Pt4115 Schaltung. Pt4115e 50v 1 5a step down high brightness led driver r s cr powtech shanghai co ltd. The rs resistor is calculated using this formula.
The dim pin can be driven by an external dc voltage. The pt4115 is a continuous conduction mode inductive step down converter designed for driving single or multiple series connected led efficiently from a voltage source higher than the total led chain voltage the device operates from an input supply between 6v and 30v and provides an externally adjustable output current of up to 1 2a. 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.
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.
The pt4115 is a continuous conduction mode inductive step down converter designed for driving single or multiple series connected led efficiently from a voltage source higher than the total led chain voltage the device operates from an input supply between 6v and 30v and provides an externally adjustable output current of up to 1 2a. 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. The frequency of pwm dimming ranges from 100hz to more than 20 khz. A logic level below 0 3v at dim forces pt4115 to turn off the led and the logic level at dim must be at least 2 5v to turn on the full led current.
