Lzc8650c Ic Datasheet Pdf May 2026

is a high-performance, single-stage primary-side offline LED driver controller manufactured by Lozen Technology (often labeled with the "LZ" brand). It integrates active Power Factor Correction (PFC) and operates in Quasi-Resonant (QR)

mode to achieve high efficiency and low electromagnetic interference (EMI). taoic.oss-cn-hangzhou.aliyuncs.com Key Specifications & Features : Offline AC/DC Flyback power converter for LED lighting. Power Factor : >0.95 at 230VAC. Total Harmonic Distortion (THD) : <10% at 230VAC. Startup Time : Quick start-up in less than 500ms. Efficiency

: Achieves high efficiency by eliminating secondary feedback components like opto-couplers. Protection Features

: Includes over-voltage protection (OVP), short LED protection, open LED protection, and over-temperature protection (OTP). „Mouser Electronics“ Lietuva Electrical Characteristics (Typical)

Based on the related LZC86xx series and industry standards for this IC: Supply Voltage ( cap V sub cap D cap D end-sub : Typically 9.5V to 27V. Operating Temperature : -40°C to +85°C ambient; junction up to 125°C. Gate Drive Output : Internally clamped at 16V to protect external MOSFETs. „Mouser Electronics“ Lietuva Pin Configuration (SOP-8 Package)

While specific LZC8650C pin maps are often proprietary, it generally follows the standard Lozen PSR layout used in the LZC8620 series : Loop compensation for constant current regulation. : Output diode zero current detection and voltage sensing. : Current sense pin for MOSFET current monitoring. : Power ground. : Totem-pole output to drive the external power MOSFET. : Power supply pin. : Temperature compensation point setting.

: Connects to an NTC resistor for temperature-based current compensation. Reference Documentation Direct Datasheet Information : You can view similar technical specifications on Prism Electronics or download the closely related LZC8620 Datasheet PDF Equivalent Replacement DIOO Microcircuits

is often cited as a functional equivalent with identical pinouts and electrical ratings. „Mouser Electronics“ Lietuva

(manufactured by Lozen Technology) is a high-performance, single-stage Primary Side Regulation (PSR) and Power Factor Correction (PFC) controller designed for LED lighting applications. It is widely used in offline AC/DC flyback and non-isolated Buck-Boost converters to achieve high efficiency and low cost by eliminating the need for an opto-coupler and secondary feedback. „Mouser Electronics“ Lietuva Key Specifications Operating Topology:

Supports both isolated Flyback and non-isolated Buck-Boost circuits. Power Factor: is greater than 0.95 at 230VAC with Total Harmonic Distortion (THD) Switching Mode: lzc8650c ic datasheet pdf

Operates in Quasi-Resonant Mode (QRM) to reduce MOSFET switching losses and improve efficiency. Supply Voltage ( cap V sub cap D cap D end-sub

Typical operating range is 9.5V to 27V, with an internal clamp at 16V for the gate driver. Startup Current: Extremely low, typically around „Mouser Electronics“ Lietuva Pin Configuration (SOP-8 Package) The LZC8650C typically comes in an 8-pin SOP-8 package: taoic.oss-cn-hangzhou.aliyuncs.com Description

Loop compensation for constant current and voltage control (connect RC network to ground).

Zero-current detection (ZCD) and over-voltage protection (OVP).

Current sense pin; monitors MOSFET current via a precision resistor. System and power ground.

Gate driver output for the external power MOSFET; clamped at 16V. Power supply input.

Over-temperature protection; sets the current foldback temperature point. Input line over-voltage protection. Protection Features Thermal Management:

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

over-voltage protection (typically 27V) and input line over-voltage protection. Safety Guards: System Impact: This reduces the Bill of Materials

Cycle-by-cycle current limiting on the CS pin and protection against output short circuits or open LED conditions. „Mouser Electronics“ Lietuva Documentation Links Full Datasheet (PDF): You can access the detailed LZC8650 Preliminary Datasheet via TaoIC. Alternative Source: A similar part, the DIO8650C Datasheet

, is available on Mouser for comparative performance metrics. „Mouser Electronics“ Lietuva or guidance on calculating the current-sense resistor values for your specific LED output?

