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参数资料
| 型号： | ADM00360 |
| 厂商： | Microchip Technology |
| 文件页数： | 17/38页 |
| 文件大小： | 0K |
| 描述： | BOARD DEMO FOR MCP16301 D2PAK |
| 设计资源： | ADM00360 Bill of Materials ADM00360 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： | 300mA |
| 输入电压： | 4 ~ 26 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
5.0
APPLICATION INFORMATION
5.3
General Design Equations
5.1
Typical Applications
The step down converter duty cycle can be estimated
using Equation 5-2 , while operating in Continuous
The MCP16301 step-down converter operates over a
wide input voltage range, up to 30V maximum. Typical
applications include generating a bias or V DD voltage
for the PIC ? microcontrollers product line, digital con-
trol system bias supply for AC-DC converters, 24V
industrial input and similar applications.
Inductor Current Mode. This equation also counts the
forward drop of the freewheeling diode and internal
N-Channel MOSFET switch voltage drop. As the load
current increases, the switch voltage drop and diode
voltage drop increase, requiring a larger PWM duty
cycle to maintain the output voltage regulation. Switch
voltage drop is estimated by multiplying the switch
5.2
Adjustable Output Voltage
current times the switch resistance or R DSON .
Calculations
EQUATION 5-2:
CONTINUOUS INDUCTOR
( V IN – ( I SW × R DSON ) )
To calculate the resistor divider values for the
MCP16301, Equation 5-1 can be used. R TOP is con-
nected to V OUT , R BOT is connected to GND and both
are connected to the V FB input pin.
EQUATION 5-1:
CURRENT DUTY CYCLE
( V OUT + V Diode )
D = -------------------------------------------------------
The MCP16301 device features an integrated slope
= R BOT × ? ------------- – 1 ?
? V FB
R TOP
EXAMPLE 5-1:
V OUT
?
compensation to prevent the bimodal operation of the
PWM duty cycle. Internally, half of the inductor current
down slope is summed with the internal current sense
signal. For the proper amount of slope compensation,
it is recommended to keep the inductor down-slope
current constant by varying the inductance with V OUT ,
V OUT
V FB
R BOT
R TOP
V OUT
=
=
=
=
=
3.3V
0.8V
10 k Ω
31.25 k Ω (Standard Value = 31.2 k Ω )
3.3V
where K = 0.22V/μH.
EQUATION 5-3:
K = V OUT ? L
EXAMPLE 5-2:
For V OUT = 3.3V,
recommended.
an
inductance
of
15 μH
is
V OUT
V FB
=
=
5.0V
0.8V
TABLE 5-1:
RECOMMENDED INDUCTOR
VALUES
R BOT
R TOP
V OUT
=
=
=
10 k Ω
52.5 k Ω (Standard Value = 52.3 k Ω )
4.98V
V OUT
2.0V
3.3V
K
0.20
0.22
L STANDARD
10 μH
15 μH
The transconductance error amplifier gain is controlled
by its internal impedance. The external divider resistors
have no effect on system gain, so a wide range of
5.0V
12V
15V
0.23
0.21
0.22
22 μH
56 μH
68 μH
values can be used. A 10 k Ω resistor is recommended
as a good trade-off for quiescent current and noise
immunity.
? 2011 Microchip Technology Inc.
DS25004A-page 17
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