Low Cost Green-Mode PWM Controller
SG6859A — Low Cost, Green-Mode PWM Controller for Flyback Converters
SG6859A
Low-Cost, Green-Mode PWM Controller for Fl...
Description
SG6859A — Low Cost, Green-Mode PWM Controller for Flyback Converters
SG6859A
Low-Cost, Green-Mode PWM Controller for Flyback Converters
Features
Green-Mode PWM Supports the “Blue Angel” Standard Low Startup Current: 9 μA Low Operating Current: 3 mA 300 mA Driving Capability Leading-Edge Blanking Constant Output Power Limit Universal Input Built-in Synchronized Slope Compensation Current-Mode Operation Cycle-by-cycle Current Limiting Under-Voltage Lockout (UVLO) Programmable PWM Frequency with Frequency
Hopping
VDD Over-Voltage Protection (Auto Restart) Gate Output Voltage Clamped at 17 V Low Cost Few External Components Required Small SOT23-6L Package
Description
This highly integrated PWM controller provides several enhancements designed to meet the low standby-power needs of low-power SMPS. To minimize standby power consumption, the proprietary green-mode function provides off-time modulation to linearly decrease the switching frequency under light-load conditions. This green-mode function enables the power supply to meet even the strictest power conservation requirements.
The BiCMOS fabrication process enables reducing the startup current to 9 μA and the operating current to 3 mA. To further improve power conservation, a large startup resistance can be used. Built-in synchronized slope compensation ensures the stability of peak current mode control. Proprietary internal compensation provides a constant output power limit over a univer...
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