参数资料
型号: LTC4214-2CMS#PBF
厂商: Linear Technology
文件页数: 28/32页
文件大小: 277K
描述: IC CTRLR HOTSWAP NEGVOLT 10MSOP
标准包装: 50
类型: 热交换控制器
应用: 通用
内部开关:
电源电压: 6 V ~ 16 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: 管件
LTC4214-1/LTC4214-2
28
421412f
APPLICATIO  S I FOR  ATIO
U
U
U
Figure 16. Current Limit Behavior (All Waveforms are Referenced to V
EE
)
(16a) Analog Current Limit Fault
(16b) Fast Current Limit Fault
Analog Current Limit and Fast Current Limit
In Figure 16a, when SENSE exceeds V
ACL
, GATE is regu-
lated by the analog current limit amplifier loop. When
SENSE drops below V
ACL
, GATE is allowed to pull up. In
Figure 16b, when a severe fault occurs, SENSE exceeds
V
FCL
 and GATE immediately pulls down until the analog
current amplifier can establish control. If the severe fault
causes V
OUT
to exceed V
DRNCL
, the DRAIN pin is clamped
at V
DRNCL
. I
DRN
 flows into the DRAIN pin and is multiplied
by 8. This extra current is added to the TIMER pull-up
current of 40礎. This accelerated TIMER current of
[40礎+8 " I
DRN
] produces a shorter circuit breaker fault
delay. Careful selection of C
T
, R
D
 and MOSFET can help
prevent SOA damage in a low impedance fault condition.
TIMER
GATE
SENSE
V
OUT
V
ACL
V
CB
SS
DRAIN
V
TMRH
40礎 + 8 " I
DRN
4214 F16
PWRGD
5礎
5礎
TIMER
GATE
SENSE
V
OUT
V
ACL
V
CB
V
FCL
SS
DRAIN
V
TMRH
V
DRNCL
40礎 + 8 " I
DRN
PWRGD
1
2
1
4
3
2
CB TIMES OUT
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