- 您現(xiàn)在的位置：買(mǎi)賣(mài)IC網(wǎng) > PDF目錄384671 > MAX4370 (Maxim Integrated Products, Inc.) Current-Regulating Hot-Swap Controller with DualSpeed/BiLevel Fault Protection PDF資料下載
參數(shù)資料
| 型號(hào)： | MAX4370 |
| 廠(chǎng)商： | Maxim Integrated Products, Inc. |
| 元件分類(lèi)： | 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)： | 9/16頁(yè) |
| 文件大小： | 226K |
| 代理商： | MAX4370 |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)當(dāng)前第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)
M
Current-Regulating Hot-S wap Controller with
DualS peed/BiLevel Fault Protec tion
_______________________________________________________________________________________
9
S low Comparator
The slow comparator is disabled at start-up while the
external MOSFET is turning on. This allows the part to
ignore the higher-than-normal inrush current charging
the board capacitors (C
BOARD
) when a card is first
plugged in.
If the slow comparator detects an overload current
while in normal operation (after start-up is completed),
it turns off the external MOSFET by discharging the
gate capacitance with a 200μA current. The slow com-
parator threshold is set at 50mV and has a default
delay of 20μs (CSPD floating), allowing it to ignore
power-supply glitches and noise. The response time
can be lengthened with an external capacitor at CSPD
(Figure 8).
If the overcurrent condition is not continuous, the dura-
tion above the threshold minus the duration below it
must be greater than 20μs (or the external programmed
value) for the device to trip. When the current is above
the threshold, CSPD is charged with a 6μA current
source; when the current is below the threshold, CSPD
is discharged with a 6μA current source. A fault is
detected when CSPD is charged to the trip point of
1.2V. A pulsing current with a duty cycle greater than
50% (i.e., > 50% of the time the current is above the
threshold level) will be considered a fault condition
even if it is never higher than the threshold for more
than the slow comparator’s set response time.
Once the fault condition is detected, the STAT pin goes
low and the device goes into latched mode. The GATE
voltage discharge rate depends on the gate capaci-
tance and the external capacitance at GATE.
Fast Comparator
The fast comparator behaves differently according to
the operating mode. During start-up, the fast compara-
tor is part of a simple current regulator. When the
sensed current is above the threshold (V
FC,TH
=
200mV), the gate is discharged with a 80μA current
source. When the sensed current drops below the
threshold, the charge pump turns on again. The sensed
current will rise and fall near the threshold due to the
fast comparator and charge-pump propagation delay.
The gate voltage will be roughly saw-tooth shaped, and
the load current will present a 20% ripple. The ripple
can be reduced by adding a capacitor from GATE to
GND. Once C
BOARD
is completely charged, the load
current drops to its normal operating levels. If the
sensed current is still high after the start-up timer
expires, the MOSFET gate is discharged completely.
In normal operation (after start-up), the fast comparator
is used as an emergency off switch. If the load current
reaches the fast comparator threshold, the device
immediately forces the MOSFET off completely by dis-
charging the GATE with a 200μA current. This can
occur in the event of a serious current overload or a
dead short. Given a 1000pF gate capacitance and 12V
gate voltage, the MOSFET will be off in less than 60μs.
Any additional capacitance connected between GATE
and GND to slow down the turn-on time also increases
the turn-off time.
Latc hed Mode and Reset
The MOSFET driver of the MAX4370 stays latched off
after a fault condition until it is reset by a negative-
going pulse on the ON pin. Pulse ON low for 20μs
(min), then high to restart after a fault. During start-up, a
negative-going edge on ON will force the device to turn
off the MOSFET and place the device in latched mode.
Keep ON low for 20μs (min) to restart.
t
OFF
V
GATE
STAT
~V
TH
~
V
IN
V
OUT
I
LOAD
I
LIM
t
d
Figure 3. Response to a Fault Condition
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX4373 | Low-Cost, Micropower, High-Side Current-Sense Amplifier Comparator Reference ICs |
| MAX4375 | Low-Cost, Micropower, High-Side Current-Sense Amplifier Comparator Reference ICs |
| MAX4373FESA | Low-Cost, Micropower, High-Side Current-Sense Amplifier Comparator Reference ICs |
| MAX4373FEUA | Low-Cost, Micropower, High-Side Current-Sense Amplifier Comparator Reference ICs |
| MAX4374HEUB | Low-Cost, Micropower, High-Side Current-Sense Amplifier Comparator Reference ICs |
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 |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。