 |
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
| Datasheet File OCR Text: |
| Motor driver ICs 2-phase half-wave motor driver BA6407AF The BA6407AF is a motor driver dedicated to 12V fan motors. Built-in output transistors reduce the number of external components required. The IC has a lock signal output pin. FApplications Fan motors FFeatures 1) Lock detection and rotational speed sensing mechanisms are built in. 2) Compact SOP 8-pin package reduces the number of external components required. FAbsolute maximum ratings (Ta = 25_C) 3) Automatic restart when the motor lock is undone. FRecommended operating conditions (Ta = 25_C) 700 Motor driver ICs FBlock diagram BA6407AF FPin descriptions 701 Motor driver ICs FElectrical characteristics (unless otherwise noted, Ta = 25_C and VCC = 12V) BA6407AF FLock detection The automatic restart circuit detects a motor lock condition and automatically turns off the output current. When the lock condition is cleared, the IC automatically restarts and allow the motor to run. In the BA6407AF, automatic restart is performed as follows. A motor lock condition is detected when the Hall signal stops switching. The output is ON when the LD pin is being charged, and OFF when the pin is being discharged. S The AL pin is ON during normal operation, and OFF when the motor is locked. S The AL pin is an open collector output. Output ON time (TON) and OFF time (TOFF) determined by the LD capacitor C S (VLDCL*VLDCP) TON (Charge time)= ILDC TOFF (Discharge time)= C S (VLDCL*VLDCP) ILDD (Typical value) where C is the capacitance of the LD-pin external capacitor, VLDCL is the LD-pin clamp voltage (2.48V), VLDCP is the LD-pin comparator voltage (0.99V), ILDC is the LD-pin charge current (3.4A), ILDC is the LD-pin discharge current (0.79A). 702 Motor driver ICs FApplication example BA6407AF 703 Motor driver ICs FOperation notes (1) Thermal shutdown circuit The IC has a built-in thermal shutdown circuit. There is a temperature difference of 25_C (typical) between the temperatures at which the circuit is activated and deactivated. BA6407AF VCC R1)R2)RH The Hall current is given by: where RH is the hall device impedance. Fig.3 (2) Power dissipation Power consumed in the IC can be calculated from the following equation : PC=PC1)PC2)PC3 PC1 is power consumed by the supply current. PC1=VCC ICC PC2 is the output current consumption. PC2=VOL IO VOL is the LOW level voltage of output pins 1 and 2. PC3 is power consumed by the AL pin. PC3=VALL IAL where VALL is the AL-pin LOW level voltage and IAL is the AL-pin sink current. Make sure that your application does not exceed the allowable power dissipation of the IC. (3) Hall amplifier input voltage The R1 and R2 resistances must be set so as to maintain the Hall amplifier input bias voltage within the range of 1V to (VCC*2V) including the signal amplitude. It is recommended that the same value be used for both resistors so that the Hall device output signal is centered around VCC / 2. The Hall device may be affected by power supply noise due to the PCB conductor pattern. If you have this problem, insert a capacitor C1 as shown in Fig. 5. If the conductor lines from the Hall device output terminals to the Hall inputs of the IC are particularly long, noise can be picked up and fed into the inputs. If you have this problem, insert a capacitor C2 as shown in Fig. 5. Note that the Hall inputs have no hysteresis in this IC. 704 Motor driver ICs FElectrical characteristic curves BA6407AF FExternal dimensions (Units: mm) 705 |
Price & Availability of BA6407
 |
|
|
|
|
All Rights Reserved © IC-ON-LINE 2003 - 2022 |
| [Add Bookmark] [Contact Us] [Link exchange] [Privacy policy] |
|
Mirror Sites : [www.datasheet.hk]
[www.maxim4u.com] [www.ic-on-line.cn]
[www.ic-on-line.com] [www.ic-on-line.net]
[www.alldatasheet.com.cn]
[www.gdcy.com]
[www.gdcy.net] |