The LZC8650C is a high-performance, single-stage flyback and Power Factor Correction (PFC) controller integrated circuit (IC) primarily designed for LED lighting applications. This IC is often utilized in high-power LED drivers (ranging from 45W to 110W) due to its efficiency and primary-side regulation (PSR) capabilities, which eliminate the need for secondary feedback circuits. Key Features and Benefits

The LZC8650C is engineered to simplify LED driver design while maintaining high reliability and safety.

Single-Stage PFC: Achieves a high power factor (typically >0.95) and low total harmonic distortion (THD <10%) in a single power stage.

Primary-Side Regulation (PSR): Controls output current accurately using information from the primary side, removing the need for an opto-coupler or secondary feedback components.

Quasi-Resonance (QR) Mode: Reduces switching losses in the MOSFET, leading to higher system efficiency.

Temperature Foldback: Features an integrated Over-Temperature Protection (OTP) that can fold back the output current based on temperature settings to prevent overheating.

Comprehensive Protection: Includes VDD over-voltage protection (OVP), cycle-by-cycle current limiting, output short-to-ground protection, and programmable input line OVP. Technical Specifications is a high-performance

According to preliminary datasheet data from TaoIC, the LZC8650C operates within the following parameters: Typical Value Range/Limit Supply Voltage (VDD) 18.1V – 21.5V (Turn-on) VDD Over-Voltage Protection Startup Current Low standby power Operating Current MOSFET Drive Voltage Internal clamp Junction Temperature -40°C to 125°C (Recommended) Pinout Configuration (8-Pin Package)

The LZC8650C is typically available in an 8-pin package (such as SOIC-8) with the following pin assignments:

CMP: Loop compensation; used for constant current and voltage control.

FB: Zero-crossing detection, line voltage compensation, and over-voltage protection.

CS: Current sense; monitors the voltage across the MOSFET's sense resistor. GND: System power ground. DRV: Gate driver output for the external MOSFET. VDD: Power supply input for the IC. OTP: Current foldback temperature point setting. OVP: Input line voltage over-voltage protection setting. Application Circuit Overview

In a typical application, the LZC8650C drives an external MOSFET in a flyback topology. The input AC voltage (often 85-300 VAC) is rectified, and the IC manages the switching to maintain a constant current output (e.g., 720mA or 750mA) for the LED string. Critical components like the 8N70 MOSFET and high-temperature electrolytic capacitors (e.g., 130°C rated) are commonly paired with this IC for robust industrial or commercial lighting solutions.

For detailed design and PCB layout guidelines, refer to the full datasheet at Mouser or Datasheet4U.

Step 2: Search Authorized Distributors

Major distributors like Mouser, Digi-Key, LCSC, or Newark often host datasheets directly from the manufacturer. Use their search bar with the exact part number. These PDFs are verified and virus-free.

C. Proprietary Control Algorithm

Unlike basic PWM controllers, the LZC8650C often employs a proprietary control loop (often Primary Side Regulation or PSR-optimized techniques). This allows the driver to maintain tight current regulation without requiring an optocoupler or a secondary-side feedback circuit.

• System Impact: This reduces the Bill of Materials (BOM) cost significantly and improves system reliability, as optocouplers are frequently the components that degrade fastest in high-temperature lighting environments.

1. Overview: The Role of the LZC8650C

The LZC8650C is typically categorized as a High-Precision LED Constant Current Driver IC. It is designed to operate in Buck, Buck-Boost, or other tapped-inductor topologies.

Unlike a simple linear regulator, the LZC8650C utilizes a high-frequency switching architecture. Its primary objective is to drive LED strings with a constant current regardless of input voltage fluctuations or changes in the LED string's forward voltage due to temperature. This ensures consistent luminosity and extends the lifespan of the LED emitters.