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參數(shù)資料
| 型號： | LTC4215CUFD-2#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC24 |
| 封裝： | 4 X 5 MM, LEAD FREE, PLASTIC, MO-220, QFN-24 |
| 文件頁數(shù)： | 6/28頁 |
| 文件大?。?/td> | 261K |
| 代理商： | LTC4215CUFD-2#TRPBF |
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LTC4215/LTC4215-2
14
4215fe
APPLICATIONS INFORMATION
subsequently falls back below the threshold for 100ms,
the GATE is allowed to turn on again unless overvoltage
auto-retry has been disabled by clearing bit A0.
Undervoltage Fault
An undervoltage fault occurs when the UV pin falls below
its 1.235V threshold for more than 2μs. This turns off the
GATE with a 1mA current to ground and sets undervoltage
present bit C1 and undervoltage fault bit D1. If the UV pin
subsequently rises above the threshold for 100ms, the
GATE is turned on again unless undervoltage auto-retry has
been disabled by clearing bit A1. When power is applied
to the device, if UV is below its 1.235V threshold after
INTVCC crosses its 2.64V undervoltage lockout threshold,
an undervoltage fault is logged in the fault register.
Board Present Change of State
Whenever the EN pin toggles, bit D4 is set to indicate a
change of state. When the EN pin goes high, indicating
board removal, the GATE turns off immediately (with a 1mA
current to ground) and clears the board present bit, C4. If
the EN pin is pulled low, indicating a board insertion, all
fault bits except D4 are cleared and enable bit, C4, is set.
If the EN pin remains low for 100ms the state of the ON
pin is captured in ‘FET On’ control bit A3. This turns the
switch on if the ON pin is tied high. There is an internal
10μA pull-up current source on the EN pin.
If the system shuts down due to a fault, it may be desirable
to restart the system simply by removing and reinserting
a load card. In cases where the LTC4215 and the switch
reside on a backplane or midplane and the load resides on
a plug-in card, the EN pin detects when the plug-in card is
removed. Figure 4 shows an example where the EN pin is
used to detect insertion. Once the plug-in card is reinserted
the fault register is cleared (except for D4). After 100ms
the state of the ON pin is latched into bit A3 of the control
register. At this point the system starts up again.
Figure 3. Short-Circuit Waveforms
VGATE
10V/DIV
VSOURCE
10V/DIV
VDD
10V/DIV
ILOAD
10A/DIV
5μs/DIV
4215 F03
RS = 5mΩ
CL = 0
RSHORT = 1Ω
R6 = 30k
C1 = 0.1μF
pin is then brought down and regulated in order to limit the
current sense voltage to 75mV. When the 20μs (LTC4215)
or 420μs (LTC4215-2) circuit breaker time out has expired,
the overcurrent present bit C2 is set. The external MOSFET
is turned off and the overcurrent fault bit D2 is set.
After the MOSFET is turned off, the TIMER capacitor
begins discharging with a 2μA pulldown current. When
the TIMER pin reaches its 0.2V threshold the MOSFET is
allowed to turn on again if the overcurrent fault has been
cleared. However, if the overcurrent auto-retry bit, A2 has
been set then the MOSFET turns on again automatically
without resetting the overcurrent fault. Use a minimum
value of 10nF for CT. If the TIMER pin is bypassed by tying
it to INTVCC, the part is allowed to turn on again after an
internal 5 second timer has expired, in the same manner
as the TIMER pin passing its 0.2V threshold.
Overvoltage Fault
An overvoltage fault occurs when either the OV pin rises
above its 1.235V threshold, or the VDD pin rises above its
15.6V threshold, for more than 2μs. This shuts off the GATE
with a 1mA current to ground and sets the overvoltage
present bit C0 and the overvoltage fault bit D0. If the pin
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| LTC4215IUFD-2 | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC24 |
| LTC4215IUFD-3#TR | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC24 |
| LTC4215CUFD-3#TRPBF | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC24 |
| LTC4215CUFD-3 | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC24 |
| LTC4215IUFD-3#PBF | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC24 |
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