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參數(shù)資料
| 型號： | MIC2207 |
| 廠商： | Micrel Semiconductor,Inc. |
| 英文描述： | 3mmx3mm 2MHz 3A PWM Buck Regulator |
| 中文描述： | 3mmx3mm 2MHz的3A PWM降壓調(diào)節(jié) |
| 文件頁數(shù)： | 11/21頁 |
| 文件大?。?/td> | 780K |
| 代理商： | MIC2207 |
Micrel
MIC2207
Therefore, peak to peak ripple current is;
(
)
L
2MHz
V
V
V
V
I
IN
OUT
OUT
IN
pk
pk
×
×
=
Since the average peak to peak current is equal to
the load current. The actual peak (or highest current
the inductor will see in a steady state condition) is
equal to the output current plus the peak to peak
current.
(
)
L
2MHz
2
V
V
V
V
I
I
IN
OUT
OUT
IN
OUT
pk
×
×
×
+
=
Figure 4 demonstrates the off-time.
During the off-
time, the high-side internal P-channel MOSFET
turns off. Since the current in the inductor has to
discharge, the current flows through the free-
wheeling Schottky diode to the output. In this case,
the inductor discharge rate is (where V
D
is the diode
forward voltage);
(
)
L
The total off time can be calculated as;
D
1
T
OFF
=
V
V
D
OUT
+
2MHz
Figure 4. Off-Time
Discontinuous Operation
Discontinuous operation is when the inductor current
discharges to zero during the off cycle. Figure 5.
demonstrates the switch voltage and inductor
currents during discontinuous operation.
Figure 5. Discontinuous Operation
When the inductor current (I
L
) has completely
discharged, the voltage on the switch node rings at
the
frequency
determined
capacitance and the inductor value. In figure 5, it is
drawn as a DC voltage, but to see actual operation
(with ringing) refer to the functional characteristics.
Discontinuous mode of operation has the advantage
over full PWM in that at light loads, the MIC2207 will
skip pulses as nessasary, reducing gate drive
losses, drastically improving light load efficiency.
Efficiency Considerations
Calculating the efficiency is as simple as measuring
power out and dividing it by the power in;
P
Efficiency
IN
Where input power (P
IN
) is;
I
V
P
×
=
by
the
parasitic
100
P
OUT
×
=
IN
IN
IN
and output power (P
OUT
) is calculated as;
I
V
P
×
=
OUT
OUT
OUT
The Efficiency of the MIC2207 is determined by
several factors.
Rdson (Internal P-channel Resistance)
Diode conduction losses
Inductor Conduction losses
Switching losses
Rdson losses
are caused by the current flowing
through the high side P-channel MOSFET. The
amount of power loss can be approximated by;
D
I
R
P
2
OUT
DSON
SW
×
×
=
April 2005
11
M9999-040705
www.micrel.com
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| MIC2213-1.8 | Sequenced Portable Power Management IC |
| MIC2213-2.6 | Sequenced Portable Power Management IC |
| MIC2213-2.85BML | Sequenced Portable Power Management IC |
| MIC2213-AABML | Sequenced Portable Power Management IC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MIC2207_10 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:3mm x 3mm 2MHz 3A PWM Buck Regulator |
| MIC2207YML | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:3mmx3mm 2MHz 3A PWM Buck Regulator |
| MIC2207YML TR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 3A 2MHz Integrated Switch Buck Regulator (Lead Free) RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| MIC2207YML-EV | 功能描述:MIC2207 - DC/DC, Step Down 1, Non-Isolated Outputs Evaluation Board 制造商:microchip technology 系列:- 零件狀態(tài):有效 主要用途:DC/DC，步降 輸出和類型:1，非隔離 功率 - 輸出:- 電壓 - 輸出:1.8V 電流 - 輸出:3A 電壓 - 輸入:2.7 V ~ 5.5 V 穩(wěn)壓器拓?fù)?降壓 頻率 - 開關(guān):2MHz 板類型:完全填充 所含物品:板 使用的 IC/零件:MIC2207 標(biāo)準(zhǔn)包裝:1 |
| MIC2207YMLTR | 制造商:Micrel 功能描述:DC-DC Converter Single Buck 2.7 - 5.5V |
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