4
Test Summary
4.1
Equipment
4.2
Equipment and EVM Setup
4.3
Test Procedure
www.ti.com
Test Summary
This section covers the setup and tests performed in evaluating the EVM.
•
Power 5.1
±
0.1 V, current limit set to 1.5
±
0.1 A
•
Battery: 4.2 V LiCoO2 or equivalent
•
LDO Load: from 100-
Ω
to 10k-
Ω
resistor
•
Three Fluke 75 DMMs (equivalent or better)
•
Oscilloscope, Model TDS220 (equivalent or better)
•
Preset P/S#1 to 5.1
±
0.1 V, 1.5
±
0.1-A current limit, turn off and connect to J1 (+ to IN and - to GND).
•
Connect a fully discharged battery to J2 (+ to BAT+ and - to BAT-).
•
Apply a 1-k
Ω
load resistor to J3-1/2.
•
Apply shunt jumpers to JMP1, JMP6, JMP7, and JMP8.
•
Set switch, SW1, in the UP position.
•
Adjust R7 fully CW, and then back off four turns CCW.
•
Connect the DMMs and oscilloscope as shown in
, if desired.
Figure 1. Evaluation Setup Charging Circuit Shown; Pulse Programming Circuit not Shown
1. Make sure setup procedure was followed.
2. Turn on P/S#1; preset to 5.1 Vdc.
3. Verify that the PG (D1) and CHG (D2) LEDs turned on. Verify that the input/output current is around
~0.4 A (DMM3 is ~40 mV). This is the power-up USB500 default mode (no programming pulses have
been delivered yet) and typically delivers up to ~400 mA. The charge current limit is set lower than 500
mA to ensure that the total charge and LDO (maximum of 50 mA) current do not exceed 500 mA on
the input.
4. Set the scope to trigger off of CH2 (positive trigger, 1 ms/div), to capture the program pulse going to
(EN/SET TP6). Note that only one shunt at a time should be placed on JMP1 through JMP5 to select
the desired number of programmed pulses.
SLUU358 – April 2009
1.1-A, Single-Input, Single-Cell, Li-Ion Battery Charger With 50-mA LDO and 2.3-A Production Test Support
3