PT4115 High Brightness LED Driver: 30A, 1.2V Step-down Driver, Equivalent and Pinout

The PT4115 is an inductive step-down high brightness driver with a continuous conduction mode that is designed to efficiently drive single or multiple series linked LEDs from a voltage source higher than the total LED chain voltage.

The device is powered by a 6V to 30V input source and has a 1.2A output current that may be adjusted externally. The PT4115 may produce more than 30 watts of output power depending on the input voltage and additional components.

The PT4115 has a dedicated DIM input that receives either a DC voltage or a wide range of pulsed dimming, as well as a high-side output current detecting circuit that employs an external resistor to adjust the nominal average output current,  When you provide a voltage of 0.3V or less to the DIM pin, the output is turned off and the device enters a low-current standby mode.

PT4115 Pinout

PT4115 Symbol

PT4115 Footprint

The PT4115 Simplified Block Diagram is as follow

PT4115 Simplified Block Diagram

• Simple low parts count

• Wide input voltage range: 6V to 50V

• High efficiency (up to 97%)

• Up to 1.5A output current 

• Single pinon/off and brightness control using DC voltage or PWM

• Up to 1MHz switching frequency

• Typical 3% output current  accuracy

• Inherent open-circuit LED protection

• Inherent Rcs open protection

• High-Side Current Sense

• Hysteretic Control: No need for compensation

• Adjustable Constant LED Current

• Thermal shutdown

• LED back-up lighting

• Illuminated signs

• SELV lighting

• Low voltage halogen replacement LEDs 

• Automotive lighting

• Low voltage industrial lighting

• LCD TV backlighting

PT4115 1W Application Circuit

PT4115 3W Application Circuit

RTS6700, IFR 4000, STR 6553, PM554, JE1100

The PT4115 includes the power switch and a high-side output current sensing circuit, which uses an external resistor to set the nominal average output current.  and a dedicated DIM input accepts either a DC voltage or a wide range of pulsed dimming. Applying a voltage of 0.3V or lower to the DIM pin turns the output off and switches the device into a low current standby state.

PT4115 Package Outline

Youtai Semiconductor Co., Ltd. is an integrated high-tech enterprise specializing in the design, manufacture, and sales of integrated circuits and semiconductor discrete devices. Founded in 2009, the company is a Sino-Taiwan joint venture with a production base located in Pingshan New District, Shenzhen.