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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)： | 18/24頁 |
| 文件大?。?/td> | 407K |
| 代理商： | MAX4271-MAX4273 |
M
3V to 12V Current-Limiting Hot Swap Controllers
with Autoretry, DualSpeed/BiLevel Fault Protection
18
______________________________________________________________________________________
Case B. Startup With Current Regulation
In applications where the board capacitance (C
BOARD
)
at V
OUT
is high, the inrush current causes a voltage
drop across R
SENSE
that exceeds the fast comparator
threshold (V
FC,TH
). In this case, the current charging
C
BOARD
can be considered constant and the turn-on
time is determined by:
t
ON
= C
BOARD
V
IN
/ I
FAST,SET
where the maximum load current I
FAST,SET
= V
FC,TH
/
R
SENSE
. Figure 3 shows the waveforms and timing dia-
grams for a startup transient with current regulation. (See
Startup Time (C
BOARD
= 470μF) in the
Typical Operating
Characteristics.
) When operating under this condition, an
external gate capacitor is not required. Adding an exter-
nal gate capacitor at GATE to GND reduces the regulat-
ed current ripple but increases t
OFF
by increasing the
gate delay (t
d
) (Figure 4).
The actual startup time is determined by the longer of
the two timings of Case A and Case B. Set the startup
timer t
START
at 2
t
ON
to guarantee enough time for
the output voltage to settle; also take into consideration
device parameter variation.
Retry
The retry timer defines the dead time before the IC tries
to restart a startup sequence following a fault detection.
This feature is available on the MAX4272/MAX4273.
Before selecting the retry timer value, determine how
long a temporary high-current fault condition may be
present. In the event of a permanent fault, the automat-
ic retry will effectively force current pulses through the
Figure 8. Startup and Retry Timeout
t
ON
AND t
RETRY
vs.
CTON AND CTIM
CAPACITANCE (nF)
t
O
R
10,000
0.1
0.01
1
10
100
1000
0.01
10
100
0.1
1
1000
t
RETRY
vs. CTIM (MAX4272/MAX4273)
t
ON
vs. CTIM (MAX4271/MAX4272)
t
ON
vs. CTON (MAX4273)
Figure 9. Operation with an External Capacitor
M1
C
SPD
*
OPTIONAL (SEE TEXT)
C
TIM
CTIM
GATE
SENSE
GND
CSPD
ON
R
SENSE
V
OUT
C
GATE
C
BOARD
V
IN
IN
R
S
*
MAX4271
MAX4272
MAX4273
R
PULLUP
STAT
Table 6. “No-Overcurrent” Turn-On Timing (Startup Without Current Limit)
MOSFET t
ON
(ms)
V
IN
= 5V
0.16
2
0.130
1.8
0.074
1.8
MOSFET t
OFF
(ms)
V
IN
= 5V
0.13
1.1
0.13
1.1
0.067
1.0
DEVICE
C
GATE
(nF)
V
IN
= 3V
0.22
2.3
0.175
1.9
0.101
2.0
V
IN
= 12V
0.19
3.2
0.16
3.5
0.073
3.2
V
IN
= 3V
0.07
0.54
0.075
0.54
0.033
0.470
V
IN
= 12V
0.145
1.95
0.16
2.0
0.085
1.95
0
22
0
22
0
22
Fairchild FDS6670A
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IRF7401
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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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