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参数资料
| 型号： | LTC4216CMS#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/26页 |
| 文件大小： | 311K |
| 描述： | IC CNTRLR HOT SWAP 10-MSOP |
| 标准包装： | 2,500 |
| 类型： | 热交换控制器 |
| 应用： | 通用 |
| 内部开关： | 无 |
| 电源电压： | 2.3 V ~ 6 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 10-MSOP |
| 包装： | 带卷 (TR) |
LTC4216
11
4216fa
For more information www.linear.com/LTC4216
applicaTions inForMaTion
Electronic Circuit Breaker
The LTC4216 features an electronic circuit breaker function
that protects the external MOSFET against short-circuits or
excessive load current conditions on the supply. An external
sense resistor connected between SENSEP and SENSEN
pins is used to measure the load current. If the voltage
across the sense resistor exceeds the circuit breaker trip
threshold of 25mV for more than a fault filter delay, the
gate of the MOSFET is pulled low, turning it off.
The fault filter delay is determined by a capacitor, C3, con-
nected between the FILTER pin and ground as in Equation
(2). The FILTER pin sources 60礎 pull-up current when the
sense voltage across the sense resistor exceeds 25mV.
Otherwise, it pulls down with 2.4礎. When the FILTER
pin voltage exceeds V
FILT(TH)
threshold (1.253V), there
is an internal 20祍 delay before the GATE pulls low and
the FAULT pin will be pulled low. If no FILTER capacitor
is used, the filter fault delay defaults to 20祍. The circuit
breaker response time or fault filter delay with the FILTER
capacitor, C3, is given by:
t
V C
A
s
CB TRIP
(
)
.
"
=
?/DIV>
+ ?/DIV>
1 253
3
60
20
(2)
The FILTER capacitor, C3, should be chosen so that the
fault filter delay is not too short to trip the circuit breaker
as the MOSFET current charges up a large output load
capacitance in analog current limit during power-up. It
also should not be too long to exceed the safe operating
area (SOA) of the external MOSFET.
Intermittent overloads may exceed the current limit as in
Figure 5, but if the duration is sufficiently short, the FILTER
pin voltage may not reach the V
FILT(TH)
threshold and the
device will not shut off. To handle this situation, the FILTER
discharges with 2.4礎 whenever voltage across the sense
resistor is below 25mV. Any intermittent overload with
an aggregate duty cycle of more than 4% will eventually
trip the circuit breaker. Figure 6 shows the circuit breaker
response time in seconds normalized to 1礔 as given by
Equation (3). The asymmetric charging and discharging
of FILTER is a fair gauge of MOSFET heating.
t
C
s F
D
3
1 253
60
2 4
( / )
.
( " ) .
?nbsp =
(3)
Following a circuit breaker trip, the device is latched-off
and FAULT is pulled low until the fault latch is cleared by
pulling the ON pin low (< 0.4V) for at least 100祍. The
FILTER pin is pulled low by an internal N-channel switch
to discharge the capacitor quickly when the ON pin volt-
age falls below 0.4V and pulls down with 2.4礎 when the
ON pin voltage rises above 0.8V to initiate a new start-up
cycle. The new timing cycle will not start until the FILTER
pin voltage is below 0.2V. The electronic circuit breaker
is disabled during the first timing cycle upon start-up and
any short-circuit faults will be ignored.
Figure 4. A Continuous Fault Timing
Figure 5. Multiple Intermittent Overcurrent Condition
V
FILTER
CIRCUIT BREAKER TRIPS
A
B
1.253V
NORMAL
MODE
FAULT
MODE
2.4礎
60礎
4216 F04
A1
I
LOAD
V
FILTER
V
GATE
CIRCUIT
BREAKER
TRIPS
1.253V
B1
CB
FAULT
CB
FAULT
CB
FAULT
A2
B2
A3
B3
25mV/R
SENSE
60礎
60礎
60礎
2.4礎
2.4礎
2.4礎
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4216IDE | 制造商:Linear Technology 功能描述:Hot Swap Controller 1-CH 6V 12-Pin DFN EP |
| LTC4216IDE#PBF | 功能描述:IC CNTRLR HOT SWAP 12-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 标准包装:50 系列:- 类型:热交换控制器 应用:-48V 远程电力系统，AdvancedTCA ? 系统，高可用性 内部开关:无 电流限制:可调 电源电压:11.5 V ~ 14.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-MSOP 包装: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 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 标准包装:50 系列:- 类型:热交换控制器 应用:-48V 远程电力系统，AdvancedTCA ? 系统，高可用性 内部开关:无 电流限制:可调 电源电压:11.5 V ~ 14.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-MSOP 包装:管件 |
| LTC4216IMS | 制造商:LINER 制造商全称:Linear Technology 功能描述:Ultralow Voltage Hot Swap Controller |
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