Texas Instruments bq24195/L, Руководство пользователя, Страница: 9 / 24

Boost Mode: Vbat = 3.7 V Vsw
Vprnid_AC coupled
C2
C1
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Test Summary
2.3.2.6 Switch to Boost Mode
1. Turn off and disconnect PS#1
2. If the constant voltage load connected from BAT+ to GND is not a four-quadrant supply (sources
current) remove the load and use the power source disconnected in step one, set to 3.7 V and 2 A
current limit and connect between BAT+ and GND
3. Apply 10 Ω (5 W or greater) across J5 (PMID(+) to GND(–)
4. Uncheck the OTG Low box in the GUI
5. Select OTG in the Configuration drop-down window
6. Verify V
PMID
to GND on J5 is between 4.9 V and 5.3 V
7. Verify scope measurement ( Figure 5 )
C1 (AC coupled 20 mV/div): Vac_PMID (TP20 to GND) – Ripple excluding high-frequency spikes
C2 (5 V/div): Vdc_SW (TP2) - Frequency between 1.2 MHz and 1.7 MHz, Duty cycle between 67%
and 74%
Figure 5. Boost Mode Ripple and Duty Cycle; V
BAT
= 3.7 V
2.3.2.7 Verify Device ID JEITA shown in software matches Table 4
Table 4. Device ID JEITA Settings
Assembly Number EVM Part Number Device ID JEITA
PWR193-001 bq24195LEVM-021 100 Disabled
PWR193-002 bq24195EVM-021 100 Disabled
9 SLUUA18 – October 2012 bq24195/L EVM (PWR193) User’s Guide
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