参数资料
| 型号： | MAX4273EVKIT |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 22/26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
100
D = 0.50
10
0.20
0.10
0.05
1
0.02
0.01
SINGLE PULSE
P DM
t 1
t 2
(THERMAL RESPONSE)
NOTES:
1. DUTY FACTOR D = t 1 / t 2
2. PEAK T J = P DM X Z θ JA + T A
0.1
0.0001
0.001
0.01
0.1
1
10
100
t 1 , RECTANGULAR PULSE DURATION (s)
Figure 17. Example Curves (from IRF7413A) for Maximum Effective Transient Thermal Impedance, Junction to Ambient
For the MAX4273 in retry mode, the duty cycle can be
adjusted. Use the MOSFET Z θ JA curve and the t START
pulse duration to choose a maximum duty cycle, D.
Calculate the retry time:
t RETRY = t START / D
Use Figure 8 to determine CTIM given t RETRY .
The MOSFET pulsed drain current limit is 58A.
Another consideration for setting the current limit is
the system requirement. Systems may glitch if 58A
load transients are present. For this example, the
load transient will be limited to 10A:
System current limit = 10A
GIVEN:
Design Procedure (MAX4273)
Current-sense resistor = 10m Ω
Fast comparator threshold = 10m Ω ? 10A = 100mV
? Hot-swap 5V supply to a 1000μF card
? MOSFET IRF7413A: R DS(on) = 0.0135 Ω
? Operating current = 4A
? Overload current = 5A
? System current limit = 10A
? Retry enabled
PROCEDURE:
1) Select the current sense resistor:
Slow comparator threshold = 50mV
Overload current = 5A
Current-sense resistor value = 50mV/5A = 10m Ω
The device will initiate a slow fault if the load current
is greater than 5A for longer than 20μs after startup.
2) Set fast comparator threshold (RTH).
Select RTH from Figure 7, RTH = 10k Ω
3) Set Startup timer.
Startup current = System current limit = 10A
V IN = 5V
C BOARD = 1000μF
t ON = 1000μF ? 5V / 10A = 500μs
Give a factor of 2 guardband on the startup timer.
t START = 2 ? t ON = 1.0ms
From Figure 8, C TON = 3000pF.
4) Select Retry Timeout.
V IN = 5V.
I MAX = 10A.
Peak junction temperature, T J = 150°C J
Peak ambient temperature, T A = 85°C A
22
______________________________________________________________________________________
相关PDF资料 |
PDF描述 |
|---|---|
| MAX4278EVKIT-SO | KIT EVALUATION FOR MAX4178,4278 |
| MAX44265EVKIT# | KIT EVAL FOR 44265 |
| MAX4754AEVKIT+ | KIT EVAL FOR MAX4754 |
| MAX4810EVKIT+ | KIT EVAL FOR MAX4810 |
| MAX4886EVKIT+ | KIT EVAL FOR MAX4886 |
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 |
发布紧急采购，3分钟左右您将得到回复。