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參數(shù)資料
| 型號(hào)： | MAX4271-MAX4273 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | 3V to 12V Current-Limiting Hot Swap Controllers with Autoretry, DualSpeed/BiLevel Fault Protection |
| 中文描述： | 3V至12V的電流限制與自動(dòng)重試，DualSpeed熱插拔控制器/雙層故障保護(hù) |
| 文件頁數(shù)： | 22/24頁 |
| 文件大小： | 407K |
| 代理商： | MAX4271-MAX4273 |
M
3V to 12V Current-Limiting Hot Swap Controllers
with Autoretry, DualSpeed/BiLevel Fault Protection
22
______________________________________________________________________________________
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
.
Design Procedure (MAX4273)
GIVEN:
Hot-swap 5V supply to a 1000μF card
MOSFET IRF7413A: R
DS(on)
= 0.0135
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
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).
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
Current-sense resistor = 10m
Fast comparator threshold = 10m
10A = 100mV
Select RTH from Figure 7, RTH = 10k
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
100
10
1
0.1
0.01
0.001
0.0001
0.1
1
10
100
T
θ
J
)
t
1
, RECTANGULAR PULSE DURATION (s)
P
DM
t
1
t
2
NOTES:
1. DUTY FACTOR D = t
1
/ t
2
2. PEAK T
J
= P
DM
X Z
θ
JA
+ T
A
D = 0.50
0.20
0.10
0.05
0.02
0.01
SINGLE PULSE
(THERMAL RESPONSE)
Figure 17. Example Curves (from IRF7413A) for Maximum Effective Transient Thermal Impedance, Junction to Ambient
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| MAX4272ESA | 功能描述:熱插拔功率分布 RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MAX4272ESA+ | 功能描述:熱插拔功率分布 3-12V Current-Limit Hot Swap Controller RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MAX4272ESA+T | 功能描述:熱插拔功率分布 3-12V Current-Limit Hot Swap Controller RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MAX4272ESA-T | 功能描述:熱插拔功率分布 RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MAX4273EEE | 功能描述:熱插拔功率分布 RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
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