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MSS7341 データシート(PDF) 12 Page - Microchip Technology

部品番号 MSS7341
部品情報  High Voltage Input Integrated Switch Step-Down Regulator
PDF  38 Pages
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メーカー  MICROCHIP [Microchip Technology]
ホームページ  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MSS7341 データシート(HTML) 12 Page - Microchip Technology

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MCP16301
DS25004A-page 12
© 2011 Microchip Technology Inc.
FIGURE 4-1:
MCP16301 Block Diagram.
4.2
Functional Description
4.2.1
STEP-DOWN OR BUCK
CONVERTER
The MCP16301 is a non-synchronous, step-down or
buck converter capable of stepping input voltages
ranging from 4V to 30V down to 2.0V to 15V for
VIN > VOUT.
The integrated high-side switch is used to chop or
modulate the input voltage using a controlled duty cycle
for output voltage regulation. High efficiency is
achieved by using a low resistance switch, low forward
drop diode, low equivalent series resistance (ESR),
inductor and capacitor. When the switch is turned on, a
DC voltage is applied to the inductor (VIN - VOUT),
resulting in a positive linear ramp of inductor current.
When the switch turns off, the applied inductor voltage
is equal to -VOUT, resulting in a negative linear ramp of
inductor current (ignoring the forward drop of the
Schottky diode).
For
steady-state,
continuous
inductor
current
operation, the positive inductor current ramp must
equal the negative current ramp in magnitude. While
operating in steady state, the switch duty cycle must be
equal to the relationship of VOUT/VIN for constant
output voltage regulation, under the condition that the
inductor current is continuous, or never reaches zero.
For discontinuous inductor current operation, the
steady-state duty cycle will be less than VOUT/VIN to
maintain voltage regulation. The average of the
chopped input voltage or SW node voltage is equal to
the output voltage, while the average of the inductor
current is equal to the output current.
FIGURE 4-2:
Step-Down Converter.
Schottky
Diode
COUT
CBOOST
Slope
Comp
PWM
Latch
+
-
Overtemp
Precharge
R
Comp
Amp
+
-
CCOMP
RCOMP
HS
Drive
CS
VREG
BG
REF
SS
VREF
OTEMP
Boost
Pre
Charge
500 kHz OSC
S
VOUT
VOUT
RSENSE
GND
Boost Diode
VIN
EN
RTOP
RBOT
BOOST
SW
GND
FB
VREF
SHDN all blocks
+
-
CIN
+
+
Schottky
Diode
COUT
VOUT
SW
VIN
+
-
SW
on
off
on
on
off
IL
IL
L
IOUT
VOUT
VIN
0
SW
on
off
on
on
off
IL
IOUT
VIN
0
Continuous Inductor Current Mode
Discontinuous Inductor Current Mode



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