Datasheet

10 LED Lighting Solutions Design Guide www.microchip.com/lighting
LED Lighting Solutions
PIC16HV785
Digital IO
OA1
COMP1
OA2
COMP2
V BUS
LED
String
Temp
Sensor
PWM
Voltage
Ref.
5V Reg.Int OSC
BOR
CPU
–
+
–
+
–
+
–
+
10-bit ADC
PIC16HV785 Boost LED Driver Application
Mixed-Signal LED Drivers
Some devices, such as the PIC16F616, have a SR latch
module that can be used in many different ways along with
the comparators and other digital signal events. Events such
as clock pulses or comparator signals can be programmed to
set or reset the SR latch. These programming options allow
almost any kind of control signal to be generated.
The PIC16F785 has two on-chip op amps, two on-chip
comparators, two SR latch PWM modules and an adjustable
voltage reference. This combination of peripherals can be
digitally configured to implement a wide variety of SMPS
circuit topologies.
Literature on the Web
■
AN1035 – Designing with HV Microcontrollers DS01035
■
AN1047 – Buck-Boost LED Driver Using the PIC16F785
MCU, DS01047
■
AN1271 – Offline Power Converter for High Brightness
LEDs Using the PIC16HV785 Microcontroller, DS01271
■
PIC16F785/HV785 Device Data Sheet, DS41249
PIC16HV785
COMP1
COMP2
OA1
LED
String
OA2
I SENSE
PWM Dimming Control
AC Ref
R
FB
–
+
–
+
–
+
PWM
Voltage
Ref.
5V Reg.Int OSC
BOR
CPU
–
+
10-bit ADC
MCP1402
PWM
Input
Filter
V BUS
V BUS
V BUS
PIC16HV785 Flyback Converter with PFC and Dimming Control