8-bit Power Supply Sell Sheet

8-bit PIC® Microcontrollers for Power Supplies
Closed-Loop Control Made Easy Using
Core Independent Peripherals and Intelligent Analog
Summary
Increased regulation in the home electronics, portable
electronics and lighting markets has created several new
constraints for the designers of devices for these applications.
Lower energy consumption and waste reduction have joined
cost effectiveness as primary design objectives for many new
systems. Balancing these requirements can be accomplished
by using techniques such as Peak Current Mode Control
(PCMC) to cost effectively optimize performance and efficiency.
In order to achieve these system goals, even the smallest
power sources must be flexible, intelligent and able to adapt to
changing requirements. Modern power supplies often require
controllers designed to support the demands of closedloop control and system management, while being able to
communicate with other elements of the system.
Levels of Power Supply Control
Within the power supply market, there are several different
levels of integration and intelligence. With each increase
in capability comes a corresponding increase in precision
and system efficiency. The most commonly used levels are
described below:
Level 1: Involves basic control and monitoring functions.
The controller provides limited intelligence, with features
like start-up sequencing, automatic shutdown and watchdog
fault detection. More sophisticated solutions can provide
logging functions for failure analysis, remote communication
and customized thermal control algorithms.
Level 2: Features increased integration with the power
supply and allows for better PSU environment monitoring.
The controller can adjust output voltage, voltage limits,
current limits and thermal limits. PWMs are used to
provide direct control of the power unit, which allows the
integration of “soft-start” capability. Serial communication
is used to communicate with a host device, control cooling
fans and monitor temperature sensors.
Level 3: Allows for topology control by permitting the design
to be reconfigured, including changing the analog loop
configuration and control loop filters on the fly. Power supply
regulation is directly controlled by digital circuitry. Such
control allows for complex digital compensation algorithms
and non-linear control techniques to be employed.
8-bit PIC MCUs for Power Supplies
Microchip offers a broad range of 8-bit PIC microcontrollers
designed to support the increasingly rigorous demands
of the modern small power supply. The high integration of
peripherals and functions allows for closed-loop control, Peak
Current Mode Control (PCMC), HW compensators, Slope
Compensation (SC) and ramp generation. By enabling lowcost digital control to implement power conversion functions,
PIC MCUs empower you to realize many benefits for your end
application. Products within our 8-bit portfolio can support
up to “Level 3” topologies by pairing extremely efficient CPU
performance with a unique set of Intelligent Analog and Core
Independent digital peripherals.
The benefits are many, including the ability to implement
intelligent system functions like soft-start and voltage
slew rate control, digital temperature compensation and
remote monitoring and control. In addition, the integrated
peripherals support a reduction in component count, PCB
size and product cost.
Integrated Peripherals
Intelligent Analog and Control
■ Zero Cross Detect (ZCD)
• AC high-voltage zero crossing detection for simplifying
TRIAC control, synchronized switching control and timing
■ Programmable Ramp Generator (PRG)
• Analog ramp generator (with slope compensation)
