DRV8426PWPR datasheet(34/49 Pages) TI1

Part #	DRV8426PWPR

Description	DRV8426 Stepper Driver With Integrated Current Sense, 1/256 Microstepping, STEP/DIR Interface and smart tune Technology

PDF	49 Pages

Scroll/Zoom	100%

Manufacturer	TI1 [Texas Instruments]

Direct Link	http://www.ti.com

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34 / 49 page

DRV8426

SLOSE55 – MAY 2020

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Product Folder Links: DRV8426

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NOTE

The quiescent power loss is calculated using the typical operating supply current (IVM)

which is dependent on supply-voltage, temperature and device to device variation.

8.2.3.1.4

Total Power Dissipation

The total power dissipation (PTOT) is calculated as the sum of conduction loss, switching loss and the quiescent

power loss as shown in Equation 11.

PTOT = PCOND + PSW + PQ = 0.9-W + 0.1-W + 0.12-W = 1.12-W

(11)

8.2.3.2 Device Junction Temperature Estimation

For an ambient temperature of TA and total power dissipation (PTOT), the junction temperature (TJ) is calculated

as TJ = TA + (PTOT x RθJA)

Considering a JEDEC standard 4-layer PCB, the junction-to-ambient thermal resistance (RθJA) is 33.5 °C/W for

the HTSSOP package and 44.4 °C/W for the VQFN package.

Assuming 25°C ambient temperature, the junction temperature for the HTSSOP package is calculated as shown

below -

TJ = 25°C + (1.12-W x 33.5°C/W) = 62.52 °C

(12)

The junction temperature for the VQFN package is calculated as shown below -

TJ = 25°C + (1.12-W x 44.4°C/W) = 74.73 °C

(13)

DRV8426PWPR Datasheet(PDF) 34 Page - Texas Instruments