參數(shù)資料
型號: MC3392
廠商: Motorola, Inc.
英文描述: LOW SIDE PROTECTED SWITCH
中文描述: 低邊保護(hù)開關(guān)
文件頁數(shù): 6/12頁
文件大?。?/td> 198K
代理商: MC3392
MC3392
6
MOTOROLA ANALOG IC DEVICE DATA
Figure 11. Turn–On Waveform
Figure 12. Turn–Off Waveform
Figure 13. Output Current versus
Supply Voltage
Figure 14. Maximum Load Inductance
versus Output Current
I
0
10
20
30
40
50
60
+VS, SUPPLY VOLTAGE (V)
L
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
IO, OUTPUT CURRENT (A)
760 mA
14 V
4.0 V
1.0 V
IO
Vout
IO
Vout
Vin
1.5
1.25
1.0
0.75
0.5
0.25
0
0.5
0.4
0.3
0.2
0.1
0
Vin = 4.0 V
RL = 0
TA = 25
°
C
No Heatsink
Infinite Heatsink
Safe Operating Region
External Clamp Needed
Emax = 60 mJ
+VS = 14 V
RL = 17
TA = 25
°
C
+VS = 14 V
RL = 17
TA = 25
°
C
TECHNICAL DISCUSSION
Introduction
The MC3392 is a low side protected switch incorporating
many features making it ideal for use in harsh automotive
applications. The protection circuitry of the MC3392 protects
not only itself but also the associated load from destructive
voltage transients attributed to load and field dump, as well as
reverse and double battery conditions found in automotive
applications. The MC3392 is unique in that the protection
circuitry is internal and does not require additional external
protection components for its operation. This makes the
device very cost effective because its application utilizes few
external components, thus reducing cost and space
requirements needed for the system. The MC3392 is
extremely effective when used to drive solenoids, as well as
incandescent lamp loads. The following description of the
device’s operation is in reference to the functional blocks of
the Representative Block Diagram shown in Figure 1.
CMOS Input
The input of the MC3392 is CMOS compatible. Input
control performs as true logic. When the input (Vin) is less
than 1.0 V the MC3392 switch is in a high impedance or OFF
state. When Vin is greater than 4.0 V, is in a low impedance or
ON state. The switching threshold of the input is
approximately 2.0 V and is graphed in Figure 7. With the input
at 4.0 V, the input sink current will be approximately 250
μ
A.
In the ON state, the internal protection circuitry is activated
and all of the protection features are available for use. In the
OFF state, however, it is important to note that none of the
protection features are available, with the exception of the
internal inductive load clamp. The input pin is afforded a
minimum of 2000 V ESD protection (Human Body Model) by
virtue of the 7.2 V zener diode.
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