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TDE1898RDP Folha de dados(PDF) 7 Page - STMicroelectronics

Nome de Peças TDE1898RDP
Descrição Electrónicos  0.5A HIGH-SIDE DRIVER INDUSTRIAL INTELLIGENT POWER SWITCH
Download  12 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

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(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
Ω,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
Ω,Pq = 180mW,
Pos = 110mW
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.
+
-
+IN
-IN
D1
D2
CONTROL
LOGIC
Ios
LOAD
OUTPUT
OUTPUT STATUS
GND
µP POLLING
+Vs
DC BUS 24V +/-25%
D93IN014
Figure 5: Application Circuit.
TDE1897R - TDE1898R
7/12


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