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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