● 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.