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| 型号： | LTC4252A-2IMS |
| 厂商： | Linear Technology |
| 文件页数： | 30/36页 |
| 文件大小： | 328K |
| 描述： | IC CTRLR HOTSWAP NEG VOLT 10MSOP |
| 标准包装： | 50 |
| 类型： | 热交换控制器 |
| 应用： | 通用 |
| 内部开关： | 无 |
| 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 |
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LTC4252-1/LTC4252-2
LTC4252A-1/LTC4252A-2
30
425212fe
For more information www.linear.com/LTC4252-1
applicaTions inForMaTion
425212 F19
48RTN
UV
OV
V
EE
V
IN
SENSE
SS
TIMER
GATE
PWRGD
DRAIN
LTC4252A-1
R1
392k
1%
R2
30.1k
1%
C
T
0.68礔
C
SS
68nF
C
C
10nF
48V
R
S
0.02
Q1
IRF530S
V
OUT
R
C
10
R5
100k
R4
38.3k
D1
BZV85C43
R
IN
3?1.8k
1/4W EACH
1
9
8
10
3
2
7
6
4
5
C1
10nF
C
IN
1礔
C
L
100礔
48RTN
(SHORT PIN)
+
R
D
1M
R6 27
LOAD
EN
*
*FMMT493
**DIODES, INC
RECOMMENDED FOR HARSH ENVIRONMENTS
D
IN
DDZ13B
**
Figure 19. Power Limit Circuit Breaking Application
Circuit Breaker with Foldback Current Limit
Figure 20 shows the LTC4252A in a foldback current limit
application. When V
OUT
is shorted to the 48V RTN supply,
current flows through resistors R4 and R5. This results in
a voltage drop across R5 and a corresponding reduction
in voltage drop across the sense resistor, R
S
, as the ACL
amplifier servos the sense voltage between the SENSE
and V
EE
pins to about 60mV . The short-circuit current
through R
S
reduces as the V
OUT
voltage increases during
an output short-circuit condition. Without foldback current
limiting resistor R5, the current is limited to 3A during
analog current limit. With R5, the short-circuit current is
limited to 0.5A when V
OUT
is shorted to 71V .
Inrush Control Without a Sense Resistor
During Power-Up
Figure 21 shows the LTC4252A in an application where the
inrush current is controlled without a sense resistor during
power-up. This setup is suitable only for applications that
dont require short-circut protection from the LTC4252A.
Resistor R4 and capacitor C2 act as a feedback network
to accurately control the inrush current. The C2 capacitor
can be calculated with the following equation:
C2=
I
GATE
"C
L
I
INRUSH
(19)
where I
GATE
= 58礎 and C
L
is the total load capacitance.
Capacitor C3 and resistor R4 prevent Q1 from momen-
tarily turning on when the power pins first make contact.
Without C3 and R4, capacitor C2 pulls the gate of Q1 up
to a voltage roughly equal to V
EE
" C2/C
GS(Q1)
before the
LTC4252A powers up. By placing capacitor C3 in parallel
with the gate capacitance of Q1 and isolating them from
C2 using resistor R4, the problem is solved. The value of
C3 is given by:
C3=
V
SUPPLY(MAX)
V
GS(TH),Q1
" C2+C
GD(Q1)
(
)
(20)
C3 H 35 " C2 for V
SUPPLY(MAX)
= 71V
where V
GS(TH),Q1
is the MOSFETs minimum gate threshold
and V
SUPPLY(MAX)
is the maximum operating input voltage.
Diode-ORing
Figure 22 shows the LTC4252 used as diode-oring with Hot
Swap capability in a dual 48V power supply application.
The conventional diode-OR method uses two high power
diodes and heat sinks to contain the large heat dissipation
of the diodes. With the LTC4252 controlling the external
FETs Q2 and Q3 in a diode-OR manner, the small turn-on
voltage across the fully enhanced Q2 and Q3 reduces the
power dissipation significantly.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4252A-2IMS#PBF | 功能描述:IC CNTRLR HOTSWAP NEGVOLT 10MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:100 系列:- 类型:热插拔开关 应用:通用 内部开关:是 电流限制:可调 电源电压:9 V ~ 13.2 V 工作温度:-40°C ~ 150°C 安装类型:表面贴装 封装/外壳:10-WFDFN 裸露焊盘 供应商设备封装:10-TDFN-EP（3x3） 包装:管件 |
| LTC4252A-2IMS#TR | 功能描述:IC CTRLR HOTSWAP NEG VOLT 10MSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:100 系列:- 类型:热插拔开关 应用:通用 内部开关:是 电流限制:可调 电源电压:9 V ~ 13.2 V 工作温度:-40°C ~ 150°C 安装类型:表面贴装 封装/外壳:10-WFDFN 裸露焊盘 供应商设备封装:10-TDFN-EP（3x3） 包装:管件 |
| LTC4252A-2IMS#TRPBF | 功能描述:IC CNTRLR HOTSWAP NEGVOLT 10MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:100 系列:- 类型:热插拔开关 应用:通用 内部开关:是 电流限制:可调 电源电压:9 V ~ 13.2 V 工作温度:-40°C ~ 150°C 安装类型:表面贴装 封装/外壳:10-WFDFN 裸露焊盘 供应商设备封装:10-TDFN-EP（3x3） 包装:管件 |
| LTC4252A-2IMSPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Negative Voltage Hot Swap Controllers |
| LTC4252A-2IMSTR | 制造商:LINER 制造商全称:Linear Technology 功能描述:Negative Voltage Hot Swap Controllers |
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