MCP1632-BAESLASHMS datasheet(18/34 Pages) MICROCHIP

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MCP1632

DS20005254A-page 18

 2013 Microchip Technology Inc.

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. The LED

string can be dimmed by driving the EN pin (PWM

dimming) or by adjusting the value of the RVREF

resistor (current dimming). The maximum allowable

peak current into Q1 MOSFET can be calculated using

Equation 5-1. The SEPIC converter exhibits poor

dynamic performance and is recommended only for

applications with low step response demands, like LED

drivers or battery chargers.

FIGURE 5-2:

MCP1632 SEPIC Converter.

MCP1632

RVREF

CSS

VIN

VREF

COMP

VEXT

GND

VIN

LDO

RSENSE

RSLOPE

L1A

CIN

COUT

L1B

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