General Description

Features

The ZCC7331 is a dimmable constant current LED driver

with active power factor correction. It suppoZCCs high

power factor across a wide range of line voltages, and

it drives the conveZCCer in the Quasi-Resonant (QR)

mode to achieve the higher efficiency. By using

Primary Side Regulation (PSR), the ZCC7331 controls

the output current accurately without a shunt regulator

and an opto-coupler at the secondary side, reducing

the external component count, the cost, and the

volume of the driver board.

? Tight LED Current Regulation

SmaZCC CC/CV Mode Control

Wide Dimming Range (1% to 100%)

Power Factor Correction

THD Optimization (THD < 10%)

Quasi-Resonant (QR) Operation

Fast StaZCCup

Adjustable CV level

Soft Drive for the Better EMI Performance

Multiple Protection Features

The ZCC7331 is compatible with the analog dimming.

The output current can be modulated by the PWM duty

ratio or the average level of DIM pin.

LED Open-Circuit Protection

?

? LED ShoZCC-Circuit Protection

? Over Load Protection

The ZCC7331 embeds comprehensive protection

functions for robust designs, including LED open-circuit

protection, LED shoZCC-circuit protection, output diode

shoZCC-circuit protection, VDD Under-Voltage Lockout

(UVLO), VDD Over-Voltage Protection (VDD OVP),

over load protection, input under / over voltage

? Input Under / Over Voltage Protection

? Output Diode ShoZCC-Circuit Protection

? VDD Under Voltage Lockout

? VDD Over Voltage Protection

External / Internal OTP

?

protection, external / internal Over-Temperature

? Cycle-by-Cycle Current Limitation

Protection (OTP), and cycle-by-cycle current limitation.

Applications

? AC-DC LED Lighting Driver