Texas Instruments Evaluation Module for BQ24212, 800mA, Single-Input, Single Cell Li-Ion Battery Solar Charger BQ24212EV BQ24212EVM-678 데이터 시트
제품 코드
BQ24212EVM-678
PCB Layout Guideline
2.4
Recommended Test Procedure to Confirm IC Operation
2.4.1
Power Supply
Make sure that EQUIPMENT SETUP steps are followed.
Disconnect LOAD #1. Turn on PS#1.
Measure
Measure
→
V(J1(VBUS)) = 6.5 V
±
200 mV
Measure
→
V(J2(VBAT)) = 0 V
±
200 mV
Measure
→
V(J4(VTSB)) = 0 V
±
200 mV
Observe
→
D1 (PG) ON, D2 (CHG) OFF
2.4.2
Charger Enable and Battery Detection
Connect JP1; Connect 2-3 of JP7 (Charger ON/MODE High)
Measure
Measure
→
V(J4(VTSB)) = 2.2 V
±
300 mV
Connect 2-3 of JP5 (Internal TS);
Adjust R6 until V(JP4-1) = 0.7 V
Adjust R6 until V(JP4-1) = 0.7 V
±
200 mV
Measure
→
V(J2(VBAT))=4.2 V
±
200 mV
Observe
→
D1 (PG) ON, D2 (CHG) OFF
2.4.3
Charge Current/Voltage Regulation
Reconnect LOAD#1. Turn on. Use the constant voltage mode.
Connect JP1; Set the output voltage to be 2.2 V.
Measure
Connect JP1; Set the output voltage to be 2.2 V.
Measure
→
I(J2(VBAT)) = 0.1 A
±
50 mA
Observe
→
D1 (PG) ON, D2 (CHG) ON
Increase the voltage of LOAD#1 to be 3.5 V.
Measure
Measure
→
I(J2(VBAT)) = 0.5 A
±
100 mA
Observe
→
D1 (PG) ON, D2 (CHG) ON
3
PCB Layout Guideline
1. It is critical that the exposed thermal pad on the backside of the bq24210 package be soldered to the
PCB ground. Ensure that sufficient thermal vias are right underneath the IC, connecting to the ground
plane on the other layers.
plane on the other layers.
2. Make the interconnections of the decoupling capacitors for VBUS, BATC to the IC as short as possible.
3. Use the EVM layout for design reference.
6
800-mA, Single-Input, Single-Cell, Li-Ion Battery Solar Charger With Power Path SLUU477A
–
December 2010
–
Revised August 2011
Copyright
©
2010
–
2011, Texas Instruments Incorporated