MT7933

Features

MT7933 is a single-stage, high power factor, primary-side controlled AC-to-DC LED driver chip. MT7933 integrates on-chip power factor correction (PFC) function and operates in critical conduction mode to achieve high power factor and reduce power MOS tube switching losses. Using MAXIC's unique control technology (patent applied for), the LED current can be accurately modulated without optocouplers and secondary-side sensing devices.

MT7933 also implements various protection functions, including over-current protection (OCP), over-voltage protection (OVP), short-circuit protection (SCP) and over-temperature protection (OTP), to ensure reliable operation of the system.

Parameters

. Single-stage active PFC achieves high power factor and low THD

. Primary side sensing mechanism, no optocoupler required

. High precision LED current (+/-3%)

. Critical Conduction Mode Operation

. Up to 60W driving capability

. Cycle-by-cycle peak current control

. Built-in undervoltage lockout protection, VDD overvoltage protection, output overvoltage protection

. Adjustable constant current output current and output power

. With soft start function

. SOT23-6 package

Description: External MOS

Vin(V)：85～264VAC

Maximum driving capability: 80W

Power factor: >0.9

Dimming method: N/A

Application

Bulb, fluorescent lamp, downlight