参数资料
| 型号： | MAX4273EVKIT |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 21/26页 |
| 文件大小： | 0K |
| 描述： | EVAL KIT FOR MAX4273 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 主要目的： | 电源管理，热交换控制器 |
| 已用 IC / 零件： | MAX4273 |
| 已供物品： | 板 |
3V to 12V Current-Limiting Hot-Swap Controllers
with Autoretry, DualSpeed/BiLevel Fault Protection
V IN
100k
IN
SENSE
GATE
?
?
?
?
ON
LLMON
?
?
INC
μ P
MAX4273
OUTC
Figure 15. Adjustable Undervoltage Lockout and Output Voltage Reset Generator
RESET
is discharged immediately, but note that the MOSFET is
not completely off until V GS < V TH . If the main system
power supply collapses below UVLO, the MAX4271/
MAX4272/MAX4273 will force the device to restart in
V IN
BACKPLANE
REMOVABLE CARD
WITH NO HOT-INSERTION
PROTECTION
V OUT
startup mode with a 150ms delay once the supply has
recovered. The main system power supply must be
able to deliver this fault current without excessive volt-
IN
SENSE
GATE
C BOARD
age drop.
The MOSFET is turned off in a very short time; there-
fore, the resulting dv/dt can be considerable. The back-
plane delivering the power to the external card must
CTIM
MAX4271
MAX4272
MAX4273
ON
have a fairly low inductance to limit the voltage tran-
sients caused by the removal of a fault. Bypassing the
input with a small capacitor alleviates false UVLO trips
due to these transients.
MOSFET Thermal Considerations
During normal operation, the MOSFET dissipates little
power, it is fully turned on, and its R DS(ON) is minimal.
The power dissipated in normal operation is P D =
I LOAD 2 x R DS(ON) . A considerable amount of power is
dissipated during the startup and turn-off transients.
The design must take into consideration the worst-case
scenario of a continuous short-circuit fault present on
the board. Two cases need to be considered:
1) The single turn-on with the device latched after a
fault (when using MAX4271 or MAX4273 in latched
mode)
2) The continuous automatic retry (when using the
MAX4272 or MAX4273 in retry mode)
Use the following equation to calculate the maximum
transient thermal resistance (in °C/W) required for an
output short to ground:
Z θ JA (max) = (T JMAX - T A ) / (V IN ? I FAST, SET )
Figure 16. Using the MAX4271/MAX4272/MAX4273 on a
Backplane
MOSFET manufacturers typically include curves for the
transient thermal resistance, Z θ JA , of the package
(Figure 17). Find the thermal impedance of the MOS-
FET by using t START as the pulse duration and by
choosing the single pulse curve for latched mode parts
or by choosing the duty cycle = 0.03 curve for the
MAX4272 (the duty cycle is fixed at 32:1). If the Z θ JA
required is less than that of the package, reduce
t START , reduce I FAST,SET , use a heatsink on the MOS-
FET, or choose one with better thermal characteristics.
______________________________________________________________________________________
21
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX4274ABESA | 功能描述:运算放大器 - 运放 Integrated Circuits (ICs) RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
| MAX4274ABESA+T | 功能描述:运算放大器 - 运放 RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
| MAX4274ABESA-T | 功能描述:运算放大器 - 运放 RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
| MAX4274ABEUA | 功能描述:运算放大器 - 运放 Integrated Circuits (ICs) RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
| MAX4274ABEUA-T | 功能描述:运算放大器 - 运放 RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
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