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參數(shù)資料
| 型號： | ADM1041A |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Secondary-Side Controller with Current Share and Housekeeping |
| 中文描述： | 二次側(cè)電流控制器共享和管家 |
| 文件頁數(shù)： | 25/56頁 |
| 文件大?。?/td> | 991K |
| 代理商： | ADM1041A |
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ADM1041A
OrFET GATE DRIVE
When configured, this block provides a signal to turn on/off
an OrFET used in the output of paralleled power supplies. The
gate drive voltage of one of these FETs is typically 6 V to 10 V
above the output voltage. Because the output voltage of the
ADM1041A is limited, an external transistor needs to be used.
The block diagram shows an example of this approach.
See Figure 21.
Rev. 0 | Page 25 of 56
The F
G
output is an open-drain, N-channel MOSFET and is
normally high, which holds the OrFET off. When all the start-
up conditions are correct, Pin 19 is pulled low, which allows the
OrFET to turn on. The logic can also be configured as inverted
if a noninverting drive circuit is used.
A differential amplifier monitors the voltage across the OrFET
and has two major functions. First, during start-up, it allows the
OrFET to turn on with almost 0 V across it to avoid voltage
glitches on the bus. This applies to a hot bus or a cold bus. The
internal threshold can be configured from 20 mV to 50 mV
(negative), which is scaled up by the external voltage dividers.
Second, if a rectifier or filter capacitor fails during steady state
operation, it detects the resulting reverse voltage across the
OrFET’s on-resistance and turns off the OrFET before a voltage
dip appears on the bus. The internal threshold can be
configured from 100 mV to 250 mV (negative), which is also
scaled up by the external voltage dividers. A slightly larger filter
capacitor may be used on the voltage divider at Pin 6 to speed
up this function.
Figure 17 shows the typical response time of the ADM1041A to
such an event. In the plot, V
FD
is ramped down and the response
time of the F
G
pin to a reverse voltage event on the F
D
pin is
seen. This simulates the rectifier or filter capacitor failure
during steady-state operation. When the F
D
voltage is below
1.9 V (2 V minus 100 mV threshold), the F
G
pin reacts. As can
be seen, the response time is approx 330 nsecs. This extremely
fast turn-off is vital in an n+1 power supply system
configuration. It ensures that the damaged power supply
removes itself from the system quickly. Figure 18 shows the
equivalent response time to turn on the OrFET. As can be seen,
there is a delay of approximately 500 ns before the FG pin
ramps down to turn on the OrFET, allowing the power supply
to contribute to the system. This propagation delay is due
mainly to internal amplifier response limitations. The circuit in
Figure 21 is used to generate these plots. In this case, the
resistor to V
DD
from the FG pin is 2 kΩ.
Figure 19 and Figure 20 show the OrFET turn-off time and
turn-on time when the F
G
pin polarity is inverted. As can be
seen, to turn off the OrFET, the V
FG
pin now transitions from
high to low. Also, its corresponding turn-on event occurs from
a low-to-high transition. The circuit in Figure 21 is used to
generate these plots.
0
64%
T
TOTAL
= 330ns
T
DELAY
= 218ns T = 112ns
Figure 17. OrFET Turn-Off Time (Default Polarity)
T
TOTAL
= 506ns
0
Figure 18. OrFET Turn-On Time (Default Polarity)
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相關(guān)代理商/技術(shù)參數(shù) |
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| ADM1041AARQZ | 功能描述:IC SECONDARY SIDE CTRLR 24QSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電源控制器，監(jiān)視器 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 應(yīng)用:多相控制器 輸入電壓:- 電源電壓:9 V ~ 14 V 電流 - 電源:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:40-TQFN-EP（5x5） 包裝:帶卷 (TR) |
| ADM1041AARQZ-REEL | 功能描述:IC SECONDARY SIDE CTRLR 24QSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電源控制器，監(jiān)視器 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 應(yīng)用:多相控制器 輸入電壓:- 電源電壓:9 V ~ 14 V 電流 - 電源:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:40-TQFN-EP（5x5） 包裝:帶卷 (TR) |
| ADM1041AARQZ-REEL7 | 功能描述:IC SECONDARY SIDE CTRLR 24QSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電源控制器，監(jiān)視器 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 應(yīng)用:多相控制器 輸入電壓:- 電源電壓:9 V ~ 14 V 電流 - 電源:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:40-TQFN-EP（5x5） 包裝:帶卷 (TR) |
| ADM1041A-EVALZ | 功能描述:BOARD EVAL FOR ADM1041A RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - DC/DC 與 AC/DC（離線）SMPS 系列:- 標準包裝:1 系列:- 主要目的:DC/DC，步降 輸出及類型:1，非隔離 功率 - 輸出:- 輸出電壓:3.3V 電流 - 輸出:3A 輸入電壓:4.5 V ~ 28 V 穩(wěn)壓器拓撲結(jié)構(gòu):降壓 頻率 - 開關(guān):250kHz 板類型:完全填充 已供物品:板 已用 IC / 零件:L7981 其它名稱:497-12113STEVAL-ISA094V1-ND |
| ADM1041ARQ | 功能描述:IC PWR SUPP MON/LOAD SHAR 24QSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 電源控制器，監(jiān)視器 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 應(yīng)用:多相控制器 輸入電壓:- 電源電壓:9 V ~ 14 V 電流 - 電源:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:40-TQFN-EP（5x5） 包裝:帶卷 (TR) |
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