MCP1633 datasheet(19/31 Pages) MICROCHIP

19 / 31 page

 2020 Microchip Technology Inc.

DS20006289A-page 19

MCP1633

5.0

APPLICATION CIRCUITS

5.1

Typical Applications

The MCP1633 PWM controller can be used for

applications that require low-side MOSFET control,

such as Boost, Buck-Boost, Flyback, SEPIC or CUK

converters. By using an external high-side MOSFET

driver (e.g. MCP14628), the MCP1633 device is able to

control the buck converter. The MCP1633 PWM

controller

can

easily

interfaced

with

microcontroller in order to develop intelligent solutions

for LED driving.

Figure 5-1 depicts the typical boost converter con-

trolled by MCP1633. If the converter must operate with

input voltages higher than 5.5V, a linear voltage

regulator can be used to bias the MCP1633 controller.

The Peak Current Mode control used in this case will

ensure consistent performance over a wide range of

operating conditions. The MOSFET is protected

against overcurrent by internally limiting the maximum

voltage at the output of the error amplifier of the

controller. If the voltage applied on the CS pin exceeds

the set threshold, the MCP1633 device will reduce the

duty cycle in order to prevent overcurrent in MOSFET.

Note:

The boost converter is not protected

against the output short circuit.

FIGURE 5-1:

MCP1633 Boost Converter.

The single-ended primary inductor converter (SEPIC)

used to drive an LED string is presented in Figure 5-2.

This converter offers buck-boost functionality and is

protected against the output short circuit. The inductors

can share the same magnetic core (coupled inductors);

in this case, the mutual inductance doubles the value of

the inductor, reducing the ripple of the current.

MCP1633

VIN

VOUT

SS/VREF

COMP

EN/SYNC

VEXT

PG ND

VCC

CSS

Rfsw

Fsw

DIMM

CSO

Ripo

IOUT

OVP

SDRV

ISP

ISN

FAULT

To microcontroller

LDO

MCP1633 Datasheet(PDF) 19 Page - Microchip Technology

MCP1633 Datasheet(HTML) 19 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31

Datasheet Download

Link URL