HCPL-3150 Datasheet, PDF (18/22 Pages) Agilent(Hewlett-Packard) – 0.5 Amp Output Current IGBT Gate Drive Optocoupler

Thermal Model Dual-Channel (SOIC-16) HCPL-315J Op-
toisolator
Definitions
θ₁, θ₂, θ₃, θ₄, θ₅, θ₆, θ₇, θ₈, θ₉, θ₁₀: 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
∆T_E1A = A₁₁P_E1 + A₁₂P_E2+A₁₃P_D1+A₁₄P_D2
∆T_E2A = A₂₁P_E1 + A₂₂P_E2+A₂₃P_D1+A₂₄P_D2
∆T_D1A = A₃₁P_E1 + A₃₂P_E2+A₃₃P_D1+A₃₄P_D2
∆T_D2A = A₄₁P_E1 + A₄₂P_E2+A₄₃P_D1+A₄₄P_D2
Figure 28b. Thermal Impedance Model for HCPL-315J.
HCPL-3150 fig 28b
where:
P_E1
∆T_E1A = Temperature difference between ambient and LED 1
∆T_E2A = Temperature difference between ambient and LED 2
∆T_D1A = Temperature difference between ambient and detector 1
∆T_D2A = Temperature difference between ambient and detector 2
P_E1 = Power dissipation from LED 1;
P_E2
P_E2 = Power dissipation from LED 2;
P_D1 = Power dissipation from detector 1;
P_D2 = Power dissipation from detector 2
A_xy thermal coefficient (units in °C/W) is a function of thermal imped-
ances θ₁ through θ₁₀.
P_D1
P_D2
HCPL-3150 fig 28b
Thermal Coefficient Data (units in °C/W)
Part Number
HCPL-315J
A₁₁, A₂₂
198
A₁₂, A₂₁
64
A₁₃, A₃₁
62
A₂₄, A₄₂
64
Note: Maximum junction temperature for above part: 125°C.
A₁₄, A₄₁
83
A₂₃, A₃₂
90
A₃₃, A₄₄
137
A₃₄, A₄₃
69
18