IC-MFP Datasheet, PDF (9/13 Pages) IC-Haus GmbH – 8-FOLD FAIL-SAFE P-FET DRIVER

iC-MFP
8-FOLD FAIL-SAFE P-FET DRIVER
DESCRIPTION OF FUNCTIONS
Rev A2, Page 9/13
Lo-level output configuration
The device iC-MFP has three adjustable lo-levels for
driving P-channel fets. The configured lo-level is com-
mon to all outputs NOUTx and the minimum level is
GND potential. The lo-level configuration inputs are
used simultaneous for enabling the lo-level at the out-
puts NOUTx. The hi-level at exactly one input EN5,
EN10 or ENFS configure the voltage of lo-level and en-
able the outputs. If more than one of these inputs have
hi-level the outputs remains disabled. The lo-level VB
- 5 V (configured with EN5 = hi) and VB - 10 V (config-
ured with EN10 = hi) are internally generated by a volt-
age reference and regulated. The lo-level GND (con-
figured with ENFS = hi) is an unregulated connection
to GND. In this case the voltage swing depends directly
from the power supply VB.
Output characteristics of the highside transistor
The highside output transistors at the eight channels
demonstrate a resistive behavior with low voltage (VB
– V(NOUTx)) and behave as a current source with fi-
nite output resistance with higher voltages.
I(NOUTx)
[mA]
3
−2.5
−2
−1.5
−1
−0.5
165 Ω
V(NOUTx)−Vr(NOUTx)
0.5
1
1.5
2
2.5 [V]
−3.6
Figure 3: Output characteristic of the regulated
push-pull-output at NOUTx
Output characteristic of the lowside transistor
The lowside output transistors at the eight channels
demonstrate a resistive behavior with low voltage
V(NOUTx) and behave as a current sink with finite out-
put resistance with higher voltages.
I(NOUTx)
[mA]
3
I(NOUTx)
[mA]
VB − V(NOUTx)
1
2
3
4
5
[V]
−400Ω
−3.6
Figure 2: Output characteristic of the highside tran-
sistor at NOUTx
400 Ω
V(NOUTx)
1
2
3
4
5 ^[V]
Figure 4: Output characteristic of the lowside tran-
sistor at NOUTx
Status output NOK
The status output NOK is a current limited 40 V proof
open-drain output. The output transistor is switched on
if the lo-level of the outputs NOUTx are enabled with
exactly one pin ENx, the outputs have reached the volt-
age levels defined by the inputs INx, the power supply
voltage is above the power-on threshold, the tempera-
ture is below the switch off temperature and all power
supply pins are connected.
Output characteristic of the regulated push-pull-
output at NOUTx
The lo-level VB - 5 V and VB - 10 V is generated with
a regulatetd push-pull output and demonstrate a re-
sistive behavior with low voltage changes and behave
as a current source with finite output resistance with
higher voltage changes.