Lzc8650c Ic Datasheet Pdf -

When you finally open the LZC8650C IC datasheet PDF, pay close attention to these parameters:

| Parameter | Typical Value | Significance | |-----------|--------------|---------------| | Input Voltage | 4.5V – 40V | Determines battery or bus compatibility | | Output Current (max) | 1.5A (continuous), 2.5A (peak) | Defines LED load capability | | Switching Frequency | 500kHz ±15% | Impacts inductor and capacitor size | | Feedback Voltage | 0.1V or 0.2V | Low feedback reduces sense resistor loss | | DIM Pin Logic | 0.3V to 5V PWM | Allows microcontroller dimming | | Efficiency | Up to 95% | Reduces heat and extends battery life | | Thermal Shutdown | 150°C (typical) | Protects IC during overload |

Note: Always check the “Note” sections in the datasheet’s tables—they often contain critical usage conditions (e.g., “output current derating required above 50°C ambient”).

The LZC8650C is a Primary-Side Regulation (PSR) controller designed for offline AC/DC flyback power converters, specifically targeting LED lighting applications. Manufactured by Lozen Technology (菱奇半导体), this IC is known for achieving a high power factor and accurate real-current control. Technical Overview Package Type: SOP-8 (8-pin Surface Mount).

Application: High-power isolated LED drivers, typically used in LED bulbs and tube lighting.

Control Method: Primary-side modulation (PSR), which eliminates the need for an optocoupler and secondary-side control circuitry, reducing cost and size. Key Performance Specifications

Based on typical configurations for this series (including related models like DIO8650C or LZC8620): Supply Voltage ( VDDcap V sub cap D cap D end-sub ): Typically operates between 9.5V and 27V. Maximum VINcap V sub cap I cap N end-sub /Drive: Up to 33V.

Power Dissipation: Approximately 1.1W for the SOIC-8 package.

Thermal Resilience: Rated for junction temperatures from -40°C up to 125°C. Protection Features

The LZC8650C integrates several safety mechanisms to ensure driver longevity:

Input Protection: Over-voltage (OVP) and under-voltage (UVP) protection.

Thermal Management: Built-in hysteresis Over-Temperature Protection (OTP) and an output current foldback feature that reduces current as temperature rises.

Fault Protection: Output short-to-ground protection and cycle-by-cycle current limiting on the CS pin.

Temperature Compensation: Supports external NTC resistor connection for precise thermal adjustment. Pin Configuration (SOP-8) Description COMP Loop compensation for constant current regulation. FB Feedback pin; detects zero current to regulate output. CS lzc8650c ic datasheet pdf

Current sense pin; connects to a resistor to sense MOSFET current. GND Power ground. DRV

Gate drive output for the external power MOSFET (clamped at 16V). VDD Power supply input. TS Temperature compensation point setting. RN NTC resistor connection for thermal compensation.

For the full technical manual, you can view the LZC8620 series reference or check the manufacturer's product page at Lozenic.

The LZC8650C is versatile, supporting several topologies:

The datasheet provides reference designs for these topologies, including calculations for the inductor value ($L$) and the sense resistor ($R_cs$). For example, the output current is usually calculated using the formula:

$$ I_out \approx \fracV_refR_cs $$

Where $V_ref$ is the internal reference voltage defined in the datasheet.

The LZC8650C represents a class of driver ICs that balance cost-effectiveness with high-end performance. Its ability to deliver precise constant current without complex feedback loops makes it an ideal candidate for the mass production of LED tubes, bulbs, and panel lights.

For any design engineer looking to utilize this component, the LZC8650C datasheet PDF is the essential starting point. Mastery of its timing diagrams, thermal constraints, and protection logic is the difference between a prototype that works on a bench and a commercial product that survives years in the field.

(often branded under Lozen Technology ) is a primary-side control LED driver IC

designed to simplify the design of high-power-factor LED lighting. It is widely used in isolated Flyback and non-isolated Buck-Boost topologies, providing high efficiency by operating in Quasi-Resonant Mode (QRM) taoic.oss-cn-hangzhou.aliyuncs.com Core Functionality and Features

The LZC8650C is engineered to eliminate the need for secondary feedback components like opto-couplers, which significantly lowers system cost and complexity. „Mouser Electronics“ Lietuva Primary-Side Regulation (PSR):

Achieves accurate constant current control by monitoring information only from the primary side of the circuit. High Power Factor: When you finally open the LZC8650C IC datasheet

