ELECTRIC TOY DC MOTOR DRIVE CIRCUIT

DESCRIPTION

UTC UMD9118 is an integrated circuit driven by a single

channel toy DC motor which is designed for low-voltage operated

system. 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.

UTC UMD9118 has on-chip temperature protection function.

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

UTC UMD9118 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 UMD9118, 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.

FEATURES

* H bridge driver of internal PMOS/NMOS power switches

* Can realize 4 functions (forward、backward、standby、brake) of  load motor

* Low output impedance

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