power supply of non-dimming led bulb/ down light
input：230vac
output：72v/120ma
● ic：pt4554/pt4555/pt4556x/pt4557x/pt4558
● circuit topology: non-isolated voltage reduction
● ic characteristic: high voltage single core or multicore technology
● package: asop-7/asop-8/sop-7/sop-4
● solution characteristics: simplest circuit with no starting resistance and vdd capacitor, inductor current quasi-resonant (qr) work mode, excellent line regulation rate, load regulation rate and temperature characteristics; led short-circuit protection, over temperature and current reduction protection, etc.
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