
Philips Semiconductors
Product specification
PowerMOS transistor
Logic level TOPFET
BUK106-50L/S
BUK106-50LP/SP
FLAG DESCRIPTION
TRUTH TABLE
The flag pin provides a means to
detect the presence of the
protection supply and indicate the
state of the overload detectors.
The flag is the open drain of an
n-MOS transistor and requires an
external pull-up resistor
1
. It is
suitable for both 5 V and 10 V logic.
Flag may be used to implement an
external protection strategy
2
for
applications which require low input
drive impedance.
CONDITION
DESCRIPTION
FLAG
NORMAL
Normal operation and adequate
protection supply voltage
LOGIC LOW
OVER TEMP.
Over temperature detected
LOGIC HIGH
SHORT CIRCUIT
Overload condition detected
LOGIC HIGH
SUPPLY FAULT
Inadequate protection supply
voltage
LOGIC HIGH
FLAG CHARACTERISTICS
T
mb
= 25 C unless otherwise stated
SYMBOL
PARAMETER
Flag ‘low’
V
FS
Flag voltage
I
FSS
Flag saturation current
Flag ‘high’
I
FS
Flag leakage current
V
PSF
Protection supply threshold
voltage
CONDITIONS
normal operation
I
F
= 1.6 mA
V
FS
= 10 V
overload or fault
V
FS
= 10 V
V
FF
= 5 V; R
F
= 3 k
;
MIN.
TYP.
MAX.
UNIT
-
-
0.15
15
0.4
-
V
mA
-
-
10
μ
A
BUK106-50L
BUK106-50S
2.5
3.3
11
3.3
4.2
13
4
5
-
V
V
V
V
(CL)FS
Flag clamping voltage
Application information
Suitable external pull-up
resistance
I
F
= 1 mA; V
PS
= 0 V
R
F
V
FF
=5 V
V
FF
=10 V
1
2
10
20
50
100
k
k
ENVELOPE CHARACTERISTICS
SYMBOL
L
d
PARAMETER
Internal drain inductance
CONDITIONS
Measured from contact screw on
tab to centre of die
Measured from drain lead 6 mm
from package to centre of die
Measured from source lead 6 mm
from package to source bond pad
MIN.
-
TYP.
3.5
MAX.
-
UNIT
nH
L
d
Internal drain inductance
-
4.5
-
nH
L
s
Internal source inductance
-
7.5
-
nH
1
Even if the flag pin is not used, it is recommended that it is connected to the protection supply via a pull-up resistor. It should not be left
floating.
2
Low pass filtering of the flag signal may be advisable to prevent false tripping.
February 1993
6
Rev 1.200