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| 型号： | MCP16301T-I/CHY |
| 厂商： | Microchip Technology |
| 文件页数： | 17/38页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 0.6A SOT23-6 |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 2 V ~ 15 V |
| 输入电压： | 4 V ~ 30 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 500kHz |
| 电流 - 输出： | 600mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-6 |
| 包装： | 标准包装 |
| 供应商设备封装： | SOT-23-6 |
| 其它名称： | MCP16301T-I/CHYDKR |
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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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