S001
Test Summary
4.1
Equipment
•
Adjustable dc power supply between 1.8 V and 4 V with adjustable current limit set to ~150 mA
•
Load: system load or resistive load
≥
21
Ω
•
Three Fluke 75 DMMs (equivalent or better)
•
Oscilloscope, model TDS222 (equivalent or better)
4.2
Equipment and EVM Setup
Table 1. Setup I/O Connections and Configuration for Evaluation of TPS62730 EVM
Jack/Component (Silk Screen)
Connect or Adjustment To:
J1-1/2 (Vin)
Power supply positive lead, preset to 3.3 VDC, 150-mA current limit
J2-1 (+ SNS); input
Positive lead of DMM #1
J2-2 (- SNS); input
Negative lead of DMM #1
J3-1/2 (GND)
Power supply negative lead (3.3 VDC supply)
J4-1/2 (Vout)
Positive lead to system load or load resistance
J5-1 (+ SNS); output
Positive lead of DMM #2
J5-2 (- SNS); output
Negative lead of DMM #2
J6-1/2 (GND)
Negative lead to system load or load resistance
J7-1 (STAT)
Positive lead of DMM meter #3
J7-2 (GND)
Negative lead of DMM meter #3
JP1-1/2 (ON)
Apply shunt to ON for converter operation
JP1-2/3 (Bypass)
Do not apply shunt until procedures calls for change.
Connect the meters, scope probes, output load, shunt, and input power supply as listed in
and set
scope to 200 ns/div, positive trigger, dc-coupled on CH1, CH2: ac-coupled and 10 mV/div. Additional
channels can be added or probes can be moved to view Vin, Vstat and Vbypass. The resistive load can
be replaced with a system load or decade load box to vary the load between 1 k
Ω
and 21
Ω
.
Figure 1. EVM Schematic and Evaluation Setup
3
SLVU455
–
April 2011
TPS62730 Stepdown Converter With Bypass Mode for Ultralow-Power Wireless
Applications
Copyright
©
2011, Texas Instruments Incorporated
