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VGA charge PUMP inverter_TPS60403DBVR PowerDC Simulation have poblem

Leo Kuo
Prodigy 20 points
Other Parts Discussed in Thread: LM27761, TPS60403

Hi TI support team :

I have the VGA charge PUMP inverter design used " TPS60403DBVR ",
now my design run PowerDC Simulation have poblem

PL29=DC Host 5V
U68=TPS60403DBVR
U9= VGA Amplifiers LMH6738MQ

I setting U68 (TPS60403DBVR) DCR=15 ohm
when Host through U68 (TPS60403DBVR) dalta=1.3V
so voltage level from 5V drop to 3.59V to U9(VGA AMP)
so U68 & U9 Simulation result fail.

I have the question,
1. TPS60403DBVR DCR=15 is right or not?
2. This topology design to run DC power Simulation is right?

Leo
2023-03-16

  • 0
    TI__Mastermind 21560 points

    Hi Leo,

    The max output resistance of the TPS60403 should be 15Ohm from the datasheet spec. You can consider using LM27761 (Charge pump with integrated LDO) here as it has a lower output resistance and LDO dropout voltage compared to the TPS60403. You can check the output resistance vs load current in figure 19 of the datasheet.

    Best regards,

    Varun

  • 0 in reply to Varun John
    Prodigy 20 points

    Hi John :

    excuse me, so TPS60403 +5V input to Pin2, but it have voltage drop so Pin1 OUT , can't keep -5V level voltage output ?
    about my PI voltage drop issue did you have any solution or recommend ?

  • 0 in reply to Leo Kuo
    TI__Mastermind 21560 points

    Hi Leo,

    Yes you are correct, it won't be possible to get -5V with 60mA load current. The recommended solution is to use the LM27761 which has a lower output resistance. This will help reduce the voltage drop.

    Best regards,

    Varun