MCP1630V is PWM controller with voltage / current check, it requires a microcontroller to get the frequency reference

an if required you can even control the dimming via software. This board i built is a current control boost device i use

to drive high power LEDs. The logic runs at 5V and usually gets the regulated voltage through the micorcontroller regulator

like 7805 and so on.

**Vcc input 7.5 to 18V**

**Max out current 1A**

**Max out voltage 50V **

**Max out power 30W**

Current output is regulated between the relationship of dropped voltage of R1 & R2 intersection and the voltage drop of the shunt resistor/s

R6 & R7. That means if we whant to drive a **200mA LED** and we have **0.5 volt** as a shunt resistor with 200mA is V=R*I = 0.2*0.5=**0.1V**

Therefore the voltage across the intersection of R1 & R2 must be the same voltage, if we consider that we have 5V from the MCU in the

DIMM input we will use something like R1=200ohm & R2=10K because Vout=R1/(R1+R2)*Vin = 200/(10200)*5 = 0.098V.

The accademic formula is normally Vout=R1/(R1+R2)*Vin but in this case mi design has resistors with upside down names.