Texas Instruments BQ24296M, User Manual

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Test Summary
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Click the Read button twice
Observe → Everything normal at FAULT box
Observe → D3 (STAT) is on
Observe → D4 (PG) is on
Step 2. Enable Load #1 from Section 2.2 , step 4. Measure the voltage across J3 and J4 as follows:
Measure → V(J3(SYS), J3(GND)) = 3.65 V ±300 mV
Measure → V(J4(BAT), J4(GND)) = 2.5 V ±200 mV
Step 3. Increase the constant voltage load to 3.7 V
DC
Measure → V(J3(SYS), J3(GND)) = 3.75 V ±200 mV
Measure → IBAT = 500 mA ±200 mA
Measure → V(J4(BAT), J4(GND)) = 3.7 V ±200 mV
Step 4. In the software, set Fast Charge Current , ICHG to 1024 mA
Measure
→
I
IN
= 500 mA ±200 mA
Step 5. Verify scope measurements (See Figure 5 – 500 ns/div)
C1 (AC coupled 20 mV/div): Vac_PMID (TP2 to GND) – Ripple excluding high frequency
spikes < 10 mV
C2 (5 V/div): Vdc_SW (TP1) – Frequency between 1.25 MHz and 1.5 MHz, duty cycle
between 73% and 81%
C3 (AC coupled, 20 mV/div): Vac_VSYS (TP4 to GND) – Excluding high frequency spikes <
15 mV
Figure 5. CHG Mode Ripple and Duty Cycle: V
BUS
= 5 V, V
BAT
= 3.7 V
8 bq24296M and bq24298 EVM (PWR655) User’s Guide SLUUB62A – August 2014 – Revised March 2015
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