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BQ24725ARGRR Datasheet(PDF) 33 Page - Texas Instruments |
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BQ24725ARGRR Datasheet(HTML) 33 Page - Texas Instruments |
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33 / 47 page  PHASE Battery Adapter ACP ACN R AC BTST REGN High-Side MOSFET Low-Side MOSFET CLR Count to 7 Adapter Plug in R DC L Latch off Charger SCP1 SCP2 COMP1 COMP2 R PCB C R1(2010) 2 C1 2.2 F D1 C2 0.47-1 F R2(1206) 10-20 Adapter connector VCC pin bq24725A www.ti.com SLUSAL0A – SEPTEMBER 2011 – REVISED AUGUST 2014 Figure 19. Input Filter 9.2.2.9 bq24725A Design Guideline The bq24725A has a unique short circuit protection feature. Its cycle-by-cycle current monitoring feature is achieved through monitoring the voltage drop across RDS(on) of the MOSFETs after a certain amount of blanking time. For a MOSFET short or inductor short circuit, the over current condition is sensed by two comparators, and two counters are triggered. After seven occurrences of a short circuit event, the charger will be latched off. To reset the charger from latch-off status, reconnect the adapter. Figure 20 shows the bq24725A short circuit protection block diagram. Figure 20. Block Diagram of bq24725A Short Circuit Protection In normal operation, the low side MOSFET current is from source to drain which generates a negative voltage drop when it turns on, as a result the over current comparator can not be triggered. When the high side switch short circuit or inductor short circuit happens, the large current of low side MOSFET is from drain to source and can trig low side switch over current comparator. bq24725A senses the low side switch voltage drop through the PHASE pin and GND pin. The high-side FET short is detected by monitoring the voltage drop between ACP and PHASE. As a result, it not only monitors the high side switch voltage drop, but also the adapter sensing resistor voltage drop and PCB trace voltage drop from ACN terminal of RAC to charger high side switch drain. Usually, there is a long trance between input sensing resistor and charger converting input, a careful layout will minimize the trace effect. Copyright © 2011–2014, Texas Instruments Incorporated Submit Documentation Feedback 33 Product Folder Links: bq24725A |
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