參數(shù)資料
型號(hào)： LTC4252-2CMS#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 電源管理
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
封裝： LEAD FREE, PLASTIC, MSOP-10
文件頁(yè)數(shù)： 24/36頁(yè)
文件大?。?/td> 394K
代理商： LTC4252-2CMS#TRPBF
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
相關(guān)PDF資料
PDF描述
LTC4252-2IMS#PBF Negative Voltage Hot Swap Controllers; Package: MSOP; No of Pins: 10; Temperature Range: -40°C to +85°C
LTC4252-2IMS#TRPBF Negative Voltage Hot Swap Controllers; Package: MSOP; No of Pins: 10; Temperature Range: -40°C to +85°C
LTC4252A-1CMS#PBF Negative Voltage Hot Swap Controllers; Package: MSOP; No of Pins: 10; Temperature Range: 0°C to +70°C
LTC4252A-1CMS#TRPBF Negative Voltage Hot Swap Controllers; Package: MSOP; No of Pins: 10; Temperature Range: 0°C to +70°C
LTC4252A-1IMS#PBF Negative Voltage Hot Swap Controllers; Package: MSOP; No of Pins: 10; Temperature Range: -40°C to +85°C
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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LTC4252-2IMS#PBF 功能描述:IC CNTRLR HOTSWAP NEGVOLT 10MSOP 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(yuǎn)程電力系統(tǒng)，AdvancedTCA ? 系統(tǒng)，高可用性 內(nèi)部開(kāi)關(guān):無(wú) 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
LTC4252-2IMS#TR 功能描述:IC CNTRLR HOTSWAP NEGVOLT 10MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:100 系列:- 類型:熱插拔開(kāi)關(guān) 應(yīng)用:通用 內(nèi)部開(kāi)關(guān):是 電流限制:可調(diào) 電源電壓:9 V ~ 13.2 V 工作溫度:-40°C ~ 150°C 安裝類型:表面貼裝 封裝/外殼:10-WFDFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:10-TDFN-EP（3x3） 包裝:管件
LTC4252-2IMS#TRPBF 功能描述:IC CNTRLR HOTSWAP NEGVOLT 10MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:100 系列:- 類型:熱插拔開(kāi)關(guān) 應(yīng)用:通用 內(nèi)部開(kāi)關(guān):是 電流限制:可調(diào) 電源電壓:9 V ~ 13.2 V 工作溫度:-40°C ~ 150°C 安裝類型:表面貼裝 封裝/外殼:10-WFDFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:10-TDFN-EP（3x3） 包裝:管件
LTC4252-2IMS8 功能描述:IC CNTRLR HOTSWAP NEGVOLT 8-MSOP RoHS:否 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(yuǎn)程電力系統(tǒng)，AdvancedTCA ? 系統(tǒng)，高可用性 內(nèi)部開(kāi)關(guān):無(wú) 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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