Microchip Technology MCP19117, User Manual

Page: 11 / 42

MCP19117 FLYBACK
STAND-ALONE EVALUATION
BOARD USER’S GUIDE

2016 Microchip Technology Inc. DS50002472A-page 11
Chapter 1. Product Overview
1.1 INTRODUCTION
This chapter provides an overview of the MCP19117 Flyback Stand-Alone Evaluation
Board and covers the following topics:
•
MCP19117 Short Overview
• What is the MCP19117 Flyback Stand-Alone Evaluation Board?
• MCP19117 Flyback Stand-Alone Evaluation Board Kit Contents
1.2 MCP19117 SHORT OVERVIEW
The MCP19117 is a highly integrated, mixed-signal, analog pulse width-modulation
(PWM) current mode controller with an integrated microcontroller core, and offers syn-
chronous or asynchronous operation. Since the MCP19117 device uses traditional
analog control circuitry to regulate the output current or voltage, the integration of the
PIC
®
microcontroller mid-range core is used to provide complete customization of the
device’s operating parameters, protection levels, programmable offset, dead-times,
slope compensation and fault handling procedures.
The MCP19117 has two internal low drop-out regulators (LDOs). A 5V LDO (V
DD
) pro-
vides internal power to all the digital circuitry and can supply limited external power at
the V
DD
pin. A 4V LDO (AV
DD
) provides power to the internal analog circuitry and sup-
plies the reference voltage to the ADC. This device features synchronous low-side inte-
grated drivers and 8k Words non-volatile memory, all in a space-saving 28-pin 5x5 mm
QFN package.
To support traditional MOSFETs, pin 20 (V
DR
) is used to provide input power to the two
low-side synchronous gate drivers. The evaluation board is populated with the
Microchip TC1240AECHTR voltage doubler. Resistor population provides the option of
powering V
DR
with 10V through the TC1240AECHTR voltage doubler (R19, R21
populated; R22 not populated) or 5V (R22 populated; R19, R21 not populated)
gate-drive capability.
User firmware, including device configuration, is loaded using Microchip’s MPLAB
®
X
Integrated Development Environment (IDE). A graphical user’s interface (GUI) is used
to communicate with and edit operating parameters of the MCP19117. The GUI com-
municates via I
2
C using the PICkit™ Serial Analyzer.
The GUI offers the user the ability to adjust the programmable features available in the
MCP19117. Note that the interface cannot stop the user from uploading incorrect set-
tings to the device. Incorrect settings may have unintended consequences, including,
but not limited to, unstable operation, damaging the load, and even damaging of the
MCP19117 device. It is the user's responsibility to understand the system effects of the
parameters they enter.