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MCP1632-BAE/MS 데이터시트(PDF) 18 Page - Microchip Technology

부품명 MCP1632-BAE/MS
상세설명  High-Speed, Low-Side PWM Controller
PDF  34 Pages
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제조업체  MICROCHIP [Microchip Technology]
홈페이지  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MCP1632-BAE/MS 데이터시트(HTML) 18 Page - Microchip Technology

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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
EN
FB
CS
VEXT
GND
VIN
LDO
Q1
RSENSE
RSLOPE
L1A
D1
+
-
CIN
COUT
L1B
RS
R1
CC
C1
C2
C3
R2
R3



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