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參數資料
| 型號： | LM9061M |
| 英文描述： | SINGLE MOSFET DRIVER|BIPOLAR|SOP|8PIN|PLASTIC |
| 中文描述： | 單MOSFET驅動器|雙極|?？苵 8引腳|塑料 |
| 文件頁數： | 10/15頁 |
| 文件大?。?/td> | 336K |
| 代理商： | LM9061M |
Application Hints
(Continued)
A bypass capacitor across R
is optional and is used to
help keep the reference voltage constant in applications
where the V
supply is subject to high levels of transient
noise. This bypass capacitor should be no longer than
0.1 μF, and is not needed for most applications.
DELAY TIMER
To allow the MOSFET to conduct currents beyond the pro-
tection threshold for a brief period of time, a delay timer
function is provided. This timer delays the actual latching
OFF of the MOSFET for a programmable interval. This fea-
ture is important to drive loads which require a surge of
current in excess of the normal ON current upon start up, or
at any point in time, such as lamps and motors. Figure 4
details the delay timer circuitry. A capacitor connected from
the Delay pin 8, to ground sets the delay time interval. With
the MOSFET turned ON and all conditions normal, the out-
put of the protection comparator is low and this keeps the
discharge transistor ON. This transistor keeps the delay
capacitor discharged. Should a surge of load current trip the
protection comparator high, the discharge transistor turns
OFF and an internal 10 μA current source begins linearly
charging the delay capacitor.
If the surge current, with excessive V
DS
voltage, lasts long
enough for the capacitor to charge to the timing comparator
threshold of typically 5.5V, the output of the comparator will
go high to set a flip-flop and immediately latch the MOSFET
OFF. It will not re-start until the ON/OFF Input is toggled low
then high.
The delay time interval is set by the selection of C
DELAY
and
can be found from:
where typically V
TIMER
= 5.5V and I
DELAY
= 10 μA.
Charging of the delay capacitor is clamped at approximately
7.5V which is the internal bias voltage for the 10 μA current
source.
MINIMUM DELAY TIME
A minimum delay time interval is required in all applications
due to the nature of the protection circuitry. At the instant the
MOSFET is commanded ON, the voltage across the
MOSFET, V
, is equal to the full load supply voltage be-
cause the source is held at ground by the load. This condi-
tion will immediately trip the protection comparator. Without
a minimum delay time set, the timing comparator will trip and
force the MOSFET to latch OFF thereby never allowing the
load to be energized.
To prevent this situation a delay capacitor is required at pin
8. The selection of a minimum capacitor value to ensure
proper start-up depends primarily on the load characteristics
and how much time is required for the MOSFET to raise the
load voltage to the point where the Sense input is more
positive than the Threshold input (T
START-UP
). Some experi-
mentation is required if a specific minimum delay time char-
acteristic is desired. Therefore:
In the absence of a specific delay time requirement, a value
for C
DELAY
of 0.1 μF is recommended.
OVER VOLTAGE PROTECTION
The LM9061 will remain operational with up to +26V on V
.
If V
increases to more than typically +30V the LM9061 will
turn off the MOSFET to protect the load from excessive
voltage. When V
has returned to the normal operating
range the device will return to normal operation without
requiring toggling the ON/OFF input. This feature will allow
MOSFET operation to continue in applications that are sub-
ject to periodic voltage transients, such as automotive appli-
cations.
For circuits where the load is sensitive to high voltages, the
circuit shown in Figure 5 can be used. The addition of zener
on the Sense input (pin 1) will provide a maximum voltage
01231712
FIGURE 4. Delay Timer
L
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LM9061M/NOPB | 功能描述:功率驅動器IC High-Side Pwr Mosfet Driver RoHS:否 制造商:Micrel 產品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| LM9061M/NOPB | 制造商:Texas Instruments 功能描述:IC, MOSFET DRIVER, SOIC-8 |
| LM9061MX | 功能描述:功率驅動器IC RoHS:否 制造商:Micrel 產品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| LM9061MX/NOPB | 功能描述:功率驅動器IC RoHS:否 制造商:Micrel 產品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| LM9061N | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Power MOSFET Driver with Lossless Protection |
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