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| 型号： | ADM00352 |
| 厂商： | Microchip Technology |
| 文件页数： | 12/38页 |
| 文件大小： | 0K |
| 描述： | BOARD DEMO FOR MCP16301 |
| 设计资源： | ADM00352 Bill of Materials ADM00352 Schematic |
| 特色产品： | MCP16301 Demo Boards |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 3.3V |
| 电流 - 输出： | 600mA |
| 输入电压： | 4 ~ 30 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 500kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | MCP16301 |
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MCP16301
V IN
C IN
BG
REF
V REG
Boost
Pre
Charge
BOOST
Boost Diode
V OUT
SS
V REF
OTEMP
500 kHz OSC
C BOOST
V OUT
R TOP
R BOT
FB
+
Amp
-
R COMP
-
Comp
+
Precharge
Overtemp
S
PWM
Latch
R
HS
Drive
+
CS
SW
Schottky
Diode
C OUT
V REF
C COMP
+
R SENSE
EN
+
-
SHDN all blocks
GND
Slope
Comp
GND
FIGURE 4-1:
MCP16301 Block Diagram.
4.2
4.2.1
Functional Description
STEP-DOWN OR BUCK
CONVERTER
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.
The MCP16301 is a non-synchronous, step-down or
I L
buck converter capable of stepping input voltages
ranging from 4V to 30V down to 2.0V to 15V for
V IN > V OUT .
The integrated high-side switch is used to chop or
V IN
+
-
SW
Schottky
Diode
L
V OUT
C OUT
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 (V IN - V OUT ),
resulting in a positive linear ramp of inductor current.
When the switch turns off, the applied inductor voltage
I L
0
SW
I OUT
V IN
V OUT
is equal to -V OUT , resulting in a negative linear ramp of
on
off
on
off
on
inductor current (ignoring the forward drop of the
Schottky diode).
For steady-state, continuous inductor current
Continuous Inductor Current Mode
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 V OUT /V IN for constant
output voltage regulation, under the condition that the
I L
0
SW
I OUT
V IN
inductor current is continuous, or never reaches zero.
on
off
on
off
on
For discontinuous inductor current operation, the
Discontinuous Inductor Current Mode
steady-state duty cycle will be less than V OUT /V IN to
maintain voltage regulation. The average of the
DS25004A-page 12
FIGURE 4-2:
Step-Down Converter.
? 2011 Microchip Technology Inc.
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