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参数资料
| 型号： | LTC4252-2CMS8#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: 8; Temperature Range: 0°C to +70°C |
| 中文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封装： | LEAD FREE, PLASTIC, MSOP-8 |
| 文件页数： | 6/36页 |
| 文件大小： | 336K |
| 代理商： | LTC4252-2CMS8#TRPBF |
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LTC4252-1/LTC4252-2
LTC4252A-1/LTC4252A-2
14
425212fc
SHUNT REGULATOR
A fast responding shunt regulator clamps the VIN pin to 13V
(VZ). Power is derived from –48RTN by an external current
limiting resistor, RIN. A 1μF decoupling capacitor, CIN filters
supply transients and contributes a short delay at start-up.
To meet creepage requirements RIN may be split into two or
more series connected units. This introduces a wider total
spacing than is possible with a single component while at
the same time ballasting the potential across the gap under
each resistor. The LTC4252 is fundamentally a low voltage
device that operates with –48V as its reference ground. To
further protect against arc discharge into its pins, the area
in and around the LTC4252 and all associated components
should be free of any other planes such as chasis ground,
return, or secondary-side power and ground planes.
VIN may be biased with additional current up to 30mA to
accomodate external loading such as the PWRGD opto-
coupler shown in Figure 23. As an alternative to running
higher current, simply buffer VIN with an emitter follower
as shown in Figure 3. Another method shown in Figure
19 cascodes the PWRGD output.
VIN is rated handle 30mA within the thermal limits of the
package, and is tested to survive a 100μs, 100mA pulse. To
protect VIN against damage from higher amplitude spikes,
clamp VIN to VEE with a 13V Zener diode. Star connect
VEE and all VEE-referred components to the sense resistor
APPLICATIONS INFORMATION
Kelvin terminal as illustrated in Figure 3, keeping trace
lengths between VIN, CIN, DIN and VEE as short as possible.
INTERNAL UNDERVOLTAGE LOCKOUT (UVLO)
A hysteretic comparator, UVLO, monitors VINforundervolt-
age. The thresholds are defined by VLKO and its hysteresis,
VLKH. When VIN rises above VLKO the chip is enabled; below
(VLKO – VLKH) it is disabled and GATE is pulled low. The
UVLO function at VIN should not be confused with the
UV/OV pin(s). These are completely separate functions.
UV/OV COMPARATORS (LTC4252)
An UV hysteretic comparator detects undervoltage condi-
tions at the UV pin, with the following thresholds:
UV low-to-high (VUVHI) = 3.225V
UV high-to-low (VUVLO) = 2.925V
An OV hysteretic comparator detects overvoltage condi-
tions at the OV pin, with the following thresholds:
OV low-to-high (VOVHI) = 6.150V
OV high-to-low (VOVLO) = 5.550V
The UV and OV trip point ratio is designed to match the
standard telecom operating range of 43V to 82V when con-
nected together as in the typical application. A divider (R1,
R2) is used to scale the supply voltage. Using R1 = 402k
425212 F03
–48RTN
UV
OV
VEE
VIN
SENSE
SS
TIMER
GATE
PWRGD
DRAIN
LTC4252-1
R1
432k
1%
R3
38.3k
1%
R2
4.75k
1%
CT
330nF
CSS
68nF
CC
18nF
–48V
RS
0.02Ω
Q1
IRF530S
RC
10Ω
R5
2.2k
Q2
RIN
10k
1/2W
1
9
8
10
3
2
7
6
4
5
C2
10nF
CIN
1μF
CL
100μF
–48RTN
(SHORT PIN)
+
RD 1M
LOAD
EN
R4
22k
*
* M0C207
Q2: MMBT5551LT1
**DIODES, INC
RECOMMENDED FOR HARSH ENVIRONMENTS
DIN
DDZ13B**
Figure 3. – 48V/2.5A Application with Different Input Operating Range
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4252-2CMSPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Negative Voltage Hot Swap Controllers |
| LTC4252-2CMSTR | 制造商:LINER 制造商全称:Linear Technology 功能描述:Negative Voltage Hot Swap Controllers |
| LTC4252-2CMSTRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Negative Voltage Hot Swap Controllers |
| LTC4252-2IMS | 功能描述:IC CNTRLR HOTSWAP NEGVOLT 10MSOP RoHS:否 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 |
| LTC4252-2IMS#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:- 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 |
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