The LZC8650C is a high-performance, isolated LED driver controller IC designed for offline AC-DC LED lighting applications. It is typically utilized in non-dimmable or dimmable LED bulb and tube light designs. The chip operates in Boundary Conduction Mode (BCM) or Critical Conduction Mode (CrM), offering a cost-effective solution for low-to-medium power LED drivers.
The device is engineered to provide high Power Factor Correction (PFC) and low Total Harmonic Distortion (THD), making it compliant with international lighting standards (such as ENERGY STAR and IEC 61000-3-2). Its ultra-low start-up current and proprietary control algorithms allow for high efficiency and reliable operation.
is a high-performance, single-stage Primary Side Regulation (PSR) LED driver controller designed by Lozen Technology
. It is widely used in high-efficiency LED lighting applications because it eliminates the need for secondary-side feedback components like opto-couplers. Key Features & Specifications
The LZC8650C is engineered for high-power LED drivers and offline flyback converters: High Power Factor: Typically achieves and low Total Harmonic Distortion ( Quasi-Resonant Mode (QRM):
Operates in QRM to minimize switching losses in the primary MOSFET, boosting overall efficiency. Temperature Foldback:
Features a unique four-stage temperature foldback function that protects the system by reducing output current as temperatures rise. Voltage Range:
Supports a wide input voltage range (e.g., 85–300 Vac) and provides accurate LED current control. Package Type: Available in a compact (8-pin) package. Typical Application Circuit & Pins
The IC is commonly used in isolated and non-isolated (Buck-Boost) topologies for LED lighting. Below are the standard pin functions: Description
Current sense; connects to the source of the primary switch. Loop compensation to stabilize the control loop. Zero-crossing detection and over-voltage protection. Power supply pin. Gate driver for the primary MOSFET. Not connected. Integrated Protections Input and output over-voltage and under-voltage protection. Short Circuit: Reliable output short-to-ground protection. Thermal Protection:
Includes built-in hysteresis Over-Temperature Protection (OTP).
For detailed technical specifications, you can often find the full datasheet from distributors like Prism Electronics or manufacturer portals such as Lozen Technology or more details on the temperature foldback configuration for this IC?
The is a high-performance, single-stage Power Factor Correction (PFC) controller and Primary Side Regulation (PSR) LED driver IC. It is widely used in offline AC/DC flyback power converters for LED lighting applications, such as floodlights and industrial automation. Key Features and Benefits
is designed to simplify LED driver circuits by eliminating the need for secondary-side feedback components like opto-couplers and TL431 regulators.
High Power Factor: Integrates active PFC to meet stringent power quality standards.
Primary Side Regulation (PSR): Accurately controls LED current using primary-side information, reducing overall system cost.
Quasi-Resonance Mode (QRM): Operates in QR mode to reduce MOSFET switching losses and improve efficiency.
Temperature Foldback: Features a unique output current foldback based on temperature, which protects the system by reducing current as heat increases.
Universal Input Support: Provides precise output current across a wide universal AC input range. Technical Specifications
According to the LZC8650 datasheet, here are the critical electrical parameters: Supply Voltage ( VDDcap V sub cap D cap D end-sub ): Typically operates between 9.5V and 27V. Startup Current: Ultra-low, typically around
Gate Driver Output: Internally clamped at 16V to protect external MOSFETs. Operating Temperature: -40∘Cnegative 40 raised to the composed with power cap C +85∘Cpositive 85 raised to the composed with power cap C (Ambient). Package Type: Commonly available in SOP8 (SOIC-8). Pin Configuration (SOP8) Description CMP Loop compensation for constant current/voltage regulation. FB Zero-crossing detection and over-voltage protection (OVP). CS lzc8650c ic datasheet pdf
Current sensing pin; monitors voltage across a high-precision resistor. GND System and power ground. DRV Totem-pole output to drive the external power MOSFET. VDD Main power supply for the IC. OTP Sets the temperature foldback point for thermal protection. OVP Input line voltage over-voltage protection. Protection Mechanisms
The IC includes a comprehensive suite of safety features to ensure reliability: Over-Voltage Protection (OVP): Integrated for both VDDcap V sub cap D cap D end-sub and output voltage.
