OB3605 High Current Precision, Non-Isolated Power Switch

OB3605Ax is a high current precision, non-isolated power switch for LED lighting. It works under transition mode. It significantly simplifies the LED lighting system design by eliminating the auxiliary winding inductance and works under low current. A 500V power switch is also integrated into the device. The LED current can be adjusted externally by the sense resistor Rcs at CS pin and high precision constant current regulation is realized. It integrates an external dimming pin which inputs PWM signal and can dim by changing the duty cycle of the PWM signal. OB3605Ax offers comprehensive protection coverage with auto-recovery features including LED string open protection, LED string short circuit protection, cycle-by-cycle current limiting, built-in leading edge blanking, VDD under voltage lockout (UVLO), Thermal foldback, etc OB3605Ax is offered in DIP7 /SOP7package

Key Features

• External PWM dimming
• High precision Constant Current Regulation at Universal AC input
• Sense and supply without auxiliary winding inductance
• Low System Cost and High Efficiency
• Low operation current
• Programmable CC Regulation
• Transition Mode operation
• Built-in Primary winding inductance compensation
• Programmable LED string open circuit protection
• LED string short circuit protection
• Cycle-by-Cycle Current Limiting
• Built-in Leading Edge Blanking (LEB)
• VDD Under Voltage Lockout with Hysteresis
• Thermal foldback

Applications

• LED lighting

Part Numbers and Specifications

Product family: On-Bright official page