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Output current capability and IC power dissipation

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Output current capability and IC power dissipation

Figure 18 and Figure 19 show the approximate relation between the output current and the

IC power dissipation using PWM current control driving two loads, for two different driving

types:



One full bridge ON at a time (Figure 18) in which only one load at a time is energized.



Two full bridges ON at the same time (Figure 19) in which two loads at the same time

are energized.

For a given output current and driving type the power dissipated by the IC can be easily

evaluated, in order to establish which package should be used and how large the onboard

copper dissipating area must be in order to guarantee a safe operating junction temperature

(125 °C maximum).

Figure 18. IC power dissipation vs. output current with one full bridge on at a time

Figure 19. IC power dissipation vs. output current with two full bridges ON at the same time