Motor driver ICs
2-phase half-wave motor driver
BA6809F / BA6819AF
The BA6809F and BA6819AF are motor drivers designed ...
Motor driver ICs
2-phase half-wave motor driver
BA6809F / BA6819AF
The BA6809F and BA6819AF are motor drivers designed for 3V and 5V fan motors. Built-in output
transistors reduce the number of external components required. The ICs have an alarm output pin (BA6809F) and Hall output pin (BA6819AF). FApplications Fan motors FFeatures 1) Lock detection and rotational speed sensing mechanisms are built in. 2) Alarm output pin (BA6809F) and Hall output pin (BA6819AF). FAbsolute maximum ratings (Ta = 25_C)
3) Built-in thermal shutdown circuit. 4) Operation assured with a supply voltage as low as 2.7V. 5) Compact 8-pin SOP package.
FRecommended operating conditions (Ta = 25_C)
706
Motor driver ICs
FBlock diagram
BA6809F / BA6819AF
FPin descriptions
FHall input / output truth table
707
Motor driver ICs
FInput / output circuits
BA6809F / BA6819AF
FElectrical characteristics (unless otherwise noted, Ta = 25_C and VCC = 3V)
708
Motor driver ICs
FCircuit operation The BA6809F and BA6819AF have motor lock detection and automatic restart circuits. The timing of lock detection and automatic restart is determined by the external capacitor connected to the LD pin. The charge time of the external capacitor is given by : ton (Charge time)= toff (Discharge time)= C S (VLDCL*VLDCP) ILDC C S (VLDCL*VLDCP) ILDD
BA6809F / BA6819AF
(Typical value) where VLDCL is the LD-pin clamp voltage (1.90V), VLDCP is the LD-pin comparator voltage (0.73V), (2.2µA), ILDC is the LD-pin charge current...