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參數(shù)資料
| 型號： | MIC2007YML |
| 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, DSO6 |
| 封裝： | 2 X 2 MM, LEAD FREE, MLF-6 |
| 文件頁數(shù)： | 14/25頁 |
| 文件大?。?/td> | 410K |
| 代理商： | MIC2007YML |
Micrel, Inc.
MIC20XX Family
January 2009
21
M9999-012109-A
require dual current limits on their peripheral ports. The
MIC20X6 is designed for systems demanding two
primary current limiting levels but without the use of a
control signal to select between current limits.
To better understand how the MIC20X6 provides this,
imagine a system whose main power supply supports
heavy loads during normal operation, but in sleep mode
is reduced to only few hundred milliamps of output
current. In addition, this system has several USB ports
which must remain active during sleep. In normal
operation, each port can support a 500mA peripheral,
but in sleep mode their combined output current is
limited to what the power supply can deliver minus
whatever the system itself is drawing.
If a peripheral device is plugged in which demands more
current than is available, the system power supply will
sag, or crash. The MIC20X6 prevents this by monitoring
both the load current and VIN. During normal operation,
when the power supply can source plenty of current, the
MIC20X6 will support any load up to its factory
programmed current limit. When the weaker, standby
supply is in operation, the MIC20X6 monitors VIN and
will shut off its output should VIN dip below a
predetermined value. This predetermined voltage is user
programmable and set by the selection of the resistor
divider driving the VUVLO pin.
To prevent false triggering of the VUVLO feature, the
MIC20X6 includes a delay timer to blank out momentary
excursions below the VUVLO trip point. If VIN stays
below the VUVLO trip point for longer than 32ms
(typical), then the load is disengaged and the MIC20X6
will wait 128ms before reapplying power to the load. If
VIN remains below the VUVLO trip point, then the load
will be powered for the 32ms blanking period and then
again disengaged. This is illustrated in the scope plot
below. If VIN remains above the VUVLO trip point
MIC20X6 resumes normal operation.
Figure 9. VUVLO Operation
VUVLO and Kickstart operate independently in the
MIC2016. If the high current surge allowed by Kickstart
causes VIN to dip below the VUVLO trip point for more
than 32ms, VUVLO will disengage the load even though
the Kickstart timer has not timed out.
VIN
VOUT
VUVLO
Input
Supply
R1
R2
+
IIN_LOAD
Calculating VUVLO resistor divider values
Selection of R1 and R2 is driven by the input voltage at
which VUVLO should go into effect and the allowed
loading of the input supply. The VUVLO pin input
voltage is the result of the voltage division of VIN by the
voltage divider comprised of R1 and R2. We know
VVUVLO_TH = 250 mV, then by choosing a VIN trip voltage
(VTRIP) we know the voltage divider ratio formed by R1
and Then an R2.is chosen such that the series
resistance R1 + R2 results in a small IIN_LOAD.
And then the VUVLO trip voltage as it relates to the
comparator threshold and the resistor divider:
()
X
=
+
=
1
2
TRIP
VUVLO_TH
R
V
Rearranging these:
() 2
1
R
*
1
R
X
=
Choose an R2 that minimizes the IIN_LOAD current yet at
the same time is less than input impedance of the
VUVLO pin. The VUVLO pin internally is connected to a
comparator with an extremely high input impedance. It is
recommended that R2 not exceed 1 M. R2 can then be
calculated from the equation above.
For example:
VTRIP = 4.75V for a 5V supply
VVUVLO_TH = 250mV
R2 = 750k
Substituting these values into the equation above:
05263
.
0
V
0.25
V
4.75
V
TRIP
VUVLO_TH
=
X
()
Ω
=
Ω
=
k
667
,
41
k
750
*
05263
.
0
1
05263
.
0
R1
R1 = 41,667k
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