Texas Instruments bq24195/L, Руководство пользователя, Страница: 8 / 24

CHG Mode: Vbus = 5 V Vbat = 3.7 V Vsw
Vpmid_AC coupled
Vsys_AC coupled
C2
C1
C3
Test Summary
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2.3.2.3 Increase the Constant Voltage Load to 3.7 V
DC
Measure → V(J2(SYS), J2(GND)) = 3.75 V ±200 mV
Measure → IBAT = 500 mA ±200 mA
Measure → V(J2(BAT), J2(GND)) = 3.7 V ±200 mV
2.3.2.4 In the software, set Fast Charge Current, ICHG to 1.012 A
Measure → I
IN
= 500 mA ±200 mA
2.3.2.5 Verify Scope Measurements (See Figure 4 – 500 ns/div)
C1 (AC coupled 20 mV/div): Vac_PMID (TP20 to GND) – Ripple excluding high frequency spikes < 10 mV
C2 (5 V/div): Vdc_SW (TP2) - Frequency between 1.25 MHz and 1.5 MHz, duty cycle between 73% and
81%
C3 (AC coupled 20 mV/div): Vac_VSYS (TP3 to GND) - excluding high frequency spikes < 15 mV
Figure 4. CHG Mode Ripple and Duty Cycle: V
BUS
= 5 V, V
BAT
= 3.7 V
8 bq24195/L EVM (PWR193) User’s Guide SLUUA18 – October 2012
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