an44070a Panasonic Corporation of North America, an44070a Datasheet - Page 19

• Manufacturer Part Number: an44070a
• Description: Driver Ic For Dc Motor
• Manufacturer: Panasonic Corporation of North America

AN44070A
13. Power Supply Sequence
14. Charge pump circuit
15. PWM operation
16. IFSEL terminal
17. Check the risk that is caused by the failure of external components.
Usage Notes (continued)
VM – 1.4 V
VM + 5 V
If two types of power supply are used
When recommended sequence is difficult, take the diagram below indicates into consideration and design.
Also, rise slew rate design
If one type of power supply is used
The charge pump circuit has stopped when the Low signal is input to ASTBY(Pin18) and BSTBY(Pin34).
The start time is necessary until the charge pump circuit begins operating. Please take the weight time of 200 μs until the motor
starts rotating after making IC active.
The PWM operation of this IC assumes the control by the input switching of APWM (Pin19) or BPWM (Pin33).
When AN44070A is operated PWM by using other terminals, the duty of the output is extremely different from the duty of the
input. Please use APWM or BPWM when AN44070A is operated PWM.
When Free Run Mode and Forward/Reverse Mode is repeated in PWM operation, the backflow current flows from GND toward
VM. Please add external capacity so as not to exceed the absolute maximum rating of VM.
Do not switch the terminal IFSEL(Pin25) while IC is active Mode.
Please switch IFSEL after the power supply is turned off once or the Low signal is input to ASTBY and BSTBY.
Power Supply
Rise : This IC is recommended rise of 5 V power supply before rise of 24 V power supply.
Fall : Although there is no particular rule, check that VM fall-time is about 1 s.
VM : below 0.1V/μs, VCC : below 0.1V/μs
Rise/Fall slew rate design, VM : below 0.1V/μs
Please check that it is less than 1.0 sec between VCC falling down to 0 volt and VM falling down to 0 volt.
H
L
H
L
Delay : below 100 ms
VPUMP
PWM input
STBY input
Delay : more than 200 μs
VCC
VM
Ver. AEB
1 s
time
time
19