深圳市瑞新盛科技有限公司
深圳市瑞新盛科技有限公司
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RT7304AGE台湾立锜优势库存供应

    General Description

    The RT7304A is a constant current LED driver with

    active power factor correction. It supports high power

    factor across a wide range of line voltages, and it drives

    the converter in the Quasi-Resonant (QR) mode to

    achieve higher efficiency. By using Primary Side

    Regulation (PSR), the RT7304A 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.

    The RT7304A embeds comprehensive protection

    functions for robust designs, including LED open-circuit

    protection, LED short-circuit protection, output diode

    short-circuit protection, VDD Under-Voltage Lockout

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

    Over-Temperature Protection (OTP), and cycle-by-cycle

    current limitation.

    RT7304AGE台湾立锜优势库存供应

    Features

     Tight LED Current Regulation

     No Opto-Coupler and TL431 Required

     Power Factor Correction (PFC)

     Quasi-Resonant

     Maximum/Minimum Switching Frequency

    Clamping

     Maximum/Minimum on-Time Limitation

     Wide VDD Range (up to 34V)

     THD Optimization

     Input-Voltage Feed-Forward Compensation

     Multiple Protection Features

     LED Open-Circuit Protection

     LED Short-Circuit Protection

     Output Diode Short-Circuit Protection

     VDD Under-Voltage Lockout

     VDD Over-Voltage Protection

     Over-Temperature Protection

     Cycle-by-Cycle Current Limitation

    Applications

     AC/DC LED Lighting Driver

    Operation

    Critical-Conduction Mode (CRM) with Constant

    On-Time Control

    Figure 1 shows a typical flyback converter with input

    voltage (VIN). When main switch Q1 is turned on with a

    fixed on-time (tON), the peak current (IL_PK) of the

    magnetic inductor (Lm) can be calculated by the following

    equation :

    RT7304AGE台湾立锜优势库存供应

    IOUT NP:NS IL

    Lm

    Figure 1. Typical Flyback Converter

    If the input voltage is the output voltage of the

    full-bridge rectifier with sinusoidal input voltage

    (VIN_PKsin()), the inductor peak current (IL_PK) can be

    expressed as the following equation :

    IN_PK ON

    When the converter operates in CRM with constant

    on-time control, the envelope of the peak inductor current

    will follow the input voltage waveform with in-phase. Thus,

    high power factor can be achieved, as shown in Figure 2


[发布时间:2019/6/19 16:51:00]

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