Specification

[AP1034]
016003455-E-01 - 17 - 2016/06
10.4 Protection Functions
Table 11. Recovery type and the output state of the protection circuit
Protection Circuit
H-Bridge Outputs
Recovery type
Thermal Shutdown (TSD)
Hi-Z
Automatic
Under Voltage Lockout (UVLO)
Hi-Z
Automatic
Over Current Protection
(OCP)
Shorted-Load
Hi-Z Latch off
Shorted-to-Ground
Shorted-to-Power
 Thermal Shutdown Circuit (TSD)
If the internal temperature of the IC (Tj) reaches 175 °C (typ), the H-Bridge outputs Hi-Z. In addition, it will
automatically return to the normal operation when it becomes less than 145 °C (typ).
T
TSD
T
J
VOUT
ON
OFF(Hi-Z)
ON
T
TSDHYS
Figure 11. TSD Timing Chart
 Under Voltage Lock Output Circuit (UVLO)
When VM voltage is lower than 6.35V (typ), the H-Bridge output is the Hi-Z. Please note that this circuit does
not operate during sleep mode. When UVLO operates, internal circuits which includes H-Bridge output,
internal regulator, charge pump circuit become disable, and also the control circuit is reset (initialize). If VM
voltage goes up than the specified voltage, UVLO is released. After the UVLO released, it restarts from the
home position. STEP input cannot be input during 3msec after the UVLO is canceled, to wait for the stable
operation of internal charge pump.
VOUT
ON
OFF(Hi-Z)
ON
VM
HYS
=0.5V(typ)
VM
UVLO
VM
3ms(max)
Figure 12. UVLO Timing Chart