LTC3638 in the Output Voltage Programming mode

Question

Hi, 
 
 I have designed an electronic circuit and am using the LTC3638 in the Output Voltage Programming mode.

The circuit and configure so that it operates a 120 AVC at the input and 11 volts at the output. May I have problems the circuit works fine when I apply 120v on the input and have 10.98volts on the output. The problem is when I apply a load which is a single LED the circuit stops working and I have to replace the LTC3638.

See the schematic

Thank you for your help! 
 
 Chris

Fil · Accepted Answer

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Chaz · Answer

Hi, 
 LTC3638's absolute maximum input voltage rating is 140V (DC). Make sure Vin is always below this voltage. 140VAC input is too high (about 200VDC pp). Even 120VAC is too high (about 170VDC pp). Higher than spec Vin will damage the converter. 
 Thanks.

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LTC3638 in the Output Voltage Programming mode

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