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MCP16331 数据表(PDF) 17 Page - Microchip Technology

部件名 MCP16331
功能描述  High-Voltage Input Integrated Switch Step-Down Regulator
PDF  40 Pages
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制造商  MICROCHIP [Microchip Technology]
网页  http://www.microchip.com
标志 MICROCHIP - Microchip Technology

MCP16331 数据表(HTML) 17 Page - Microchip Technology

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 2014 Microchip Technology Inc.
DS20005308B-page 17
MCP16331
To calculate the shunt resistance, the maximum IBOOST
and IZ current are used at the minimum input voltage
(Equation 4-2).
EQUATION 4-2:
SHUNT RESISTANCE
VZ and IZ can be found on the Zener diode
manufacturer’s data sheet. Typically, IZ = 1 mA.
FIGURE 4-4:
Series Regulator Boost Supply.
Series regulator applications use a Zener diode to drop
the excess voltage. The series regulator bias source
can be input or output voltage derived, as shown in
Figure 4-4. The boost supply must remain between
3.0V and 5.5V at all times for proper circuit operation.
R
SH
V
INMIN
V
Z
–
I
Boost
I
Z
+
------------------------------
=
CB
VOUT
VIN
CIN
COUT
SW
BOOST
GND
EN
FB
L
RTOP
RBOT
VIN
Boost Diode
FW Diode
12V
15V to 50V
CB
VIN
CIN
SW
BOOST
GND
EN
FB
L
VIN
Boost Diode
FW Diode
2V
12V
VZ = 7.5V
VZ = 7.5V
VOUT
RTOP
RBOT
COUT
MCP16331
MCP16331



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