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參數(shù)資料
| 型號： | ADM1170-1AUJZ-RL7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 電源管理 |
| 英文描述： | 1.6 V to 16.5 V Hot Swap Controller with Soft Start |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | LEAD FREE, MO-193BA, TSOT-8 |
| 文件頁數(shù)： | 13/16頁 |
| 文件大小： | 168K |
| 代理商： | ADM1170-1AUJZ-RL7 |
ADM1170
threshold. The device can be reset by toggling the ON-CLR pin
or by manually pulling the TIMER pin low. On the ADM1170-1,
the TIMER pin activates the 2 μA pull-down once the 1.3 V
threshold is reached, and continues to pull down until it reaches
the 0.2 V threshold. At this point, the 100 μA pull-down is
activated and the GATE pin is enabled. The device keeps
retrying in the manner as shown in Figure 35.
Rev. 0 | Page 13 of 16
The ADM1170-2 model has a latch off system whereby when a
current fault is detected, the GATE is switched off after a time
determined by the timer capacitor (see Figure 36 for details).
Toggling the ON-CLR pin, or pulling the TIMER pin to GND
for a brief period, resets this condition.
5μA
COMP1
COMP2
SHORT-
CIRCUIT
EVENT
60μA
V
TIMER
V
OUT
V
GSFET
I
RSENSE
0
The duty cycle of this automatic retry cycle is set to the ratio of
2 μA/60 μA, which approximates 3.8% on. The value of the
timer capacitor determines the on time of this cycle. This time
is calculated as follows:
t
ON
= 1.3 ×
C
TIMER
/60 μA
t
OFF
= 1.1 ×
C
TIMER
/2 μA
2μA
COMP1
COMP2
SHORT-
CIRCUIT
EVENT
60μA
100μA
V
TIMER
V
OUT
V
GSFET
I
RSENSE
FAULT
CYCLE
FAULT
CYCLE
0
Figure 36. ADM1170-2 Latch Off After Overcurrent Fault
SOFT START
The inrush current profile is controlled using an external
capacitor on the soft start (SS) pin. During power on reset, the
SS pin is held at GND. When the pass FET begins to conduct
current, a pull-up current source is initiated on the SS pin and
charges the voltage on the soft start capacitor in a linear fashion.
The current limit of the device is porportional to the voltage on
the SS pin until it reaches 1 V. When the voltage on the SS pin
reaches 1 V the current limit reaches the normal operating
condition of V
SENSE
= 50 mV. The voltage on the SS pin
continues to rise past the 1 V level with no effect on the current
limit. The reference voltage for the GATE linear control
amplifier is derived from the soft start voltage, such that the
inrush linear current limit is defined as
I
LIMIT
=
V
SS
/(20 ×
R
SENSE
)
Figure 35. ADM1170-1 Automatic Retry During Overcurrent Fault
AUTOMATIC RETRY OR LATCHED OFF
The ADM1170 is available in two models. The ADM1170-1
has an automatic retry system whereby when a current fault is
detected, the FET is shut down after a time determined by the
timer capacitor, and it is switched on again in a controlled con-
tinuous cycle to determine if the fault remains (see Figure 35
for details). The period of this cycle is determined by the timer
capacitor at a duty cycle of 3.8% on and 96.2% off.
This provides a limit of 50 mV across R
SENSE
when V
SS
is at 1 V.
Therefore, the value for the SS capacitor is chosen as follows:
C
SS
=
I
SS
×
t
where
I
SS
= 10 μA and
t
is the time required for the current limit
to ramp up.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADM1170-2AUJZ-RL7 | 功能描述:IC CTRLR HOTSWAP 16.5V TSOT-23-8 RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:119 系列:- 類型:熱交換控制器 應(yīng)用:通用型，PCI Express? 內(nèi)部開關(guān):無 電流限制:- 電源電壓:3.3V，12V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:80-TQFP 供應(yīng)商設(shè)備封裝:80-TQFP（12x12） 包裝:托盤 產(chǎn)品目錄頁面:1423 (CN2011-ZH PDF) |
| ADM1171 | 制造商:AD 制造商全稱:Analog Devices 功能描述:2.7 V to 16.5 V Hot Swap Controller with Current Sense Output |
| ADM1171-1AUJ | 制造商:Analog Devices 功能描述:ADI HOT SWAP CONTROLLER - Bulk |
| ADM1171-1AUJZ-RL7 | 功能描述:IC CTRLR HOTSWAP 16.5V TSOT-23-8 RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:119 系列:- 類型:熱交換控制器 應(yīng)用:通用型，PCI Express? 內(nèi)部開關(guān):無 電流限制:- 電源電壓:3.3V，12V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:80-TQFP 供應(yīng)商設(shè)備封裝:80-TQFP（12x12） 包裝:托盤 產(chǎn)品目錄頁面:1423 (CN2011-ZH PDF) |
| ADM1171-2AUJ | 制造商:Analog Devices 功能描述:ADI HOT SWAP CONTROLLER - Bulk |
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