OB3600

GENERAL DESCRIPTION

OB3600 is a dimmable, highly integrated buck regulator with advanced features to provide high efficiency control and high precision constant current output for LED lighting applications.

Proprietary Constant Voltage (CV) and Constant Current (CC) control is integrated as shown in the figure below.

The LED current (CC control) can be adjusted externally by the resistor Rs at CS pin.

OB3600 offers a dimmable function, the LED current can be controlled by setting the duty cycle of PWM waveform into the DC pin.

OB3600 offers comprehensive protection coverage with auto-recovery features including Cycle-by-Cycle current limiting, VDD OVP and UVLO. Excellent EMI performance is achieved with On-Bright proprietary frequency shuffling technique.

OB3600 is offered in SOP8 package.

Fig.1. Typical CC/CV Curve

FEATURES

n  High Precise Constant Current Regulation at Universal AC input

n  Dimmable LED Current Control

n  Quasi-Resonant operation

n  Adjustable Constant Current, Constant Voltage

n  Built-in Primary winding inductance compensation

n  LED short circuit protection

n  Built-in Leading Edge Blanking (LEB)

n  Cycle-by-Cycle Current Limiting

n  VDD Under Voltage Lockout with Hysteresis (UVLO)

n  Latched over temperature protection (OTP)

n  VDD OVP

 

APPLICATIONS

n  Dimmable LED lighting

 

 

TYPICAL APPLICATION