[AP1040]

018001836-E-01

2018/06

- 12 -



Under Voltage Detection Circuit

(UVLO)

The AP1040 integrates a low voltage detection circuit in order to prevent malfunction of the IC when

motor drive power supply voltage (VM) is low. If the VM voltage is lower than 6.35 V, the AP1040 sets the

output stage to Hi-Z state. At this time, most internal circuits such as internal regulators and charge

pumps are disabled, and the control logic and protection function are reset (initialized).

Figure 11. Timing Chart of Under Voltage Detection Circuit



Thermal Shutdown Circuit (TSD)

When the internal temperature (Tj) of the IC reaches 175 °C, the thermal shutdown circuit turns off the

output stage (OUT pins = Hi-Z). Since this function , latches off, it is necessary to turn on the motor drive

power supply voltage (VM) again or restart the SLEEPB pin (“L” → “H”) for recovery.

Recovery with VM restart

Recovery with SLEEPB restart

Figure 12. Timing Chart of Thermal Shutdown Circuit