BRUSH DC MOTOR DRIVE CIRCUIT

DESCRIPTION

UTC UMD9113 is an integrated brush DC motor drive solution

for battery-powered toys, low-voltage or battery-powered motion

control applications. It has H bridge driver and uses the PMOS and

NMOS power transistors with low output resistance. Low

on-resistance ensures the circuit to consume lower power in

operating at a continuous current, and ensures the circuit to

operate stably for a long time. The circuit has a wide working

voltage range, the maximum continuous output current reaches

1.8A, and the maximum peak output current reaches 3.5A.

UTC UMD9113 has on-chip temperature protection function.

When load motor with low internal resistance is in locked rotor,

UTC UMD9113 output current will increase momentarily, power

dissipation of the circuit will go up sharply, and the chip

temperature will soar. But, when the chip temperature exceeds a

maximum temperature point (typically 150°C) set by internal

temperature protection circuit, the internal circuit will switch off the

on-chip power switching transistor of UTC UMD9113, and switch

off load current, preventing potential safety hazards such as

fuming, igniting, etc. Of plastic package caused by over

temperature. Only after having confirmed that the circuit has

returned to safety temperature, can the on-chip temperature

hysteresis circuit be allowed to re-control the circuit.

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FEATURES

* H bridge driver of internal PMOS/NMOS power switches

* Built-in anti-common state conduction circuit.

* Low output impedance

* Low standby current (typ.0.1μA)

* Low static operational current

* On-chip thermal shut down (TSD) with hysteresis