Short Circuit Protection (SCP): Protects the output against GND shorts.
Cycle-by-Cycle Current Limiting: Monitors the CS pin to prevent over-current conditions in every switching cycle.
Hysteresis OTP: Built-in over-temperature protection with thermal hysteresis. Where to Download the Datasheet
You can find the full technical documentation for the LZC8650C at the following locations: LZC8650 Detailed Datasheet (PDF) Mouser - DIO8650C (Equivalent/Related Series) Prism Electronics Product Page
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.
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.
(often branded under Lozen Technology ) is a primary-side control LED driver IC The LZC8650C is a high-performance, isolated LED driver
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:
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 LZC8650C is a primary-side modulation isolated driver IC designed for efficient offline AC/DC flyback and Buck-Boost power converters, primarily used in LED lighting . It is manufactured by Lozen Technology (菱奇半导体) . Key Technical Specifications
According to the datasheet, the LZC8650C integrates advanced control strategies to maintain high current accuracy without secondary-side feedback components . Package: SOP8 (8-pin Surface Mount) .
Operating Mode: Quasi-Resonance (QR) mode, which reduces MOSFET switching losses . Operating Temperature: Recommended junction range of -40∘Cnegative 40 raised to the composed with power C 125∘C125 raised to the composed with power C Voltage Range: Typical supply voltage (VDD) from
Safety Isolation: Provides high power isolation to protect systems from electrical hazards . Core Features
Primary-Side Regulation (PSR): Eliminates the need for opto-couplers and secondary control circuits, simplifying the system design .
Active Power Factor Correction (PFC): Achieves a high power factor (PF > 0.95) for better energy efficiency . Common applications include:
Temperature Foldback: A unique four-stage temperature foldback function that can be programmed via a single external resistor to reduce current as temperature rises .
Line Voltage Compensation: Integrated valley detection and line compensation ensure precise output current across universal AC input ranges . Pinout Description (SOP8) Description CS
Current sense pin; detects source current and secondary short circuits . GND Ground pin . COMP
Loop compensation pin; requires an external RC network for stability . ZCS
Zero-crossing detection; also used for over-voltage protection (OVP) . VIN Power supply pin . DRV
Gate driver pin; connects to the gate of the primary MOSFET . Integrated Protection Mechanisms
The LZC8650C includes several safety features to enhance system reliability :
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 is a high-efficiency, step-down (buck) constant current LED driver 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:
Common applications include:
Without the LZC8650C IC datasheet PDF, designing a reliable circuit around this part is nearly impossible. The datasheet is the definitive authority on how the IC behaves under different operating conditions.
Stresses exceeding these ratings may cause permanent damage to the device.
| Parameter | Symbol | Value | Unit | | :--- | :--- | :--- | :--- | | VCC Supply Voltage | VCC | 30 | V | | Input Voltage (HV Pin) | V_HV | 600 | V | | Output Driver Voltage | V_OUT | 30 | V | | Operating Temperature | T_opr | -40 to +105 | °C | | Junction Temperature | T_j | +150 | °C |
(Note: Typical operating VCC range is roughly 10V to 25V. The device usually includes an internal Under-Voltage Lockout (UVLO) around 12V-14V).
Some unscrupulous sites offer a “datasheet” that is actually a one-page summary lacking key tables. If the PDF doesn’t include electrical characteristics or thermal data, it is not the full official version.
To understand the utility of the LZC8650C, one must look at its internal architecture as defined in the datasheet. The IC is typically housed in compact packages (such as SOP-8 or SOT-23-6 variants depending on the specific revision), allowing for high-density PCB layouts.