- 您现在的位置：买卖IC网 > PDF目录179918 > LTC4252A-2CMS#TRPBF (LINEAR TECHNOLOGY CORP) Negative Voltage Hot Swap Controllers; Package: MSOP; No of Pins: 10; Temperature Range: 0°C to +70°C PDF资料下载
参数资料
| 型号： | LTC4252A-2CMS#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | Negative Voltage Hot Swap Controllers; Package: MSOP; No of Pins: 10; Temperature Range: 0°C to +70°C |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO10 |
| 封装： | LEAD FREE, PLASTIC, MSOP-10 |
| 文件页数： | 24/36页 |
| 文件大小： | 394K |
| 代理商： | LTC4252A-2CMS#TRPBF |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页当前第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页
LTC4252-1/LTC4252-2
LTC4252A-1/LTC4252A-2
30
425212fb
APPLICATIO S I FOR ATIO
WU
U
Circuit Breaker with Foldback Current Limit
Figure 20 shows the LTC4252A in a foldback current limit
application. When VOUT 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, RS, as
the ACL amplifier servos the sense voltage between the
SENSE and VEE pins to about 60mV. The short-circuit
current through RS reduces as the VOUT 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 VOUT 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 dur-
ing power-up. This setup is suitable only for applications
that don’t 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:
C
IC
I
GATE
L
INRUSH
2
=
(19)
where IGATE = 58A and CL 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 VEE C2/CGS(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:
C
V
CC
SUPPLY MAX
GS TH Q
GD Q
32
1
=+
()
(),
()
(20)
C3
≈ 35 C2 for VSUPPLY(MAX) = 71V
where VGS(TH),Q1 is the MOSFET’s minimum gate thresh-
old and VSUPPLY(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 applica-
tion. 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.
Figure 19. Power Limit Circuit Breaking Application
4252-1/2 F19
GND
UV
OV
VEE
VIN
SENSE
SS
TIMER
GATE
PWRGD
DRAIN
LTC4252A-1
R1
390k
1%
R2
30.1k
1%
CT
0.68
F
CSS
68nF
CC
10nF
–48V
RS
0.02
Q1
IRF530S
VOUT
RC
10
R5
100k
R4
38.3k
D1
BZV85C43
RIN
3
× 1.8k
1/4W EACH
1
9
8
10
3
2
7
6
4
5
C1
10nF
CIN
1
F
CL
100
F
GND
(SHORT PIN)
+
RD 1M
R6 27
LOAD
EN
*
*FMMT493
相关PDF资料 |
PDF描述 |
|---|---|
| LTC4252A-2IMS#PBF | Negative Voltage Hot Swap Controllers; Package: MSOP; No of Pins: 10; Temperature Range: -40°C to +85°C |
| LTC4252A-2IMS#TRPBF | Negative Voltage Hot Swap Controllers; Package: MSOP; No of Pins: 10; Temperature Range: -40°C to +85°C |
| LTC4252-2CMS8#PBF | Negative Voltage Hot Swap Controllers; Package: MSOP; No of Pins: 8; Temperature Range: 0°C to +70°C |
| LTC4252-2CMS8#TRPBF | Negative Voltage Hot Swap Controllers; Package: MSOP; No of Pins: 8; Temperature Range: 0°C to +70°C |
| LTC4252-2IMS8#PBF | Negative Voltage Hot Swap Controllers; Package: MSOP; No of Pins: 8; Temperature Range: -40°C to +85°C |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4252A-2IMS | 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#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 |
发布紧急采购，3分钟左右您将得到回复。