Philips Semiconductors

Product specification

PowerMOS transistor

BUK104-50L/S

Logic level TOPFET

BUK104-50LP/SP

FLAG DESCRIPTION

TRUTH TABLE

The flag pin provides a means to

CONDITION

DESCRIPTION

FLAG

detect the presence of the

protection supply and indicate the

NORMAL

Normal operation and adequate

LOGIC LOW

state of the overload detectors.

protection supply voltage

The flag is the open drain of an

n-MOS transistor and requires an

OVER TEMP.

Over temperature detected

LOGIC HIGH

external pull-up resistor

suitable for both 5 V and 10 V logic.

Flag may be used to implement an

SHORT CIRCUIT

Overload condition detected

LOGIC HIGH

external protection strategy

applications which require low input

drive impedance.

SUPPLY FAULT

Inadequate protection supply

LOGIC HIGH

voltage

FLAG CHARACTERISTICS

T

SYMBOL

PARAMETER

CONDITIONS

MIN.

TYP.

MAX.

UNIT

Flag ‘low’

normal operation

V

FS

Flag voltage

I

-

0.15

0.4

V

I

FSS

Flag saturation current

V

-

15

-

mA

Flag ‘high’

overload or fault

I

FS

Flag leakage current

V

-

-

10

µA

V

PSF

Protection supply threshold

V

voltage

BUK104-50L

2.5

3.3

4

V

BUK104-50S

3.3

4.2

5

V

V

(CL)FS

Flag clamping voltage

I

11

13

-

V

Application information

R

F

Suitable external pull-up

V

1

10

50

k

Ω

resistance

V

2

20

100

k

Ω

ENVELOPE CHARACTERISTICS

SYMBOL

PARAMETER

CONDITIONS

MIN.

TYP.

MAX.

UNIT

L

d

Internal drain inductance

Measured from contact screw on

-

3.5

-

nH

tab to centre of die

L

d

Internal drain inductance

Measured from drain lead 6 mm

-

4.5

-

nH

from package to centre of die

L

s

Internal source inductance

Measured from source lead 6 mm

-

7.5

-

nH

from package to source bond pad

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.

January 1993

6

Rev 1.200