SD6835 DIP-8 Silan AC-DC Switching Power PWM+PFM Controller IC

SD6835 Product Overview
SD6835 is a current-mode PWM+PFM power controller IC manufactured by Silan Microelectronics, packaged in DIP-8 through-hole. It integrates a 650V high-voltage MOSFET for flyback & forward switching power supplies. It features low startup current and ultra-low standby power with frequency jitter to reduce EMI, ideal for 12~20W adapters and low-power SMPS projects.

SD6835 Key Features

The SD6835 integrates a peak current compensation circuit that maintains a stable peak current limit across different AC input voltages. A built-in output power limiting compensation circuit balances the limited output power under varying AC input voltages. A built-in slope compensation circuit accommodates a wider range of transformer applications. The maximum peak current compensation at power-up reduces transformer stress and prevents saturation. The output current limit can be adjusted via a resistor connected to the CS pin.

The controller integrates multiple protection features including UVLO, OVP, OLP, leading-edge blanking, and thermal shutdown. Upon a protection event, the circuit auto-restarts until normal operation is restored. Cycle-by-cycle current limiting ensures the current does not exceed the set value in each switching cycle.

SD6835 Application Scenarios
Power adapters, battery chargers, DVD & set-top box power supplies, small home appliance power modules, LED drivers, industrial low-power SMPS, CCTV camera power supplies.

SD6835 Advantages

High Integration Simplifies Peripheral Circuits: The SD6835 integrates a high-voltage MOSFET and optimized gate driver, combining the controller and power switch in a single DIP-8 chip with fewer external components required.

Ultra-Low Standby Power, Energy Star 2.0 Compliant: Startup current is only 4µA, and the circuit enters Burst Mode in standby to reduce standby power consumption, compliant with Energy Star 2.0.

Frequency Jitter Reduces EMI: Switching frequency varies from 25 to 67kHz based on load, with frequency jitter to effectively reduce electromagnetic interference (EMI).

Comprehensive Protection: Integrated UVLO, OVP, OLP, leading-edge blanking, and thermal shutdown protect the system. Auto-restart after protection events until normal operation is restored.

Flexible Current Limit Adjustment: The output current limit can be adjusted via a resistor connected to the CS pin, meeting design requirements for different power levels.

Wide Input Voltage Adaptability: Built-in peak current compensation and output power limiting compensation circuits maintain stable peak current limit and output power across different AC input voltages.

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FAQs:

1. What is the SD6835 chip?
   It is a current-mode PWM+PFM controller from Silan Microelectronics with a built-in 650V high-voltage MOSFET, designed for Switch Mode Power Supply (SMPS) applications with an external sense resistor, suitable for flyback and forward topologies.

2. What are the core specifications?
   Supply voltage 8.5V to 28V, output current 7A, switching frequency 25kHz to 67kHz, maximum duty cycle 82%, power dissipation 6.3W, operating temperature -25°C to +85°C.

3. What package does it use?
   It uses a standard DIP-8 through-hole package.

4. What is the voltage rating of the built-in MOSFET?
   The built-in high-voltage MOSFET has a drain-source breakdown voltage of 650V.

5. How is the startup current and standby power consumption?
   The startup current is extremely low at approximately 4µA. In standby mode, the circuit automatically enters burst mode to effectively reduce standby power consumption.