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參數(shù)資料
| 型號(hào)： | MAX4370 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Current-Regulating Hot-Swap Controller with DualSpeed/BiLevel Fault Protection |
| 中文描述： | 電流調(diào)節(jié)熱插拔控制器，帶有DualSpeed/BiLevel故障保護(hù) |
| 文件頁(yè)數(shù)： | 12/16頁(yè) |
| 文件大?。?/td> | 226K |
| 代理商： | MAX4370 |
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M
Current-Regulating Hot-S wap Controller with
DualS peed/BiLevel Fault Protec tion
12
______________________________________________________________________________________
Case A: Slow Turn-On (without overcurrent)
There are two ways to turn on the MOSFET without
reaching the fast comparator current limit:
1) If the board capacitance (C
BOARD
) is low, the
inrush current is low.
2) If the capacitance at GATE is high, the MOSFET
turns on slowly.
In both cases, the turn-on (t
ON
) is determined only by
the charge required to enhance the MOSFET—effec-
tively, the small gate-charging current limits the output
voltage dv/dt. This time can be extended by connect-
ing an external capacitor between GATE and GND, as
shown in Figure 7. The turn-on time is dominated by the
external gate capacitance if its value is considerably
higher than MOSFET gate capacitance. Table 4 shows
the timing required to enhance the recommended
MOSFET with or without an external capacitor at GATE;
Figures 2 and 3 show the related waveforms and timing
diagrams (see Start-Up Time with C
BOARD
= 0 and
Start-Up Time with External C
GATE
in the Typical
Operating Characteristics). Remember that a high gate
capacitance also increases the turn-off time.
When using the MAX4370 without an external gate
capacitor, R
S
is not necessary. R
S
prevents MOSFET
source oscillations that can occur when C
GATE
is high
while C
BOARD
is low.
Case B: Fast Turn-On (with current limit)
In applications where the board capacitor (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
= 200mV). 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 2 shows the waveforms and timing dia-
grams for a turn-on transient with current regulation (see
Start-Up Time with C
BOARD
= 470μF in the Typical
Operating Characteristics). When operating under this
condition, an external gate capacitor is not required.
Adding an external capacitor at GATE reduces the regu-
lated current ripple but increases the turn-off time by
increasing the gate delay (t
d
) (Figure 3).
M1
C
SPD
*
OPTIONAL (SEE TEXT)
C
TIM
CTIM
GATE
VSEN
GND
CSPD
ON
R
SENSE
V
OUT
C
GATE
C
BOARD
V
IN
V
IN
R
S
*
MAX4370
R
PULL-UP
STAT
Figure 7. Operation with External Gate Capacitor
Table 4. MOSFET Turn-On Time (start-up without current limit)
(C
BOARD
= 0, turn-on with no load current, turn-off with 2A fault current)
International Rectifier
IRF7401
Fairchild FDS6670A
0
22
0
22
0
175μs
1.9ms
101μs
2ms
220μs
2.3ms
130μs
1.8ms
74μs
1.8ms
160μs
2ms
160μs
3.5ms
73μs
3.2ms
MOSFET TURN-ON (t
ON
)
V
IN
= 3V
V
IN
= 5V
190μs
3.2ms
75μs
540μs
33μs
470μs
70μs
540μs
130μs
1.1ms
67μs
1ms
130μs
1.1ms
160μs
2ms
85μs
1.95ms
MOSFET TURN-OFF (t
OFF
)
V
IN
= 3V
V
IN
= 5V
145μs
1.95ms
22
Motorola
MMSF5N03HD
C
GATE
(nF)
V
IN
= 12V
V
IN
= 12V
DEVICE
Electrical characteristics as specified by the manufacturer’s data sheet:
FDS6670A: C
ISS
= 3200pF, Q
T(MAX)
= 50nC, R
DS(ON)
= 8.2m
IRF7401: C
ISS
= 1600pF, Q
T(MAX)
= 48nC, R
DS(ON)
= 22m
MMSF5N03HD: C
ISS
= 1200pF, Q
T(MAX)
= 21nC, R
DS(ON)
= 40m
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX4370ESA | 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 |
| MAX4370ESA+ | 功能描述:熱插拔功率分布 Current-Regulating 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 |
| MAX4370ESA+T | 功能描述:熱插拔功率分布 Current-Regulating 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 |
| MAX4370ESA-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 |
| MAX4372FEBT | 制造商:Maxim Integrated Products 功能描述:UCSP/SOT23, MICROPOWER, HIGH-SIDE CURRENT-SENSE AMP - Rail/Tube |
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