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參數(shù)資料
| 型號： | LTC4216IDE |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | Ultralow Voltage Hot Swap Controller |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO12 |
| 封裝： | 4 X 3 MM, PLASTIC, DFN-12 |
| 文件頁數(shù)： | 16/24頁 |
| 文件大?。?/td> | 277K |
| 代理商： | LTC4216IDE |
LTC4216
4216f
16
Power-Up into an Output-Short
Figure 10 shows the timing diagram in the case when the
output is a dead short during power-up. As GATE ramps
up at time point 6, the MOSFET current increases due to
the output short causing the voltage drop across the sense
resistor to rise above 25mV. FILTER sources 60μA, charg-
ing the external capacitor. At time point 7, GATE regulates
to limit the output current to 40mV/R
SENSE
. If the output
continues to be in analog current limit when the FILTER
pin voltage reaches its threshold (1.253V) at time point
8, the circuit breaker trips and GATE is pulled low. The
device latches-off and
F
A
U
L
T is pulled low, indicating a
fault condition. The FILTER capacitor discharges through
a 2.4μA pull-down until the device resets.
Resetting the Electronic Circuit Breaker
When the LTC4216’s electronic circuit breaker is tripped
during a fault condition,
F
A
U
L
T is asserted low and the
R
E
S
E
T, SS and GATE pins are all pulled to ground. This is
shown in the timing diagram of Figure 11. The LTC4216
remains latched-off until the external fault is cleared. To
clear the internal fault latch and restart the device, pull
the ON pin low (< 0.4V) at time point 4 for at least 100μs,
after which the
F
A
U
L
T will go high at time point 5. Tog-
gling the ON pin from low to high (> 0.8V) initiates a new
start-up cycle.
Sense Resistor Considerations
The circuit breaker trip threshold of 25mV and the value of
the sense resistor, R
SENSE
, connected between the SENSEP
and SENSEN pins, determine the trip current level as given
by Equation (10). If the fault current level exceeds the
analog current limit, the current is limited to a value given
by Equation (11). Should the overload condition exist for
more than one fault filter delay as given by Equation (2),
the circuit breaker trips and the device is latched-off.
I
V
R
mV
R
TRIP CB
CB TH
(
SENSE
SENSE
(
)
)
=
=
25
(10)
For a new circuit design, the sense resistor value is first
calculated from the maximum operating load current under
normal conditions and the minimum circuit breaker trip
threshold. This is given by:
V
I
LOAD MAX
(
)
I
V
R
mV
R
ACL
ACL TH
SENSE
SENSE
=
=
(
)
40
(11)
R
mV
I
SENSE
CB THMIN
(
LOAD MAX
=
=
,
)
(
)
.
21 5
(12)
Figure 10. Power-Up into an Output-Short and
Circuit Breaker Trips
Figure 11. Mild Overcurrent Circuit Breaker Trips Followed by
Device Reset
TIMER
2.4
μ
A
2
μ
A
40mV
25mV
10
μ
A
10
μ
A
1
μ
A
1
2 3
4 5 6 7
8
4216 F10
0.8V
TRACKS SS RAMP
FPD
60
μ
A
SENSEP-SENSEN
FILTER
SS
GATE
V
OUT
ON
FAULT
RESET
V
FILT(TH)
V
TMR(TH)
V
GATE
– V
OUT
< V
GS(TH)
FAULT
FILTER
DELAY
GATE
REGULATING
2.4
μ
A
<40mV
25mV
4216 F11
FPD
60
μ
A
t
RST(ONLO)
V
FILT(TH)
SENSEP-SENSEN
FILTER
FAULT
RESET
SS
GATE
V
OUT
1
ON
0.4V
POWER BAD
V
FB
< 0.6V
2 3
4
5
MILD
OVERCURRENT
FAULT LATCH
RESET
CIRCUIT BREAKER TRIPS
AND LATCHED-OFF
RESET PULLED LOW
DUE TO POWER BAD
APPLICATIU
W
U
U
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| LTC4216IDE#PBF | 功能描述:IC CNTRLR HOT SWAP 12-DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 類型:熱交換控制器 應(yīng)用:-48V 遠程電力系統(tǒng)，AdvancedTCA ? 系統(tǒng)，高可用性 內(nèi)部開關(guān):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(yīng)商設(shè)備封裝:10-MSOP 包裝:管件 |
| LTC4216IDE#TR | 制造商:Linear Technology 功能描述:Hot Swap Controller 1-CH 6V 12-Pin DFN EP T/R |
| LTC4216IDE#TRPBF | 功能描述:IC CNTRLR HOT SWAP 12-DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 類型:熱交換控制器 應(yīng)用:-48V 遠程電力系統(tǒng)，AdvancedTCA ? 系統(tǒng)，高可用性 內(nèi)部開關(guān):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(yīng)商設(shè)備封裝:10-MSOP 包裝:管件 |
| LTC4216IMS | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Ultralow Voltage Hot Swap Controller |
| LTC4216IMS#PBF | 功能描述:IC CNTRLR HOT SWAP 10-MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 類型:熱交換控制器 應(yīng)用:-48V 遠程電力系統(tǒng)，AdvancedTCA ? 系統(tǒng)，高可用性 內(nèi)部開關(guān):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(yīng)商設(shè)備封裝:10-MSOP 包裝:管件 |
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