for current/voltage-mode power supplies
■ Slope Compensation (SC)
• Performs slope compensation function for peak
current mode power supplies
■ Configurable Logic Cell (CLC)
• Integrated combinational and sequential logic
• Custom interconnection and re-routing of
digital peripherals
■ Operational Amplifier (OPA)
• General purpose op amp for internal and external
signal source conditioning
■ High Speed Comparator (HSComp)
• General purpose rail-to-rail comparator with < 50 ns
response time
■ Digital to Analog Converter (DAC )
• Programmable voltage reference with multiple
internal and external connections
■ Analog to Digital Converter (ADC)
• General-purpose 8-/10-/12-bit ADC with stable
voltage reference
Integrated Peripherals (Continued)
■■ Complementary Output Generator (COG)
• Automated complementary output with
programmable rising/falling edge events, auto
shutdown, polarity, phase, precision deadband and
blanking control
■■ Complementary Waveform Generator (CWG)
• Automated complementary output with auto
shutdown and deadband control
■■ Numerically Controlled Oscillator (NCO)
• Precision linear frequency generator (PWM @ 50%
duty cycle) with 0.0001% step size of source input
clock frequency
• General-purpose 20-bit timer/counter
Signal Generation
■■ Programmable Switch Mode Controller (PSMC)
• 16-bit PWMs with dedicated 64 MHz clock
• Automated complementary output with programmable
rising/falling edge events, auto shutdown, polarity,
phase, deadband and blanking control
• General-purpose 16-bit timer/counter
■■ 16-bit PWM
• 16-bit PWM with edge and center aligned modes
• General-purpose 16-bit timer/counter
■■ Pulse Width Modulation (PWM)
• General-purpose 10-bit PWM
■■ (Enhanced) Capture Compare PWM (CCP/ECCP)
• 10-bit PWM control with 16-bit capture, compare and
auto shutdown
–
–
1
–
1
0/1
1
–
–
–
–
1
–
3
–
–
0/1
–
–
–
–
1
PIC12F1840
7K
256
256
6
0/4/0
–
–
1
0/1
–
–
–
–
–
–
–
1
1
PIC12F752
1.75K
64
HEF*
6
0/4/0
–
1/0/0/0
2
1/0
–
–
–
1/0
–
–
–
–
–
PIC16F753
3.5K
128
HEF*
12
0/8/0
2
0/1/0/0
2
1/0
–
–
–
1/0
–
0/1
–
–
–
PIC16F1765
14K
1K
HEF*
12
0/8/0
1
1/0/0/1
2
1/0
2
–
–
1/0
3
1/0
1
1
1
PIC16F1825
14K
1K
256
12
0/8/0
–
–
2
2/2
–
–
–
–
–
–
–
1
1
PIC16F1709
14K
1K
HEF*
18
0/12/0
2
0/1/0/0
2
2/0
2
–
–
1/0
3
–
1
1
1
PIC16F1769
14K
1K
HEF*
18
0/12/0
2
2/0/0/2
4
2/0
4
–
–
2/0
3
2/0
1
1
1
PIC18F14K22
16K
512
256
18
0/12/0
–
–
2
0/1
–
–
–
–
–
–
–
1
1
PIC16F1789
28K
2K
256
36
0/0/14
3
3/1/0/0
4
3/0
–
4
–
–
–
–
–
1
1
EEPROM
EUSART
–
1/0/0/0
i2C/SPI
CLC
–
–
ZCD
COG/CWG
3/0/0
0/4/0
PRG/SC
NCO
4
6
PWM
–
HEF*
Op Amp
64
256
A/D (Ch)
8/10/12b
896
3.5K
I/O Pins
PIC10F322
PIC12F1572
Device
SRAM(B)
PSMC
CCP/ECCP
Comparator
DAC
5/8/9/10b
Program
Memory (B)
Select 8-bit PIC MCUs for Power Supplies
*HEF = 128B of High-Endurance Flash
Development Tools
■■ PICkit™ 3 In-Circuit Debugger (PG164130)
■■ MPLAB® ICD 3 In-Circuit Debugger (DV164035)
■■ PSMC Evaluation Platform (DM164130-1)
■■ ■■ ■■ ■■ PICDEM™ Lab Development Kit (DM13045)
MPLAB PM3 Universal Device Programmer (DV007004)
MPLAB Starter Kit for PIC18F MCU (DM180021)
PICDEM PIC18 Explorer Board (DM183032)
www.microchip.com/8bit
Visit our web site for additional product information and to locate your local sales office.
Microchip Technology Inc. • 2355 W. Chandler Blvd. • Chandler, AZ 85224-6199
The Microchip name and logo, the Microchip logo, MPLAB and PIC are registered trademarks and PICDEM and PICkit are trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. All
other trademarks mentioned herein are property of their respective companies. © 2015, Microchip Technology Incorporated. All Rights Reserved. Printed in the U.S.A. 8/15
DS30010027C
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