Constant Current Laser Diode Driver Using OPA2350 OP-AMP

The voltage-controlled current source circuit can be used to drive a constant current into a signal or pump laser diode. This simple linear driver provides a cleaner drive current into a laser diode than switching PWM drivers. The basic circuit is that of a Howland current pump with a current booster (Q1) on the output of a R-R CMOS OPA2350 op amp (U1). Laser diode current is sensed by differentially measuring the voltage drop across a shunt resistor (RSHUNT) in series with the laser diode. The output current is controlled by the input voltage (VIN) that comes from Trim pot PR1.

Features,

  • Supply 3,3V DC
  • Load Up to 300mA
  • PR1 Trimpot Current Adjust

 

 

Download Data Sheet OPA2350

 

 

 

LED Based Strobe Controller with Frequency Control and Display Using PIC16F1825 and CAT4016 IC

Strobe provides regular flashes of light. Usually Strobes are designed using Xenon Tubes, Here is LED based simple solution can be used as strobe for entertainment and events and also as warning signals, Project is based on PIC16F1825 micro-controller with two digit frequency display.CAT4016 IC provided to drive 2 display.

Project provides TTL output signal, frequency 1Hz-25Hz, Tact switches provided to set the frequency.  Use solid state relay , BJT transistor or Mosfet at output to drive LED, choose right load driver as per LED required current.

 

The CAT4016 is a 16 channel constant current driver for LED billboard and other general display applications. LED channel currents are programmed together via an external RSET resistor. Low output voltage operation on the LED channels as low as 0.4 V (for 2 to 100 mA LED current) allows for more power efficient designs.

A high-speed 4-wire serial interface of up to 25 MHz clock frequency controls each individual channel using a shift register and latch configuration. A serial output data pin (SOUT) allows multiple devices to be cascaded and programmed via one serial interface. The device also includes a blanking control pin (BLANK) that can be used to disable all channels independently of the interface.

Thermal shutdown protection is incorporated in the device to disable the LED outputs if the die temperature exceeds a set limit.

Features

  • Supply 4.5 to 5V DC
  • Frequency 1Hz To 25Hz
  • Easy Interface with Relay Board
  • Easy Interface with Solid State Relay
  • On Board Power LED
  • On Board Output LED
  • Onboard Switch to set the frequency
  • 2X7 Segment 0.5 Inch Display

Note: Refer Our DC Solid State Relay Circuit  which can be used to drive LED or any other Load.

Applications

  • Strobe for Entertainment
  • Traffic Signal
  • Warning Signal
  • Ambulance Warning Signals

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Digital LED Dimmer With 2 Digit Display Using PIC Micro-Controller

Digital LED dimmer with 2 digit display, simple circuit using PIC16F1825  Micro-Controller and CAT4016 LED diver from www.onsemi.com .  LED intensity can set using two tact switches. The board provides TTL PWM 1-99% duty cycle out which required Mosfet/BJT transistor or LED driver on output for LED load. Frequency 250Hz.

  • Supply 4.5 to 5V DC
  • Range 01 to 99 Duty Cycle
  • On Board Two Switches for PWM
  • On Board Power LED

 

 

 

 

 

 

 

 

 

 

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