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| 型号： | MAX4271ESA+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 22/26页 |
| 文件大小： | 0K |
| 描述： | IC CNTRLR HOT SWAP 8-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 热交换控制器 |
| 应用： | 通用 |
| 内部开关： | 无 |
| 电源电压： | 2.7 V ~ 13.2 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 带卷 (TR) |
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
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX4271ESA-TG05 | 功能描述:热插拔功率分布 RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| MAX4272ESA | 功能描述:热插拔功率分布 RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| MAX4272ESA+ | 功能描述:热插拔功率分布 3-12V Current-Limit Hot Swap Controller RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| MAX4272ESA+T | 功能描述:热插拔功率分布 3-12V Current-Limit Hot Swap Controller RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| MAX4272ESA-T | 功能描述:热插拔功率分布 RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
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