Calculate the output voltage using the two resistors connected to pin 5 (FB). Formula: Vout = 0.6V (or 0.8V) * (1 + R1/R2) . This will tell you exactly what voltage the PT4554C is supposed to output.
With a tolerance up to 24V (and survival up to 40V load dump), this IC can handle 12V car batteries. Expect to see it in dashcams, GPS trackers, or LED interior strips. pt4554c
Protects the circuit if the LED load becomes open. Application & Circuit Design Calculate the output voltage using the two resistors
The PT4554C is designed to be compact, making it suitable for applications where space is limited. Its small footprint allows designers to create more compact and portable devices without compromising on power supply capabilities. With a tolerance up to 24V (and survival
Features a built-in 500V power MOSFET with an on-resistance (
The PT4554C is engineered to operate across a universal AC input range, making it suitable for global lighting applications. Supports 85Vac to 265Vac.
Includes LED short-circuit protection and over-temperature current reduction (throttling starts at ). Typical Pin Configuration The PT4554C is available in SOT33-4 and SOP-7 packages. HV: High-voltage power supply terminal. Drain: Built-in MOSFET drain. CS: Current sensing terminal. GND: Chip ground. Performance Example For typical applications using a 176Vac-264Vac input: 18W Output: Approximately 150V at 100mA. 12W Output: Approximately 72V at 150mA. 7W Output: Approximately 36V at 175mA.