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參數(shù)資料
| 型號： | LTC4223CDHD-2#PBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 14/24頁 |
| 文件大?。?/td> | 290K |
| 描述： | IC CNTRLR HOT SWAP DUAL 16-DFN |
| 標準包裝： | 73 |
| 類型： | 熱交換控制器 |
| 應用： | ATCA，MicroTCA? |
| 內(nèi)部開關： | 無 |
| 電源電壓： | 2.7 V ~ 6 V |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-WFDFN 裸露焊盤 |
| 供應商設備封裝： | 16-DFN（5x4） |
| 包裝： | 管件 |
LTC4223-1/LTC4223-2
14
422312f
APPLICATIONS INFORMATION
There are two different modes of fault time-out for the 3.3V
auxiliary supply: adjustable delay through TIMER capacitor
during power-up when
?/DIV>
A
?/DIV>
U
?/DIV>
X
?/DIV>
P
?/DIV>
G
?/DIV>
O
?/DIV>
O
?/DIV>
D not asserted; xed
25約 delay after power-up when
?/DIV>
A
?/DIV>
U
?/DIV>
X
?/DIV>
P
?/DIV>
G
?/DIV>
O
?/DIV>
O
?/DIV>
D asserted
low. Under the situation whereby AUXON toggles low then
high for short duration after power-up while
?/DIV>
A
?/DIV>
U
?/DIV>
X
?/DIV>
P
?/DIV>
G
?/DIV>
O
?/DIV>
O
?/DIV>
D
still pulling low due to output load capacitor, 25約 fault
time-out applies.
When the auxiliary supply is powered up into an output
short, the ACL ampli er will regulate the gate of the
internal pass transistor to produce 240mA output cur-
rent. At this time a 10糀 pull-up current starts charging
up the TIMER pin capacitor until it exceeds its threshold
(1.235V). The internal pass transistor then turns off and
?/DIV>
F
?/DIV>
A
?/DIV>
U
?/DIV>
L
?/DIV>
T pulls low. Thereafter, the TIMER is discharged by
a 2糀 pull-down current. The fault lter delay is given by
C
T
" 123[ms/糉].
After a successful power-up cycle, the ACL ampli er pro-
tects the auxiliary supply from overcurrent by pulling down
the gate of the internal pass transistor rapidly as shown
in Figure 7. Thereafter, the gate recovers and servos the
output current to about 240mA for 25約 before pulling
down to ground gently, turning the transistor off. At this
time,
?/DIV>
F
?/DIV>
A
?/DIV>
U
?/DIV>
L
?/DIV>
T pulls low and the 12V external MOSFET is
also turned off by the 1mA GATE pull-down current.
Whenever the 3.3V auxiliary supply trips off due to an
overcurrent fault, the 12V supply also shuts off. The
auxiliary supply is, however, unaffected by faults on the
12V supply. In either case
?/DIV>
F
?/DIV>
A
?/DIV>
U
?/DIV>
L
?/DIV>
T latches low when the
affected channels turn off, and
?/DIV>
F
?/DIV>
A
?/DIV>
U
?/DIV>
L
?/DIV>
T is cleared by tog-
gling the ON pins. Faults are cleared automatically in the
LTC4223-2 auto-retry version.
If there is signi cant supply lead inductance, a severe
output short may collapse the input to ground before the
LTC4223 can bring the current under control. In this case
the undervoltage lockout will activate after a 12約 lter
delay, and pull the gate down. Then the ACL ampli er will
take control and regulate the output in active current limit.
Under this situation, the fault time-out is set by TIMER
delay instead of 25約 lter delay.
Undervoltage Fault
An undervoltage fault occurs if either AUXIN or 12V
IN
falls
below its undervoltage threshold for longer than 12約. This
turns off the affected supplys switch instantly, but does
not clear the fault latches. Further, an undervoltage fault
on one supply does not affect the operation of the other
supply. If the bias supply input, V
CC
falls below its UVLO
threshold for more than 80約, all supply switches are turned
off and the fault latches are cleared. Operation resumes
from a fresh start-up cycle when V
CC
is restored.
Figure 7. Short-Circuit Fault on 3.3V
AUX
Output
Figure 6. Short-Circuit Fault on 12V Output
5約/DIV
12V
GATE
5V/DIV
12V
OUT
5V/DIV
422312 F06
擵
SENSE
200mV/DIV
5約/DIV
AUXOUT
5V/DIV
FAULT
5V/DIV
422312 F07
I
LOAD
1A/DIV
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LTC4223CDHD-2TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual Supply Hot Swap Controller for Advanced Mezzanine Card |
| LTC4223CGN-1#PBF | 功能描述:IC CNTRLR HOT SWAP DUAL 16-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 標準包裝:50 系列:- 類型:熱交換控制器 應用:-48V 遠程電力系統(tǒng)，AdvancedTCA ? 系統(tǒng)，高可用性 內(nèi)部開關:無 電流限制:可調(diào) 電源電壓:11.5 V ~ 14.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬） 供應商設備封裝:10-MSOP 包裝:管件 |
| LTC4223CGN-1#TRPBF | 功能描述:IC CNTRLR HOT SWAP DUAL 16-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 標準包裝:50 系列:- 類型:熱交換控制器 應用:-48V 遠程電力系統(tǒng)，AdvancedTCA ? 系統(tǒng)，高可用性 內(nèi)部開關:無 電流限制:可調(diào) 電源電壓:11.5 V ~ 14.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬） 供應商設備封裝:10-MSOP 包裝:管件 |
| LTC4223CGN-1PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual Supply Hot Swap Controller for Advanced Mezzanine Card |
| LTC4223CGN-1TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual Supply Hot Swap Controller for Advanced Mezzanine Card |
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