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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)： | 15/25頁 |
| 文件大?。?/td> | 410K |
| 代理商： | MIC2007YML |
Micrel, Inc.
MIC20XX Family
January 2009
22
M9999-012109-A
In this example we have used the nominal value of
VVUVLO_TH. By substituting in the min and max values of
VVUVLO_TH, R1 and R2 the VUVLO trip point window can
be established.
The VUVLO comparator uses no Hysteresis. This is
because the VUVLO blanking timer prevents any
chattering that might otherwise occur if VIN varies about
the trigger point. The timer is reset by upward crossings
of the trip point such that VIN must remain below the trip
point for the full 32ms period for load disengagement to
occur.
In selecting a VTRIP voltage the designer is cautioned to
not make this value less than 2.5V. A minimum of 2.5V
is required for the MIC20X6’s internal circuitry to operate
properly. VUVLO trip points below 2.5V will result in
erratic or unpredictable operation.
Kickstart
2003
2004
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2015
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Only parts in white boxes have Kickstart.
(Not available in 5-pin SOT-23 packages).
Kickstart allows brief current surges to pass to the load
before the onset of normal current limiting, which
permits dynamic loads to draw bursts of energy without
sacrificing system safety.
Functionally, Kickstart is a forced override of the normal
current limiting function provided by the switch. The
Kickstart period is governed by an internal timer which
allows current to pass up to the secondary current limit
(ILIMIT_2nd) to the load for 128ms and then normal
(primary) current limiting goes into action.
During Kickstart a secondary current limiting circuit is
monitoring output current to prevent damage to the
switch, as a hard short combined with a robust power
supply can result in currents of many tens of amperes.
This secondary current limit is nominally set at 4A and
reacts immediately and independently of the Kickstart
period. Once the Kickstart timer has finished its count
the primary current limiting circuit takes over and holds
IOUT to its programmed limit for as long as the excessive
load persists.
Once the switch drops out of current limiting the
Kickstart timer initiates a lock-out period of 128ms such
that no further bursts of current above the primary
current limit, will be allowed until the lock-out period has
expired.
Kickstart may be over-ridden by the thermal protection
circuit and if sufficient internal heating occurs, Kickstart
will be terminated and IOUT
0A. Upon cooling, if the
load is still present IOUT
ILIMIT, not ILIMIT_2nd.
Figure 10. Kickstart
Automatic Load Discharge
2003
2004
2005
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2014
2015
2016
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2018
2019
Only parts in white boxes have automatic load discharge.
Automatic discharge is a valuable feature when it is
desirable to quickly remove charge from the VOUT pin.
This allows for a quicker power-down of the load. This
also prevents any charge from being presented to a
device being connected to the VOUT pin, for example,
USB, 1394, PCMCIA, and CableCARD.
Automatic discharge is performed by a shunt MOSFET
from VOUT pin to GND. When the switch is disabled, a
break before make action is performed turning off the
main power MOSFET and then enabling the shunt
MOSFET. The total resistance of the MOSFET and
internal resistances is typically 126.
Supply Filtering
A minimum 1μF bypass capacitor positioned close to
the VIN and GND pins of the switch is both good design
practice and required for proper operation of the switch.
This will control supply transients and ringing. Without a
bypass capacitor, large current surges or a short may
cause sufficient ringing on VIN (from supply lead
inductance) to cause erratic operation of the switch’s
control circuitry. For best performance good quality, low
ESR capacitors are recommended, preferably ceramic.
When bypassing with capacitors of 10μF and up, it is
good practice to place a smaller value capacitor in
parallel with the larger to handle the high frequency
components of any line transients. Values in the range
of 0.01μF to 0.1μF are recommended. Again, good
quality, low ESR capacitors should be chosen.
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