HCPL-3150-360 View Datasheet(PDF) - Avago Technologies
Part Name
Description
MFG CO.
'HCPL-3150-360' PDF : 21 Pages View PDF
Thermal Model Dual-Channel (SOIC-16) HCPL-315J Op-
toisolator
Definitions
T1, T2, T3, T4, T5, T6, T7, T8, T9, T10: Thermal impedances be-
tween nodes as shown in Figure 28b. Ambient Tempera-
ture: Measured approximately 1.25 cm above the opto-
coupler with no forced air.
Description
This thermal model assumes that a 16-pin dual-channel
(SOIC-16) optocoupler is soldered into an 8.5 cm x 8.1
cm printed circuit board (PCB). These optocouplers are
hybrid devices with four die: two LEDs and two detec-
tors. The temperature at the LED and the detector of the
optocoupler can be calculated by using the equations
below.
LED 1
θ4
DETECTOR 1
θ7
θ8
θ1
LED 2
θ2
θ3
θ5
DETECTOR 2
θ10
θ6
θ9
AMBIENT
'TE1A
=
AP
11 E1
+
A P +A P +A P
12 E2 13 D1 14 D2
'TE2A
=
AP
21 E1
+
A P +A P +A P
22 E2 23 D1 24 D2
'TD1A
=
AP
31 E1
+
A P +A P +A P
32 E2 33 D1 34 D2
'TD2A
=
AP
41 E1
+
A P +A P +A P
42 E2 43 D1 44 D2
Figure 28b. Thermal Impedance Model for HCPL-315J.
where:
PE1
PD1
'TE1A = Temperature difference between ambient and LED 1
'TE2A = Temperature difference between ambient and LED 2
'TD1A = Temperature difference between ambient and detector 1
'TD2A = Temperature difference between ambient and detector 2
P = Power dissipation from LED 1;
PE2
PD2
E1
P = Power dissipation from LED 2;
E2
P = Power dissipation from detector 1;
D1
P = Power dissipation from detector 2
D2
A thermal coefficient (units in °C/W) is a function of thermal imped-
xy
ances T1 through T10.
Thermal Coefficient Data (units in °C/W)
Part Number
HCPL-315J
A11, A22
198
A12, A21
64
A13, A31
62
Note: Maximum junction temperature for above part: 125°C.
A24, A42
64
A14, A41
83
A23, A32
90
A33, A44
137
A34, A43
69
17
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