## Technical Overview: TS19702CX6-RFG The **TS19702CX6-RFG** is a high-efficiency, constant current LED driver controller manufactured by **Taiwan Semiconductor**. It is specifically designed for high-performance LED lighting applications, particularly those requiring power factor correction (PFC) and dimming capabilities. --- ### 1. Key Technical Specifications The following table summarizes the primary electrical characteristics of the device: | Parameter | Specification | | :--- | :--- | | **Package Type** | SOT-26 | | **Input Voltage Range (Vcc)** | 10V to 27V | | **Topology** | Boundary Conduction Mode (BCM) | | **Function** | PFC + Constant Current Controller | | **Operating Temperature** | -40°C to +125°C | | **Protection Features** | OVP, OCP, OTP, LED Open/Short | --- ### 2. Functional Electronic Components The internal circuitry of the TS19702CX6-RFG includes several critical blocks that manage power delivery: * **PFC Controller:** Uses a proprietary control method to achieve a high Power Factor (typically >0.9) and low Total Harmonic Distortion (THD), ensuring compliance with international energy standards. * **Boundary Conduction Mode (BCM):** The device operates at the edge of continuous and discontinuous conduction. This reduces switching losses and improves electromagnetic interference (EMI) performance. * **Internal Start-up Circuit:** Minimizes the need for external high-voltage resistors, reducing standby power consumption. * **Gate Driver:** An integrated driver capable of switching external N-channel MOSFETs efficiently. --- ### 3. Application Circuit Example A typical implementation involves a Buck-Boost or Flyback topology. Below is a simplified representation of the pin functions: ```c // Pin Configuration for TS19702CX6 (SOT-26) Pin 1: VCC // Power supply input Pin 2: GND // Ground Pin 3: OUT // Gate driver output for external MOSFET Pin 4: CS // Current sense input Pin 5: ZCD // Zero current detection (demagnetization) Pin 6: COMP // Compensation pin for feedback loop ``` --- ### 4. Primary Features 1. **Tight Current Regulation:** Ensures uniform brightness across LED strings by maintaining a precise output current (within ±3%). 2. **Low Start-up Current:** Typically around 25µA, allowing for fast start-up times even with high-impedance resistors. 3. **Comprehensive Protection:** * **Cycle-by-Cycle Current Limiting:** Protects the MOSFET from saturation. * **Over-Voltage Protection (OVP):** Prevents damage if the LED load becomes disconnected (open circuit). * **Thermal Shutdown:** Reduces output current or shuts down if the chip exceeds safe temperature limits. --- ### 5. Common Usage Cases * LED Bulbs (A19, GU10). * LED Downlights and Tube lights. * Commercial and Industrial lighting fixtures requiring PFC.