RT7304 Perfect over 3C/CE certified active primary side PFC isolation constant current scheme

• RT7304 Active power factor QQ2892715427 correction capability LED Driver
  
• Accurate LED Current output
• No need to use optocouplers and TL431
• Power factor correction
• Quasi-resonant technology
• Maximum/minimum operating frequency limit
• Maximum/minimum on-time limit
• Wide VDD voltage range (up to 25V)
• Multiple protection features
  ? LED Open Circuit protection
  ? LED Short Circuit protection
  ? output diode short-circuit protection
  ? VDD Undervoltage Lockout protection
  ? VDD Over-voltage protection
  ? Over-temperature protection
  Cycle Current Limit
• RoHS compliant, halogen-free

The RT7304 is an LED constant current driver with active PFC capability, which achieves high power factor over the full voltage range and enables the converter to operate in quasi-resonant mode for high conversion efficiency. Due to the use of the original edge adjustment technology, no shunt regulator and Optocoupler are used on the two-RT7304, the output current can be precisely controlled with the use of the unit, reducing the number and cost of components, and the volume of the drive circuit is reduced. A variety of protection features are built into the RT7304 to enhance the stability of the design, including LED open-circuit protection, short-circuit protection, VDD undervoltage lockout protection, overvoltage protection, overtemperature protection, and cycle-by-period current limit protection.

Applications
LED illumination driver for AC input
Isolated type ac/cc
Non-isolated AC/CC

The RT7304 provides a robust design with comprehensive protection features including led open-circuit protection, led short-circuiting protection, output diode short-circuit protection, VDD-owed

Voltage lockout (UVLO), Vdd overvoltage Protection (VDD OVP), overtemperature Protection (OTP), and cycle-by-period current limit. RT7304 uses cost-effective sot-23-6 seal

Mount

Design Specification Requirements:

Input range: 90V ~% VAC

LED Load: 45v/400ma

At 120v/230 V, efficiency > 85%
Ac

Pf:> 0.95 and Thdi < 15% (compliant with iec61000-3-2 C & D)

Step 1, input and output conditions

The input and output conditions are listed as follows:

Maximum AC input voltage Vac_max, 264VAC

Minimum AC input voltage vac_min, 90VAC

Power frequency Fline, 50hz/60hz

Average output current I, 400mA

RT7304 Perfect over 3C/CE certified active primary side PFC isolation constant current scheme