Current sense pin; connects to a resistor to sense MOSFET current. Power ground. DRV
The LZC8650C is primarily utilized in offline LED lighting fixtures, such as LED bulbs, downlights, and tube lights. It operates as a constant current controller, ensuring that the connected LEDs receive a stable current stream despite fluctuations in the input AC voltage. This stability maximizes LED lifespan and eliminates visible flicker. Key Features
| Pin | Name | Type | Description | | :-- | :--- | :--- | :--- | | 1 | CMP | I | Loop compensation for CC/CV control. Connect an RC network to ground. | | 2 | FB | I/O | Zero-crossing detection. Also integrates line compensation and over-voltage protection. | | 3 | CS | I | Current sense input. Monitors voltage across a resistor connected to the MOSFET source. | | 4 | GND | PWR | System ground and power ground. | | 5 | DRV | O | Gate driver output for the external MOSFET. Internally clamped at 16V. | | 6 | VDD | PWR | Power supply for the IC. | | 7 | OTP | I | Current fold-back temperature point setting. | | 8 | OVP | I | Input line over-voltage protection setting. |
[ AC Input: 85-300Vac ] ---> [ Bridge Rectifier / Pi-Filter ] | +-----+-----+ | | [Auxiliary Winding] [Primary Transformer Winding] | | [ LZC8650C Controller ] | [ External MOSFET (e.g., 8N70) ] - Pin 2 (FB) <-----------------+ | - Pin 5 (DRV) ---------------------------->+ - Pin 3 (CS) <-----------------------------+---> [ Sense Resistor ] ---> GND Typical Bill of Materials (BOM) Examples: 8N70 TO-220F Power MOSFET Surge Immunity: ≥is greater than or equal to 6 KV protection using high-capacity Varistors (MOV 10D621) lzc8650c ic datasheet pdf
The LZC8650C is engineered to simplify LED driver design while maintaining high reliability and safety.
Current sense pin; detects source current and secondary short circuits . Ground pin . COMP
The is a high-performance, single-stage LED driver integrated circuit (IC) designed primarily for high-power factor (PFC) LED lighting applications. It is frequently utilized in offline AC/DC flyback power converters to provide stable, constant-current regulation without the need for secondary-side feedback components, such as opto-couplers, which simplifies overall circuit design. Core Functionality and Design Current sense pin; connects to a resistor to
The value of the LZC8650C lies in its specific electrical characteristics. Below is an analysis of the critical parameters usually found in the PDF datasheet.
Standard drivers may have a current regulation tolerance of ±5% to ±10%. The LZC8650C is engineered for tighter tolerances, often specified at .
Feedback pin used to regulate output current via an optocoupler or auxiliary winding. It operates as a constant current controller, ensuring
The LZC8650C is part of a larger family of PSR controllers. If the LZC8650C is unavailable, the LC8680C from Lichip Micro is specified as a direct alternative, also in an SOP-8 package and supporting external MOSFET configurations. For lower power applications, the LZC8650 (base model) remains a viable option.
Key specifications often highlighted in its technical documentation include:
Provides precise output current across a wide universal AC input range. Technical Specifications
The is a highly integrated, high-efficiency LED driver integrated circuit (IC) designed for modern solid-state lighting applications. This article provides a comprehensive technical overview of its specifications, pin configuration, application circuits, and where to download the official PDF datasheet. Overview of the LZC8650C IC