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Part Number: TPS61087
Recently, I designed a boost circuit which is 5V input, 11.7V/600mA output which using TPS61087.
During testing, the output voltage, SW voltage and the L current is beautiful at 100mA/300mA/600mA output. But when the load goes up to 700mA, the IC broken. SW shorted to Ground. I changed the diode from BA260A to SL22 which can increase the output power. The output current can achieve to 740mA. But when the load goes high to 750mA, IC broken.
I also tested TPS61087 demo, when the output current 750mA, the IC broken too. Before broken, peak inductor current hasn't catch the MOSFET current limit.
Could you please help me check what the root cause of the broken? Thanks.
Did you catch the waveform of the inductor current? And did you catch the SW voltage spike during test especially at the 600mA-700mA condition? if the Vin is ≥5V, it should be OK for the 5Vin/11.7V 700mA output.
Boost DC/DC Solution
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In reply to Helen chen:
In reply to Martin Wen82:
What is the input voltage? did you test the input voltage at the TPS61087's input cap? Is it 5V or much lower than 5V?
The on board test is OK. It is OK to output 12V/800mA at Vin=5V condition. Note: this 5V is on board voltage, not the power supply output voltage.
During my test, when Vin=5V, Vo=11.7V, Iomax=1.1A.when Io>1.1A, the output voltage begin drop, it enters into the current limit mode.
Thanks for the update. So this post can be closed!
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