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Part Number: TPS61232
When power off sequence for TPS61232 (and TLV62080) power line, TPS61232 and one of TLV62080 Vout are unstable.
Please let me know about the reason of unstable power down and any idea for proposed measure.
・Power line is attached below block diagram;
・TPS61232 schematic and waveform is attached below
・When TPS61232 set hysteresis, 1.8Vout line was clear. ※Vin_off = 2.4V, Vin_on = 3.5V
But TPS61232 Vout is not clear.
Best RegardsJasper LiBoost Converter Solution
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In reply to Jasper Li:
In reply to Satoshi:
I got waveform of EN with hysteresis version, please see attached below.
※Both voltage scale are 1V/div, time scale is 10ms/div and 1.4ms/div(zoom).
If there any noticed point, please let me know.
Thank you for advice, I attached waveform with Switching voltage below,
By the way, Cin added 22.6μF to 47μF ×2, I look like Vout swing became large.
Is this result any hint to you?
I guess that TPS61232 power off problem is influence by switching Zero Duty Cycle mode to PWM mode.
Could you please let me know what you think about my guess?
Satoshi-san Sorry, but i'm not agree with you. We can see from the waveform that the TPS61232 has stop switching when the VIN is lower than the setting voltage. This is why we see the VOUT decreases. And the voltage in SW pin is equal to VIN after the TPS61232 stops switching. As the SW voltage is lower than VOUT after the SW not switching, the ramp up of the VOUT is not caused by the TPS61232, but the energy from somewhere in your system connected to VOUT pin. please help to check what is connected to the VOUT of the TPS61232
5Vout line is update, please see below,
※Sorry, previous customer block diagram is mistaken, below is correct.
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