TDE1890 ST Microelectronics, TDE1890 Datasheet - Page 8

• Manufacturer Part Number: TDE1890
• Description: 2A HIGH-SIDE DRIVER INDUSTRIAL INTELLIGENT POWER SWITCH
• Manufacturer: ST Microelectronics

TDE1890 - TDE1891
Therefore:
V
@ V
R
Figure 6: Application Circuit
Figure 7: Max. Output Current vs. Ambient
8/12
s
thj-amb
- All electrical parameters of the device, con-
- Thermal shutdown threshold is at minimum
= 30V, R
cerning the calculation, are at maximum val-
ues.
value.
os
(A)
2.5
2.0
1.5
1.0
0.5
0.0
I o
= 2.5V, Lim = 135 C
= 35 C/W
0
Temperature (Multiwatt without
heatsink, R
DSON0
20
40
= 0.23 , I
P POLLING
th j-amb
60
DC BUS 24V +/-25%
80
= 35 C/W)
q
= 8mA, I
D93IN014
100
+IN
120
-IN
D1
D2
D93IN033
T amb ( C)
os
= 4mA
+
-
GND
It follows:
I
P
From equation 4 we can see that, without any
heatsink, it is not possible to operate in the ON
steady state at the maximum current value. A
derating curve for this case is reported in fig. 7.
Using an external heatsink, in order to obtain a to-
tal R
reported in fig. 8.
Figure 8: Max. Output Current vs. Ambient
outx
CONTROL
os
LOGIC
= 110mW
= 2.5A, R
th
2.5
2.0
1.5
1.0
0.5
0.0
(A)
I o
of 15 C/W, we obtain the derating curve
OUTPUT STATUS
0
Temperature (Multiwatt with heatsink,
R
Ios
th j-amb
20
DSONx
40
+Vs
= 15 C/W)
= 0.386 , P
OUTPUT
60
80
LOAD
q
100
= 240mW,
120
D93IN020A
T amb ( C)