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參數(shù)資料
| 型號： | MCP1612 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | Single 1A, 1.4 MHz Synchronous Buck Regulator |
| 中文描述： | 單1A條，1.4 MHz的同步降壓穩(wěn)壓器 |
| 文件頁數(shù)： | 13/22頁 |
| 文件大?。?/td> | 230K |
| 代理商： | MCP1612 |
2005 Microchip Technology Inc.
DS21921B-page 13
MCP1612
Solving for C:
There will also be some ripple voltage caused by the
ESR of the capacitor. The ripple is defined as follows.
EQUATION 5-7:
For this example:
5.2.4
For the buck topology, the input current is pulled from
the source and the input capacitor in pulses. The size
of the input capacitor will determine the amount of
current pulled from the source. For most applications,
a 10 μF ceramic capacitor connected between the
MCP1612’s V
IN
and P
GND
is recommended to filter the
current pulses. Less capacitance can be used for
applications that have low source impedance. The
ripple current rating for ceramic capacitors are typically
very high due to their low loss characteristics. Low-cost
electrolytic capacitors can be used, but their ripple
current rating should not be exceeded.
INPUT CAPACITOR
5.2.5
V
CC
INPUT
The V
CC
input is used to bias the internal MCP1612
circuitry. A 10
Ω
resistor is recommended between the
unregulated inputs V
IN
and V
CC
, along with a 0.1 μF
capacitor to ground to help isolate the V
CC
pin from the
switching noise.
5.2.6
COMPENSATION COMPONENTS
An internal transconductance error amplifier is used to
compensate the buck converter. An external resistor
(R
C
) and capacitor (C
C
), connected between COMP
and GND, are all that is needed to provide a high-
bandwidth loop.
Table 5-1 identifies values for R
C
and C
C
for standard
buck inductor (L) and output capacitor (C
OUT
) values.
TABLE 5-1:
R
C
and C
C
VALUES
L
C
OUT
3.3 μH
10.0 μF
2.2 μH
4.7 μF
5.3
Printed Circuit Board (PCB)
Layout
The MCP1612 is capable of switching over 1A at
1.4 MHz. As with all high-frequency switching power
supplies, good PCB layout techniques are essential to
prevent noise generated by the switching power-train
from interfering with the sensing circuitry.
There are two ground pins (P
GND
and A
GND
) on the
MCP1612 to separate the large-signal ground current
from the small-signal circuit ground. These two
grounds should be kept separate, only connecting near
the input bulk capacitor.
Care must also be taken to minimize the length and
loop area of the large signal connections. Components
connected to this loop consist of the input bulk
capacitor, V
IN
, P
GND
and L
X
pins of the MCP1612, the
buck inductor and the output filter capacitor.
I
C
= 165 mA
C = 4.7 μF
Δ
t = 260 ns
ESR = 8 m
Ω
Δ
V
C
= (260 ns x 165 mA)/4.7 μF
Δ
V
C
= 9.13 mV
V
ESRRIPPLE
= 8 m
Ω
x 165 mA
V
ESRRIPPLE
= 1.32 mV
Δ
V
OUT
=
Δ
V
C
+ V
ESRRIPPLE
Δ
V
OUT
= 9.13 mV + 1.32 mV
Δ
V
OUT
= 10.45 mV
C
I
C
t
V
C
----------
×
=
Where:
I
C
= peak-to-peak ripple current
Δ
t = on-time of P-channel MOSFET
Δ
V
C
= output ripple voltage
V
ESRRIPPLE
ESR
I
C
×
=
R
C
C
C
25 k
Ω
10 k
Ω
1000 pF
1000 pF
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MCP1612_13 | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Single 1A, 1.4 MHz Synchronous Buck Regulator |
| MCP1612-120I/MS | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 1.4MHz 1A Synch-Buck RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| MCP1612-150I/MS | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 1.4MHz 1A Synch-Buck RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| MCP1612-180I/MS | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 1.4MHz 1A Synch-Buck RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| MCP1612-250I/MS | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 1.4MHz 1A Synch-Buck RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
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