1-10 LED constant current max. 1A and dimmer module PT4115

The PT4115 is a continuous inductor current conduction mode buck constant current source for driving one or more series LEDs . The PT4115 has an input voltage range of 6 volts to 36 volts and an adjustable output current of up to 1.2 amps. Depending on the input voltage and external components, the PT4115 can drive up to tens of watts of LEDs .  The PT4115 has a  built-in power switch that uses high-side current sampling to set the average LED current and accepts analog dimming and a wide range of PWM dimming through the DIM pin . When the voltage of the DIM is lower than 0.3 volts, the power switch is turned off, and the PT4115 enters a standby state with extremely low operating current.

Input voltage: 6-30V

Output current: continuously adjustable, up to 1.0A

Product size: 20*20*10 ( mm )

low-voltage LED spotlights instead of halogen lights, car LED lights, LED backup lights

DATASHEET 

PT4115 is a inductor buck converter of continuous conduction mode, used to drive one or multiple series connected LED design, one voltage is more efficient than whole LED voltage chain. The device is between the 6V and 30V to input power, and provided with an external adjustable output current up to 1.2A.In the power supply voltage and the external components of the different, PT4115 offers more than 30 watts of output power.
The PT4115 includes power switch and a high output current detection circuit, and used for an external resistor to set the nominal average output current, and a dedicated DIM input, no matter what DC voltage or pulse light modulation range. Applying a series of voltage of 0.3V or lower DIM turns off the output pins, and switch a low current standby equipment. The PT4115 is available in SOT89 5 package

Notes

• The required LED drive current can be tweaked by changing the value of resistor R1 (in the prototype, two 0.20-R resistors are connected in series to get 0.3-R value). Formula: ILED = 100/R1
• As stated earlier, the PT4115 allows dimming with a PWM signal at the DIM (pin 3) input. A logic level below 0.3 V at DIM forces PT4115 to turn off the LED, and the logic level at DIM must be at least 2.5 V to turn on the full LED current. The frequency of PWM dimming ranges from 100 Hz to more than 20 kHz.
• The DIM pin can be driven by an external dc voltage (VDIM) to adjust the output current to a value below the nominal average value defined by R1. The dc voltage is valid from 0.5 to 2.5 V (when the dc voltage is higher than 2.5 V, the output current keeps constant). The LED current also can be adjusted by a resistor connected to the DIM pin. The average output current is given by: IOUT = 0.1 x VDIM/2.5 x R1
• https://www.electroschematics.com/13142/unique-bedroom-lamp-led-driver/

Read 
At present, PT4115 practical lighting module can provide three driver modules of 1 piece of 1W (green), 3 piece of 1W (blue) and 1 piece of 3W (red). The sample module can do switch test with halogen bulb for 100000 times, in the same brightness of halogen lamp, power consumption can be reduced by half.

1 Simple low parts count
2 Wide input voltage range: 6V to 30V
3 Up to 1.2A output current
4 Single needle opening / closing switch and the use of DC voltage or PWM brightness to control
5 Up to 1MHz switch frequency
6 Typical 5% output current accuracy
7 The inner open LED protection
8 High efficiency (up to 97%).
9 High side current detection
10 The hysteresis control: no compensation
11 Adjustable constant current of LED

1 Low voltage halogen replace light-emitting diode
2 Automotive lighting
3 Low voltage industry lighting 
4 Days preparing lighting
5 The luminous sign
6 The lighting is suitable for SELV
7 The backlight of LCD TV 



ขา DIM แรงดันไฟ ต่ำกว่า 0.3 V วงจรจะหยุดทำงาน
ขา DIM แรงดันไฟ 0.5-2.5V  ใช้การปรับกระแส

ขา DIM แรงดันไฟ ต่ำกว่า 0.3 V  วงจรจะหยุดทำงาน

ขา DIM แรงดันไฟ 0.5-2.5V   ใช้การปรับกระแส( หรี่ไฟ) Dimmer

ขา DIM แรงดันไฟมากกว่า 2.5V  จ่ายกระแสคงที่สูงสุด = 100mV/Rs