Lzc8650c - Ic Datasheet Pdf

Zero-Crossing Detection pin. Senses inductor current zero-crossing via an auxiliary winding resistor divider. Also handles over-voltage protection (OVP). VIN / VDD

When the output terminal is directly shorted, the auxiliary winding voltage drops below the functional threshold. The IC drops into hiccup mode, continuously attempting a safe, low-power restart until the physical short is removed.

Pin 8 acts as a guard against primary AC surges. If the line voltage rises past safe operational thresholds, it cuts off the driver stage until safe operating bounds resume. Typical Application Circuit and Design Guide

Current Sense pin. Connects to the source of the primary MOSFET via a sense resistor to provide cycle-by-cycle current limiting. NC / OVP lzc8650c ic datasheet pdf

Unlike standard ICs that abruptly shut off when hot, the LZC8650C uses the OTP pin connected to an NTC resistor. When the temperature hits the foldback point ( TZFcap T sub cap Z cap F end-sub

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What is your target and LED load voltage ? Zero-Crossing Detection pin

Rather than shutting down completely during an over-temperature condition, the LZC8650C features a smooth via Pin 7. When the system temperature hits a specific threshold (e.g., 123∘C123 raised to the composed with power cap C 145∘C145 raised to the composed with power cap C

These inputs have high impedance and are vulnerable to stray electromagnetic pickup. Keep traces running from the sense resistors to Pins 1 and 4 as brief as possible, and route them far away from the noisy drain node of the MOSFET.

The LZC8650C operates in , a control method that significantly reduces switching losses in the external power MOSFET, thereby enhancing system efficiency. Its primary side regulation (PSR) technology allows for precise control of the LED current based solely on information from the primary side of the transformer. VIN / VDD When the output terminal is

AC Input Line ----[ Rectifier Bridge ]----+------------- [ Transformer Primary ] ----( Drain ) | | [Start-up Resistor] [ Power MOSFET ] | | +----> VCC (Pin 8) ( Source ) --- [CS Resistor] ---> GND 1. Start-Up Sequence

Integrated four-stage temperature foldback function to protect the IC by reducing current as temperature rises. Voltage Protection: cap V sub cap D cap D end-sub

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The LZC8650C is a or a DC-DC converter , depending on the specific manufacturer’s variant. While multiple semiconductor companies produce 8650-series ICs (e.g., LX, LZ, or similar prefixes), the LZC8650C is typically characterized by: