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參數(shù)資料
| 型號(hào)： | MIC2007YM6 |
| 廠商： | MICREL INC |
| 元件分類： | 電源管理 |
| 英文描述： | Adjustable Current Limit Power Distribution Switch |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO6 |
| 封裝： | LEAD FREE, SOT-23, 6 PIN |
| 文件頁數(shù)： | 11/25頁 |
| 文件大?。?/td> | 410K |
| 代理商： | MIC2007YM6 |
Micrel, Inc.
MIC20XX Family
January 2009
19
M9999-012109-A
Application Information
Setting ILIMIT
The MIC2009/2019’s current limit is user programmable
and controlled by a resistor connected between the ILIMIT
pin and Ground. The value of this resistor is determined
by the following equation:
SET
LIMIT
R
LF)
itFactor(C
CurrentLim
I
=
or
(A)
I
)
itFactor(V
CurrentLim
R
LIMIT
SET =
For example:
Set ILIMIT = 1.25 A
Looking in the Electrical specifications we will find CLF
at ILIMIT = 1 A.
Min
Typ
Max
Units
190
243
293
V
For the sake of this example, we will say the typical
value of CLF at an IOUT of 1A is 243V. Applying the
equation above:
Ω
=
Ω
4
.
194
1.25A
243V
)
(
RSET
RSET = 196
(the closest standard 1% value)
Designers should be aware that variations in the
measured ILIMIT for a given RSET resistor, will occur
because of small differences between individual ICs
(inherent in silicon processing) resulting in a spread of
ILIMIT values. In the example above we used the typical
value of CLF to calculate RSET. We can determine ILIMIT’s
spread by using the minimum and maximum values of
CLF and the calculated value of RSET.
A
97
.
0
196
190V
ILIMIT_MIN
=
Ω
=
A
5
.
1
196
260V
ILIMIT_MIN
=
Ω
=
Giving us a maximum ILIMIT variation over temperature
of:
ILIMIT_MIN
ILIMIT_TYP
ILIMIT_MAX
0.97 A
1.25 A
1.5 A
or
1.25 A – 22%
and
1.25 A + 20%
ILIMIT vs. IOUT measured
The MIC20XX’s current limiting circuitry, during current
limiting, is designed to act as a constant current source
to the load. As the load tries to pull more than the
allotted current, VOUT drops and the input to output
voltage differential increases. When VIN - VOUT exceeds
1V, IOUT drops below ILIMIT to reduce the drain of fault
current on the system’s power supply and to limit
internal heating of the switch.
When measuring IOUT it is important to bear this voltage
dependence in mind, otherwise the measurement data
may appear to indicate a problem when none really
exists. This voltage dependence is illustrated in Figures
4 and 5.
In Figure 4 output current is measured as VOUT is pulled
below VIN, with the test terminating when VOUT is 1V
below VIN. Observe that once ILIMIT is reached IOUT
remains constant throughout the remainder of the test.
In Figure 5 this test is repeated but with VIN - VOUT
exceeding 1V.
When VIN - VOUT > 1V, switch’s current limiting circuitry
responds by decreasing IOUT, as can be seen in Figure
5. In this demonstration, VOUT is being controlled and
IOUT is the measured quantity. In real life applications
VOUT is determined in accordance with Ohm’s law by the
load and the limiting current.
Figure 4. IOUT in Current Limiting for VIN
- VOUT < 1V
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| MIC2007YM6 TR | 功能描述:電源開關(guān) IC - USB Programmable Current Limit Single High-Side Switch wCslew + LdDschg - Lead Free RoHS:否 制造商:Micrel 電源電壓-最小:2.7 V 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-8 封裝:Tube |
| MIC2007YM6TR | 制造商:Micrel 功能描述:USB Power Switch Hi Side Single 0.2A, 2A |
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| MIC2007YM6TX | 功能描述:IC DISTRIBUTION SW ADJ SOT23-6 RoHS:是 類別:集成電路 (IC) >> PMIC - 電源分配開關(guān) 系列:- 特色產(chǎn)品:XRP252 Switches 標(biāo)準(zhǔn)包裝:1 系列:- 類型:高端開關(guān) 輸出數(shù):2 Rds（開）:140 毫歐 內(nèi)部開關(guān):是 電流限制:1.15A 輸入電壓:1.75 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:10-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:10-TDFN（3x3） 包裝:Digi-Reel® 其它名稱:1016-1691-6 |
| MIC2007YML | 制造商:Rochester Electronics LLC 功能描述: 制造商:RF Micro Devices Inc 功能描述: 制造商:Micrel Inc 功能描述: |
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