iC-MFL / iC-MFLT
8-/12-FOLD FAIL-SAFE LOGIC N-FET DRIVER
Rev C1, Page 11/13
OUTPUT VOLTAGE SURGE PROTECTION
An internal protective circuitry allows for short overvolt- to ground via the output resistor which has a typical
age pulses of up to 18 V at the output stages. Puls value of 150 Ω.
duration and duty cycle must be less than 100 ms and
2 % respectively for absolute maximum ratings.
I(OUTx)
[mA]
80
I(OUTx)
[mA]
60
80
−150Ω
40
60
20
−150 Ω
40
V(OUTx)
[V]
20
5
10
15
18
−3mA
3.6 mA
V(OUTx)
[V]
Figure 9: Surge output characteristic at OUTx
with Vin = high
5
15
18
10
Figure 8: Surge output characteristic at OUTx
with Vin = low
The output characteristic in Figure 9 corresponds to
that of the highside driver as shown in Figure 3 for
The output characteristic in Figure 8 corresponds to an output voltage V(OUTx) of up to VCC potential. At
that of the lowside driver as shown in Figure 2 for an higher output voltage, the excess current is diverted to
output voltage V(OUTx) of up to VCC potential. At ground via the output resistor which has a typical value
higher output voltage, the excess current is diverted of 150 Ω.
APPLICATION NOTES
Driving an N-channel MOSFET
One typical field of application for iC-MFL is in the op-
24V
3.3 V
IN1
IN2
IN3
IN4
IN5
IN6
IN7
IN8
EN
OUT1
OUT2
OUT3
OUT4
OUT5
OUT6
OUT7
OUT8
eration of 5 V logic level N-FETs with microprocessor
output signals of 1.8 to 5 V, as shown in Figure 10.
CL
RL
VCC
3.3 V
0 V
T1
Micro-
controller
GND
GNDR
GND
iC-MFL
VCC
Supply- and
Ground Monitor
5 V
Figure 10: Driving an N-channel MOSFET
ICHAUS [ IC-HAUS GMBH ]
