Datasheet
4.3 List of Test Points
4.4 Note on Power Up and Power Down
4.4.1 Workstation
4.4.2 Power Up
Test Setup
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Table 3 lists the functions of each test point.
Table 3. Test Points
TEST POINTS NAME DESCRIPTION
TP1 V
IN
+ 3.3V or 2.5V input
TP2 GND GND for V
IN
and VDDQ measurement
TP3 VDDQ VDDQ input 1.2 V to 2.5 V
TP4 VLDOIN VLDOIN input 1.2 V to 2.5 V
TP5 GND GND for VLDOIN measurement
TP6 GND GND for VTT measurement
TP7 VTT VTT output
TP8 PGOOD Monitors power good signal
TP9 ENABLE Monitors enable signal
TP10 CHB Input B for loop analysis, See section 6.5
TP11 CHA Input A for loop analysis, See section 6.5
TP12 GND GND for PGOOD and ENABLE measurement
TP13 5VIN 5-V input for transient load
TP14 GND GND for loop measurement
TP15 CLK_IN Monitor the load transient timing
TP16 GND GND for 5VIN measurement
TP17 GND GND for CLK_IN signal measurement
TP18 VTTREF VTTREF output
TP19 GND GND for VTTREF measurement
The following steps are guidelines for power up and power down of the EVM. Never walk away from a
powered EVM.
An ESD workstation is recommended. Make sure that an ionizer is on. Any wrist straps, boot straps or
mats must connect the user to earth ground before the EVM is removed from the protective packaging
and power is applied to it. Electrostatic smock and safety glasses should also be worn.
1. Prior to connecting the DC input source, limit the source current and then connect the DC source to
EVM as shown in Figure 3
• Set DC source 1 source current limit to 1 A.
• Set DC source 2 source current limit to 1 A.
• Set DC source 3 source current limit to 10 A.
• Set DC source 4 source current limit to 1 A.
2. Connect voltage meter (V1, V2, V3, V4, V5, V6) as shown in Figure 3 .
3. For operation with load, connect Load 1 and Load 2 to EVM as shown in Figure 3 .
a. Connect Load 1 to J5 and Load 2 to J4
b. Set electronic load to constant current mode with initial value of 0 A.
4. Power on the DC source 1.
5. Power on the DC source 2.
6. Power on the DC source 3.
Using theTPS51200 EVM Sink/Source DDR Termination Regulator8 SLUU323 – JUNE 2008
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