Typically achieves a power factor >0.95 and low Total Harmonic Distortion (THD < 10%) at standard AC voltages. Quasi-Resonant Mode (QRM):

The IC utilizes valley turn-on for the primary MOSFET, which reduces switching losses and EMI. Four-Segment Temperature Foldback:

This unique feature allows the IC to adjust the LED current based on the operating temperature, which can be configured via a single external resistor. Quick Start-up:

Designed for a fast start-up time (typically <500ms) with very low start-up current (15µA). „Mouser Electronics“ Lietuva Typical Applications

This IC is primarily targeted at commercial and residential LED lighting solutions, including: Isolated Flyback LED drivers. Non-isolated Buck-Boost LED power supplies.

High-efficiency PFC (Power Factor Correction) controllers for low-cost drivers. „Mouser Electronics“ Lietuva Protection Mechanisms

The LZC8650C includes a robust suite of safety features to ensure reliable operation under fault conditions: Over-Voltage Protection (OVP):

Includes both auxiliary winding and VDD secondary over-voltage protection. Short and Open LED Protection:

Automatically handles output short-to-ground or open-circuit states. Cycle-by-Cycle Current Limiting:

Protects the internal MOSFET by limiting the peak current during every switching cycle. Over-Temperature Protection (OTP): Built-in hysteresis prevents damage from thermal runaway. taoic.oss-cn-hangzhou.aliyuncs.com Technical Specifications Summary Description Package Types Often available in Start-up Current 15µA (typical). < 10% @ 230VAC. Topology Support Flyback, Buck-Boost. Control Method Primary Side Constant Current.

For detailed pinout diagrams and maximum stress ratings, you can reference the LZC8650C Chinese/English Datasheet or similar primary-side controllers like the which shares a near-identical application profile. „Mouser Electronics“ Lietuva schematic example for an isolated Flyback design using this IC?

The (also marketed under the brand DIOO as ) is a high-performance, single-stage LED driver IC designed for offline flyback power converters. It is widely used in LED lighting for its ability to provide high power factor (PF > 0.95) and low total harmonic distortion (THD < 10%). 🛠️ Key Technical Specifications

operates as a primary-side controller, meaning it does not require an opto-coupler for feedback, which simplifies design and reduces cost. The LZC8650C is a Primary-Side Regulation (PSR) controller

Input Voltage Range: Universal AC (typically 85V - 300V AC). Operating Voltage (VDD): 9.5V to 27V.

Switching Mode: Quasi-Resonant (QR) mode to reduce MOSFET switching losses. Start-up Current: Extremely low (15µA typical).

Protections: Built-in over-voltage (OVP), short-circuit, and over-temperature protection (OTP). 📍 Pinout Configuration (8-Pin SOP)

Based on common datasheet configurations for this series from Prism Electronics: Description 1 CMP Loop compensation for constant current regulation. 2 FB

Feedback pin; senses reflected voltage from auxiliary winding. 3 CS

Current sense pin; connects to a resistor to monitor MOSFET current. 4 GND Power Ground. 5 DRV Totem-pole output to drive the external power MOSFET. 6 VDD Power supply pin. 7 TS Temperature compensation point setting. 8 RN Connects to an NTC resistor for thermal management. 📄 Datasheet Resources

You can find detailed PDF versions and technical summaries through the following sources:

Official Summary: View specifications at Prism Electronics or IndiaMart Equivalent Model (

): A comprehensive technical datasheet is available via Mouser Electronics, which covers the exact same electrical characteristics and application circuits.

💡 Design Tip: When using this IC, ensure the CS resistor is sized correctly for your target output current, as this determines the primary-side peak current limit.

If you'd like, I can help you calculate the component values for a specific output wattage or troubleshoot a circuit that isn't starting up.

Here’s the best way to proceed:

Note: Pinouts may vary slightly by manufacturer revision. Always verify the physical datasheet.

| Pin Number | Pin Name | Description | | :--- | :--- | :--- | | 1 | VCC | Power supply input for the internal control logic. | | 2 | FB | Feedback loop input for output current regulation. | | 3 | COMP | Compensation pin for loop stability (error amplifier output). | | 4 | CS | Current Sense input for peak current limiting. | | 5 | GND | Ground. | | 6 | OUT | Gate driver output to drive the external MOSFET. | | 7 | NC | No Connect (reserved for spacing or future use). | | 8 | HV | High Voltage startup pin (connected to rectified line voltage). |