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参数资料
| 型号： | LTC4252A-1CMS#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： | 6/36页 |
| 文件大小： | 394K |
| 代理商： | LTC4252A-1CMS#TRPBF |
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LTC4252-1/LTC4252-2
LTC4252A-1/LTC4252A-2
14
425212fb
APPLICATIO S I FOR ATIO
WU
U
SHUNT REGULATOR
A fast responding regulator shunts the LTC4252 VIN pin.
Power is derived from – 48RTN by an external current
limiting resistor. The shunt regulator clamps VIN to 13V
(VZ). A 1F decoupling capacitor at VIN filters supply
transients and contributes a short delay at start-up. RIN
should be chosen to accommodate both VIN supply cur-
rent and the drive required for an optocoupler if the
PWRGD function on the 10-pin MS package is used.
Higher current through RIN results in higher dissipation
for RIN and the LTC4252. An alternative is a separate NPN
buffer driving the optocoupler as shown in Figure 3.
Multiple 1/4W resistors can replace a single higher power
RIN resistor.
INTERNAL UNDERVOLTAGE LOCKOUT (UVLO)
A hysteretic comparator, UVLO, monitors VIN for
undervoltage. 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
connected together as in the typical application. A divider
(R1, R2) is used to scale the supply voltage. Using R1 =
402k and R2 = 32.4k gives a typical operating range of
43.2V to 82.5V. The undervoltage shutdown and overvolt-
age recovery thresholds are then 39.2V and 74.4V. 1%
divider resistors are recommended to preserve threshold
accuracy.
The R1-R2 divider values shown in the Typical Application
set a standing current of slightly more than 100
A and
define an impedance at UV/OV of 30k
. In most applica-
4252-1/2 F03
GND
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
0.02
Q1
IRF530S
RC
10
R5
2.2k
Q2
RIN
10k
1/2W
1
9
8
10
3
2
7
6
4
5
C2
10nF
CIN
1
F
CL
100
F
GND
(SHORT PIN)
+
RD 1M
LOAD
EN
R4
22k
*
* M0C207
Q2: MMBT5551LT1
Figure 3. – 48V/2.5A Application with Different Input Operating Range
相关PDF资料 |
PDF描述 |
|---|---|
| LTC4252A-1IMS#PBF | Negative Voltage Hot Swap Controllers; Package: MSOP; No of Pins: 10; Temperature Range: -40°C to +85°C |
| LTC4252A-1IMS#TRPBF | Negative Voltage Hot Swap Controllers; Package: MSOP; No of Pins: 10; Temperature Range: -40°C to +85°C |
| LTC4252A-2CMS#PBF | Negative Voltage Hot Swap Controllers; Package: MSOP; No of Pins: 10; Temperature Range: 0°C to +70°C |
| LTC4252A-2CMS#TRPBF | Negative Voltage Hot Swap Controllers; Package: MSOP; No of Pins: 10; Temperature Range: 0°C to +70°C |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4252A-1IMS | 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-1IMS#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-1IMS#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-1IMS#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-1IMSPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Negative Voltage Hot Swap Controllers |
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