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TDE1898RFP View Datasheet(PDF) -

Part Name
Description
Manufacturer
TDE1898RFP
 
TDE1898RFP Datasheet PDF : 0 Pages
(625mA instead of 500mA).
- All electrical parameters of the device, con-
cerning the calculation, are at maximum val-
ues.
- Thermal shutdown threshold is at minimum
value.
- No heat sink nor air circulation (Rth equal to
Rthj-amb).
Therefore:
Vs = 30V, RDSON0 = 0.6, Iq = 6mA, Ios = 4mA @
Vos = 2.5V, ΘLim = 135°C
Rthj-amb = 100°C/W (Minidip); 90°C/W (SO20);
70°C/W (SIP9)
It follows:
Ioutx = 0.625mA, RDSONx = 1.006, Pq = 180mW,
Pos = 110mW
Figure 5: Application Circuit.
TDE1897R - TDE1898R
From equation 4, we can find:
Tambx = 66.7°C (Minidip);
73.5°C (SO20);
87.2°C (SIP9).
Therefore, the IPS TDE1897/1898, although
guaranteed to operate up to 85°C ambient tem-
perature, if used in the worst conditions, can meet
some limitations.
SIP9 package, which has the lowest Rthj-amb, can
work at maximum operative current over the en-
tire ambient temperature range in the worst condi-
tions too. For other packages, it is necessary to
consider some reductions.
With the aid of equation 3, we can draw a derat-
ing curve giving the maximum current allowable
versus ambient temperature. The diagrams, com-
puted using parameter values above given, are
depicted in figg. 6 to 8.
If an increase of the operating area is needed,
heat dissipation must be improved (Rth reduced)
e.g. by means of air cooling.
DC BUS 24V +/-25%
+IN
+
-IN
-
CONTROL
LOGIC
+Vs
OUTPUT
D1
µP POLLING
D2
GND
Ios
OUTPUT STATUS
LOAD
D93IN014
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