HCPL-315J Datasheet, PDF (17/21 Pages) Agilent(Hewlett-Packard) – 0.5 Amp Output Current IGBT Gate Drive Optocoupler

17
Thermal Model Dual-
Channel (SOIC-16)
HCPL-315J Optoisolator
Definitions
θ₁, θ₂, θ₃, θ₄, θ₅, θ₆, θ₇, θ₈, θ₉,
θ₁₀: Thermal impedances
between nodes as shown in
Figure 28b. Ambient
Temperature: Measured
approximately 1.25 cm above the
optocoupler with no forced air.
LED 1
θ₄
DETECTOR 1
θ₇
θ₈
θ₁
LED 2
θ₂
θ₃
θ₅
DETECTOR 2
θ₁₀
θ₆
θ₉
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 detectors. The
temperature at the LED and the
detector of the optocoupler can
be calculated by using the
equations below.
AMBIENT
Figure 28b. Thermal Impedance Model for HCPL-315J.
∆T_E1A = A₁₁P_E1 + A₁₂P_E2+A₁₃P_D1+A₁₄P_D2
P_E1
P_D1
∆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
P_E2
P_D2
where:
∆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 = 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
impedances θ₁ through θ₁₀.
Thermal Coefficient Data (units in °C/W)
Part Number A₁₁, A₂₂ A₁₂, A₂₁ A₁₃, A₃₁
HCPL-315J
198
64
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