DRV8824_16 Datasheet, PDF (5/35 Pages) Texas Instruments – Stepper Motor Controller IC

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DRV8824
SLVSA06J – OCTOBER 2009 – REVISED JULY 2014
7.4 Thermal Information
THERMAL METRIC
R_θJA
R_θJC(top)
R_θJB
ψ_JT
ψ_JB
R_θJC(bot)
Junction-to-ambient thermal resistance⁽¹⁾
Junction-to-case (top) thermal resistance⁽²⁾
Junction-to-board thermal resistance⁽³⁾
Junction-to-top characterization parameter⁽⁴⁾
Junction-to-board characterization parameter⁽⁵⁾
Junction-to-case (bottom) thermal resistance⁽⁶⁾
DRV8824
PWP (28 PINS)
RHD (28 PINS)
38.9
35.8
23.3
25.1
21.2
8.2
0.8
0.3
20.9
8.2
2.6
1.1
UNIT
°C/W
(1) The junction-to-ambient thermal resistance under natural convection is obtained in a simulation on a JEDEC-standard, high-K board, as
specified in JESD51-7, in an environment described in JESD51-2a.
(2) The junction-to-case (top) thermal resistance is obtained by simulating a cold plate test on the package top. No specific JEDEC-
standard test exists, but a close description can be found in the ANSI SEMI standard G30-88.
(3) The junction-to-board thermal resistance is obtained by simulating in an environment with a ring cold plate fixture to control the PCB
temperature, as described in JESD51-8.
(4) The junction-to-top characterization parameter, ψ_JT, estimates the junction temperature of a device in a real system and is extracted
from the simulation data for obtaining θ_JA, using a procedure described in JESD51-2a (sections 6 and 7).
(5) The junction-to-board characterization parameter, ψ_JB, estimates the junction temperature of a device in a real system and is extracted
from the simulation data for obtaining θ_JA , using a procedure described in JESD51-2a (sections 6 and 7).
(6) The junction-to-case (bottom) thermal resistance is obtained by simulating a cold plate test on the exposed (power) pad. No specific
JEDEC standard test exists, but a close description can be found in the ANSI SEMI standard G30-88.
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