PT4557DESOG i...

  • 2022-09-24 20:26:29

PT4557DESOG is a high precision non-isolated step-down LED constant current driver chip

PT4557D is a high precision non-isolated step-down LED constant current driver chip. The chip works in quasi-resonant mode, suitable for the full range of 85Vac~265Vac

Input voltage non-isolated step-down LED constant current power supply.

PT4557D integrates 500V power MOS, high-voltage power supply circuit and sampling circuit on a single chip, without starting resistor and VDD capacitor, the system only needs

Few peripheral components are required, which greatly saves system cost and volume.

The PT4557D adopts a high-reliability constant current control method to achieve excellent linear regulation, load regulation and temperature characteristics. Output current mass production deviation

within +/-3%.

PT4557D provides complete protection functions: including LED short-circuit protection and over-temperature drop current protection.

PT4557D is packaged in SOP-7 and other packages

PT4557D? Features

? High-voltage single-chip integrated 500V power tube, high stability

? No startup resistor and VDD capacitor required

? Inductor current quasi-resonant mode (QR) to reduce switching losses

? Efficiency up to 93%_ ? +/-3% current accuracy

? Excellent line regulation, load regulation and temperature characteristics

? LED short circuit protection

? Over temperature drop current protection

? Support SOP-7 and other packages

PT4557D? Application

? LED candle light, bulb light? LED down light, fluorescent light? Other LED lighting