36V/1.2A buck high dimming ratio LED constant current driver PT4115B(Order model：PT4115BE89E/PT4115BEESH)
Product Overview of PT4115BE89E/PT4115BEESH
PT4115BE89E/PT4115BEESH is a step-down constant current source with continuous inductor current conduction mode, used to drive one or more series connected LEDs.
PT4115BE89E/PT4115BEESH has an input voltage range from 6V to 36V (with a maximum withstand voltage of 40V) and an adjustable output current of up to 1.2A. According to different input voltages and external devices, PT4115BE89E/PT4115BEESH can drive LEDs up to tens of watts.
PT4115BE89E/PT4115BEESH has a built-in power switch and uses high-end current sampling to set the average LED current. It can accept analog dimming and a wide range of PWM dimming through the DIM pin. When the voltage of the DIM is low, the power switch is turned off, and PT4115BE89E/PT4115BEESH enters a standby state with extremely low working current.
Main features of PT4115BE89E/PT4115BEESH
⚫Very few external components
⚫Wide input voltage range: from 6V to 36V
⚫Up to 97% efficiency
⚫The maximum output current of the PT4115BE89E/PT4115BEESH chip is 1.2A
⚫Reuse DIM pins for LED switching, analog dimming, and PWM dimming
⚫Up to 1MHz switching frequency
⚫PT4115BE89E/PT4115BEESH step-down constant current drive chip with 3% output current accuracy
⚫PT4115BE89E/PT4115BEESH driver chip with built-in LED open circuit natural protection
⚫PT4115BE89E/PT4115BEESH constant current drive IC with built-in RCS open circuit protection
⚫PT4115BE89E/PT4115BEESH constant current drive chip adopts high-end current sampling detection
⚫PT4115BE89E/PT4115BEESH chip hysteresis control: no compensation required
⚫PT4115BE89E/PT4115BEESH Output Adjustable Constant Current Control Method
⚫PT4115BE89E/PT4115BEESH has temperature protection function
Typical applications of PT4115BE89E/PT4115BEESH
⚫Low voltage LED spotlights replace halogen lights
⚫Car LED lights
⚫LED backup light
⚫LED signal light
Pin arrangement of PT4115BE89E/PT4115BEESH
Pin function of PT4115BE89E/PT4115BEESH
Pin number
| Pin name
| Function Description
|
SOT89-5
| ESOP8
|
| 1 | 3
| SW
| Switch output SW is the drain terminal of the internal N-MOS |
| 2 | 6，7
| GND
| Ground the signal and power supply directly to the ground plane |
| 3 | 8
| DIM
| Logic level dimming input DIM is low, turn off the current and adjust the machine DIM is high, turn on the current regulator |
| 4 | 1 | CSN
| Current sampling terminal, sampling resistor connected between CSN and VIN terminals
|
| 5 | 2 | VIN
| The power input terminal must be connected to a nearby bypass capacitor |
| - | 4，5
| NC
| NC
|
| - |
| Exposed PAD
| Heat dissipation end, attached to the PCB board to reduce thermal resistance, this pad is connected to the GND on the PCB, and floating is prohibited |
Typical application circuit diagram of PT4115BE89E/PT4115BEESH
