ACS4500BU 4.5A (Buck) Laser Driver

$29

This unit has a slightly smaller profile for easier fit in the hollow back of a 12mm module housing when being used for under 2.5A settings connected directly to the diode pins if that is the goal. Higher currents require heatsinking and then not much difference between this and the 5500 model except this can only do 4.5A and the 5500 can do 5.5A.

ACS4500BU - the next generation of compact buck drivers that came to replace the BlackBuck 3 and BlackBuck 6 ones. Designed to power laser diodes or LEDs from batteries or other power sources.

Major improvements and differences from BlackBuck 3/6 drivers:

Extended range of output current adjustment
High-side design
Improved soft-start
Ceramic fuse for reverse polarity protection
Larger potentiometer
Thermal areas on the back side for better heat dissipation

Specifications:

Supply voltage ........................ 6...14V
Output current (+/- 5%) .................... 0...4800mA
Load forward voltage.............. 1.5...6V **
Power ON rising time ................ 250ms
Board overheat protection .... 140ºC
Max dimensions ..................... 30x22x3.5mm
Main dimensions .................... 10x16x3.5mm

* - The supply voltage must exceed the forward voltage of the load by not less than 1V.

Typical connection example

Picture of ACS5500BU but specs are the same for the ACS4500BU except it only goes to 4.8A and had a lower profile for better fit in the back of a 12mm module when used for under 2.5A applications.

Lock input - this input is used to control the driver. You can turn off the driver by applying a logic0 level to the input or turn it on by applying a logic1 level. This input is tolerant to 3.3/5V signals and internally pulled up to logic1 level. Leave it to float if you do not use external control. This input does not support fast PWM.

Recommendations for soldering and heatsinking:

The customer must have soldering skills because the pads have a small size and careless soldering can damage the driver. Use only neutral soldering flux and low-temperature solder in order to avoid overheating of the PCB. Observe the rules of antistatic protection, the driver is ESD sensitive.

The following picture shows how to install the driver on the heat sink

1. Solder the wires

2. Attach small strips of insulating tape to the pads

3. Spread some thermal adhesive on the back of the driver

4. Press the driver to the heat sink

250ms soft-start capture

Dimensions (main and satellite board)

What's included in the package:

Tested and 1000mA preconfigured driver board (The drivers are delivered fully tested and preconfigured for 1000mA output. We can configure them according to your requirements, just specify the value in the order comment)