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參數(shù)資料
| 型號： | LM9061N |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | MOSFETs |
| 英文描述： | Power MOSFET Driver with Lossless Protection |
| 中文描述： | BUF OR INV BASED MOSFET DRIVER, PDIP8 |
| 封裝： | DIP-8 |
| 文件頁數(shù)： | 10/14頁 |
| 文件大?。?/td> | 234K |
| 代理商： | LM9061N |
Application Hints
(Continued)
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:
C
DELAY
e
(I
DELAY
c
T
START-UP
)
V
TIMER
In the absence of a specific delay time requirement, a value
for C
DELAY
of 0.1
m
F is recommended.
OVER VOLTAGE PROTECTION
The LM9061 will remain operational with up to
a
26V on
V
CC
. If V
CC
increases to more than typically
a
30V the
LM9061 will turn off the MOSFET to protect the load from
excessive voltage. When V
CC
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 subject to periodic voltage transients, such as automo-
tive applications.
For circuits where the load is sensitive to high voltages, the
circuit shown in Figure 5 can be used. The addition of a
zener on the Sense input (pin 1) will provide a maximum
voltage reference for the Protection Comparator. The Sense
resistor is required in this application to limit the zener cur-
rent. When the device is ON, and the load supply attempts
to rise higher than (V
ZENER
a
V
THRESHOLD
), the Protection
comparator will trip, and the Delay Timer will start. If the high
supply voltage condition lasts long enough for the Delay
Timer to time out, the MOSFET will be latched off. The ON/
OFF input will need to be toggled to restart the MOSFET.
TL/H/12317–13
FIGURE 5. Adding Over-Voltage Protection
REVERSE BATTERY
The LM9061 is not protected against reverse polarity supply
connections. If the V
CC
supply should be taken negative
with respect to ground, the current from the V
CC
pin should
be limited to 20 mA. The addition of a diode in series with
the V
CC
input is recommended. This diode drop does not
subtract significantly from the charge pump gate overdrive
output voltage.
LOW BATTERY
As an additional protection feature the LM9061 incorporates
an Undervoltage Shut-OFF function. If the V
CC
supply to the
package drops below 7V, where it may not be assured that
the MOSFET is actually ON when it should be, circuitry will
automatically turn OFF the power MOSFET.
Figure 6 shows the LM9061 used as an electronic circuit
breaker. This circuit provides low voltage shutdown, over-
voltage latch OFF, and overcurrent latch OFF. In the event
of a latch OFF shutdown, the circuit can be reset by shutting
the main supply off, then back on. An optional reset switch
on the ON/OFF pin will allow a ‘‘push-button reset’’ of the
circuit after latching OFF.
TL/H/12317–14
FIGURE 6. Electronic Circuit Breaker
Scaling of the external resistor value, from V
CC
to the ON/
OFF input pin, with the internal 30k resistor can be used to
increase the startup voltage. The circuit operation then be-
comes dependent on the resistor ratio and V
CC
providing an
ON/OFF pin voltage being above the ON threshold rather
than the LM9061 low V
CC
shutdown feature.
DRIVING MOSFET ARRAYS
The LM9061 is an ideal driver for any application that re-
quires multiple parallel MOSFETs to provide the necessary
load current. Only a few ‘‘common sense’’ precautions need
to be observed. All MOSFETs in the array must have identi-
cal electrical and thermal characteristics. This can be
solved by using the same part number from the same
10
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