
+
-
DMM2
+
-
VOUT1
GND1
GND2
VOUT2
TP14
TP15
Electronic
Load-1
+
-
12V/10 A
Power
Supply
+
-
Electronic
Load-1
+
-
+
Test Setup and Procedure www.ti.com
4 Test Setup and Procedure
4.1 Test Setup
Connect test equipment and HPA302-EVM board as shown in Figure 2.
Figure 2. Equipment Setup for TPS51220EVM Board
4.2 Test Procedure
1. Ensure that the switches S1 (EN1), S2 (EN2), and S3 (EN) are in OFF position.
2. Ensure that the shunt jumpers for JP1 (TRIP) is set 7-pin to 8-pin (VREG5; Vocl = 60 mV,
Discharge-enabled), JP2 (FUNC) is set 1-pin to 2-pin (GND; UVP/OVP-enabled), and JP3, JP4 are set
3-pin to 4-pin (VREF2; Auto-skip).
3. Apply appropriate VIN voltage to VIN and GNDI terminals. Check that VREG3 (3.3V-LDO) starts up.
4. Turn S3 (EN) to ON. Check that VREG5 (5V-LDO) and VREF2 (2V-Ref) start up.
5. When S1 (EN1) is turned to ON, CH1-output starts up.
6. When S2 (EN2) is turned to ON, CH2-output starts up.
5 Configuration
Users can configure this EVM per the following configurations.
5.1 Switching Frequency Selection
The switching frequency can be set by the RF-resistor (R15) or applying external clock into RF pin on the
EVM.
Default setting is 280-kHz using RF resistor.
4
High-Performance Synchronous Buck EVM Using the TPS51220 SLVU251A–June 2008–Revised May 2011
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