TDE1798
0.5A INTELLIGENT POWER SWITCH
HIGH OUTPUT CURRENT 500mA
SHORT-CIRCUIT PROTECTION UP TO
V
CC
= +35V
INTERNAL THERMAL PROTECTION WITH
EXTERNAL RESET AND SYNCRONIZATION
CAPABILITY
OPEN GROUND PROTECTION
OUTPUT VOLTAGE CAN BE LOWER THAN
GROUND FOR FAST INDUCTIVE LOAD DE-
MAGNETIZATION
DIFFERENTIAL INPUTS FOR ANY LOGIC
SYSTEM COMPATIBILITY
INPUT VOLTAGE CAN BE HIGHER THAN V
CC
LARGE SUPPLY VOLTAGE RANGE FROM
6V TO 35V
SINK AND SOURCE ALARM OUTPUTS
NO NEED FOR EXTERNAL CLAMPING DI-
ODE FOR DEMAGNETIZATION ENERGY UP
TO 150mJ
SEVERAL DEVICES CAN BE CONNECTED
IN PARALLEL
DESCRIPTION
The TDE1798 is an interface circuit delivering
high currents and capable of driving any type of
loads.
The output is protected from short-circuits with
the positive supply or ground. In addition thermal
shut down is provided to keep the IC from over-
heating. If internal dissipation becomes too high,
the driver will shut down to prevent excessive
heating. The output stays null after the overload is
off, if the reset input is low. If high, the output will
alternatively switch on and off until the overload is
removed.
Higher current can be obtained by paralleling the
outputs of several devices. In this case, the de-
vices can be reactivated simultaneously after an
overload if their reset input are connected in par-
allel.
The device operates over a wide range of supply
voltages from standard
15 operational amplifier
supplies to the single
6V or +35V used for indus-
trial electronic systems. Input voltage can be
higher than the V
CC
. The output is low in open
ground conditions.
November 1991
PIN CONNECTION (Top view)
Minidip
ORDERING NUMBER: TDE1798DP
1/14
BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Test Conditions
Unit
V
CC
Supply Voltage
50
V
V
ID
Input Differential Voltage
50
V
V
I
Input Voltage
-30 to +50
V
V
I(reset)
Reset Input Voltage
VCC -50 to V
CC
V
I
O
Output Current
internally limited
A
P
tot
Power Dissipation
Internally Limited
mW
Reset Input Sink Current (in thermal shut-down)
15
mA
W
D
Repetitive Maximum Demagnetization Energy - 10
6
Operations
150
mJ
T
op
Operating Ambient Temperature Range
-25 to -85
C
T
stg
Storage Temperature Range
-65 to +150
C
I
A(sink)
Alarm Output Sink Current
25
mA
I
A(source)
Alarm Output Source Current
12
mA
TDE1798
2/14
THERMAL DATA
Symbol
Description
Value
Unit
R
th j-case
R
th j-ambient
Thermal Resistance Junction-case (1)
Thermal Resistance Junction-ambient (1)
max.
max.
30
90
C/W
C/W
1) Devices bounded on a 40cm
2
glass-epoxy printed circuit 0.15cm thick with 4cm
2
of copper
ELECTRICAL CHARACTERISTICS (note 2)
TDE -25
C
T
j
+85
C, 6V
V
CC
+35V, I
o
500mA (unless otherwise specified).
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
V
IO
Input Offset Voltage
(note 3)
2
50
mV
I
CC
Power Supply Current
Output High (Tamb = +25
C,
I
o
= 500mA)
Output Low
6.5
2
8
4
mA
mA
I
IB
Input Bias Current
15
40
A
V
ICR
Common-mode Input Voltage
Range
(note 4)
1
45
V
V
I
Input Voltage Range
V
ref
> +1V, (note 4 and 5)
-25
45
V
I
SC
Short-circuit Output Current
V
CC
= 30V, t = 10ms
0.7
0.9
1.3
A
V
CC
- V
O
Output Saturation Voltage
I
O
= 500mA (|V
+
I - V
-
I|> 50mV)
1
1.25
V
I
OL
Output Low Leakage Current
T
j
= +85
C (V
CC
= 30V, V
O
= 0V)
10
100
A
I
(pin 1) source
I
(pin 6) sink
Available Alarm Output Current
Source (V
(pin 1)
= V
CC
- 2.5V)
Sink (in thermal shut-down)
V
(pin 6)
= 2V
4
6
8
15
mA
mA
I
RH
I
RL
Reset Input Current
-1
15
0
40
+1
A
A
V
th
Reset Threshold
0.8
1.4
2
V
I
reset
Reset Output Sink Current
(in thermal shut-down) for
V
reset
+0.8V
2
mA
I
OL(open GND)
Output Leakage Current
(open ground)
10
100
A
V
BRVEO
Output Transistor Avalanche Volt. V
CC
- V
O
65
110
V
Notes:
2) For operating at high temperature, the TDE1798 must be derated based on a 150
C maximum junction temperature and the junction-ambient
thermal resistance.
3) The offset voltage given is the maximum value of input differential voltage required to drive the output voltage within 2V of the ground or the
supply voltage;
4) Input voltage range is independent of the supply voltage;
5) The reference input can be the inverting or the non-inverting one.
TDE1798
3/14
TDE1798
4/14
TYPICAL APPLICATION AUTOMATIC RESET
TYPICAL APPLICATION CONTROLLED RESET
(*) D1 and Z1 needed if the demagnetization energy is higher than 150mJ
SHORT CIRCUIT CONDITIONS WITH AUTOMATIC RESET
TDE1798
5/14
PDF 
ZIP