NCV8184(2004) 데이터 시트보기 (PDF) - ON Semiconductor
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NCV8184 Datasheet PDF : 14 Pages
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NCV8184
APPLICATION NOTES
VOUT Short to Battery
The NCV8184 will survive a short to battery when hooked
up the conventional way as shown in Figure 19. No damage
to the part will occur. The part also endures a short to battery
when powered by an isolated supply at a lower voltage as in
Figure 20. In this case the NCV8184 supply input voltage is
set at 7 V when a short to battery (14 V typical) occurs on
VOUT which normally runs at 5 V. The current into the
device (ammeter in Figure 20) will draw additional current
as displayed in Figure 21.
Short to battery
Loads
VOUT 70 mA
VOUT
C2**
10 mF
GND
VIN
GND
B+
C1*
1.0 mF
+ Automotive Battery
− typically 14 V
GND
GND
Adj
VREF/
ENABLE
VOUT = VREF
C3***
10 nF
Figure 19.
5.0 V
+
5.0 V
−
Short to battery
A
Automotive Battery
typically 14 V
VOUT
Loads
C2**
10 mF
70 mA
VOUT
GND
VIN
GND
GND
GND
* C1 is required if the regulator is far from the power source filter.
** C2 is required for stability.
*** C3 is recommended for EMC susceptibility.
Adj
VREF/
ENABLE
VOUT = VREF
Figure 20.
B+
C1* 7 V +
1.0 mF
−
C3***
10 nF
5.0 V
+
5.0 V
−
18
16
14
12
10
8
6
4
2
0
5 6 7 8 9 10 1112 131415 1617 181920 2122 2324 25 26
VOUT VOLTAGE (V)
Figure 21. VOUT Short to Battery
Switched Application
The NCV8184 has been designed for use in systems where
the reference voltage on the VREF/ENABLE pin is
continuously on. Typically, the current into the
VREF/ENABLE pin will be less than 1.0 mA when the
voltage on the VIN pin (usually the ignition line) has been
switched out (VIN can be at high impedance or at ground.)
Reference Figure 22.
Ignition
VOUT
Switch
C2
10 mF
VOUT
GND
VIN
GND
C1
1.0 mF
VBAT
GND
GND
Adj
VREF/
ENABLE
< 1.0 mA
Figure 22.
VREF
5.0 V
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