PIC18F23K22 datasheet(18/20 Pages) MICROCHIP

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LED Lighting Solutions Design Guide

www.microchip.com/lighting

LED Lighting Solutions

Using TC6501 Open Drain Output for

Current Set-Point Control

There are different ways that the TC6501 and TC6502

temperature sensors can be used in an application. The

open-drain output of the TC6501 is useful for controlling

signals in analog circuits. For example, the TC6501 could

be used to limit a current reference set-point for a switch-

mode power supply. It could also be connected to signals in

op amp circuits to alter the behavior of the system when a

temperature limit is exceeded (see figure below).

Using the TC6501 to Provide MCU Interrupt

If a microcontroller is present and managing the application,

a TC6502 with CMOS active-high output signal can be used

to provide an interrupt. The microcontroller in turn will be

able to apply PWM dimming techniques to reduce the power

output to the module (as shown in figure below).

LED

Dimming

Signal

+5V

PIC12F683

VCC

GP0

GND

VCC

PWM

TC6502

GND

HIST

TOVER

+12V

Fan

+5V

GND

HIST

VCC

TOVER

TC6502

Using TC6501 Open Drain Output for Current Set-Point Control

Using the TC6501 to Provide MCU Interrupt

Fan Controller Application Using TC6502

If a cooling device (fan) is available, a TC6502 device (with

the HYST pin connected to VCC to obtain a 10°C hysteresis

threshold) can directly control a cooling fan to improve the

heat transfer.

+5V

MCP1630

VIN

VCC

VREF

GND

VIN

VEXT

COMP

OSC IN

TC6501

GND

HIST

TOVER

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