RT7331-ZCC7331替代RT7331

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 Drive