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AN44071A-VF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P35
AN44071A
25
Ver. BEB
APPLICATIONS INFORMATION
1. Notes
1) Pulse blanking time
This LSI has pulse blanking time (0.7 µs/Typ. value) to prevent erroneous current detection caused by noise.
Therefore, the motor current value will not be less than current determined by pulse blanking time. Pay attention at
the time of low current control. The relation between pulse blanking time and minimum current value is shown as
Chart 1. In addition, increase-decrease of motor current value is determined by L value, wire wound resistance,
induced voltage and PWM on Duty inside a motor.
T
B
T
PWM
At normal operation
In case of setting less
than minimum current
value
Setup current value
Setup current value
Minimum current value
T
PWM
: PWM OFF period
T
B
: Pulse blanking time
Chart 1. RCS current waveform
2) VREF voltage
When VREF* voltage is set to Low-level, erroneous detection of current might be caused by noise because
threshold of motor current detection comparator becomes low (= VREF/10 × motor current ratio [%] .
Use this LSI after confirming no misdetection with setup VREF* voltage.
If VREF* pin is open, input voltage might be irregular and rise, a large current might flow to the output. Therefore
do not use on condition that VREF* pin is open.
3) Notes on interface
Absolute maximum of Pin 6 to 8, Pin 12, Pin 21 to 23, Pin 34 to 40 and Pin 44 to 51 is –0.3 V to 6 V. When the
setup current for a motor is large and lead line of GND is long, GND pin potential might rise. Take notice that
interface pin potential is negative to difference in potential between GND pin reference and interface pin in spite
of inputting 0 V to the interface pin. At that time, pay attention allowable voltage range must not be exceeded.
4) Notes on test mode
When inputting voltage of above 0.6 V and below 4.0 V to TEST (Pin 12), this LSI might become test mode.
When disturbance noise etc. makes this LSI test mode, motor might not operate normally. Therefore, use this
LSI on condition that TEST pin is shorted to GND or S5VOUT at normal motor operation.
AN44071A
26
Ver. BEB
APPLICATIONS INFORMATION ( continued )
1. Notes (continued)
5) Notes on Standby mode release / Under-voltage lockout release
This LSI has all motor outputs OFF period of about 100 µs (typ) owing to release of Standby and UVLO (Refer to
the below figure).
This is why restart from Standby and UVLO after charge pump voltage rises sufficiently because charge pump
operation stops at Standby and UVLO.
When the charge pump voltage does not rise sufficiently during all motor outputs OFF period due to that
capacitance between VPUMP and GND becomes large etc., the LSI might overheat and it might not operate
normally. In this case, release Standby and UVLO at ENABLE = Low-level, and restart at ENABLE = High-level
after the charge pump voltage rises sufficiently.
Moreover, take notice that state of motor current becomes default position at Standby and UVLO operation
following as 1. Notes No.6.
After all motor outputs OFF period, the ground-fault detection period is set to about 6.4 µs in order to detect the
ground-fault of motor output before motor is turned on.
All the upper side power MOS are turned on during the above ground fault detection period, and then whether the
ground-fault occurs or not is checked. (Refer to the following contents.)
If the ground-fault is detected at that time, all motor outputs are turned off, and motor drive stops.
Motor output
Standby
Standby
All motor outputs OFF
Start (At ENABLE = High)
All motor outputs OFF
(At ENABLE = Low)
STBY
About 100 µs(typ)
Low
High
Motor output
VM
About 100 µs(typ)
Low
High
All motor outputs
OFF (UVLO)
[At Standby release]
[At under-voltage lockout release]
Standby release
Ground fault
detection
Ground fault
detection
About 6.4 µs(typ)
About 6.4 µs(typ)
All motor outputs OFF
Start (At ENABLE = High)
All motor outputs OFF
(At ENABLE = Low)
All motor outputs
OFF
AN44071A
27
Ver. BEB
APPLICATIONS INFORMATION ( continued )
1. Notes (continued)
6) Default of motor current state
The defaults of motor current state after the releases of UVLO and standby in each excitation mode are as follows.
Table Default position of each excitation mode
Default electrical
angle*
Excitation mode
–45°1-2 phase excitation (8-step)
–45°W1-2 phase excitation (16-step)
–45°2W1-2 phase excitation (32-step)
–45°Half step (8-step)
–45°2-phase excitation (4-step)
*Definition of electric angle
Electric angle is defined as 0° on the conditions of
AOUT1/COUT1
current = 100% and BOUT1/DOUT1 current = 0%.
It is defined at DIR = Low as "+" direction.
It is defined at DIR = High as "–" direction.
AOUT1/COUT1 current
BOUT1/DOUT1 current
Default electrical angle : –45°
DIR = "L"
DIR = "H"
Default position: 2-phase excitation / Half step
Default position :
1-2 / W1-2 / 2W1-2 phase excitation
Electrical angle : 0°
7) CLK* input signal and DIR* input signal
The set/hold time of CLK* and DIR* input signals, CLK* input minimum pulse width (High/Low) are as follows.
Input signals after securing set/hold time.
A
B
C
D
CLK*
DIR*/ST1*/
ST2*/ST3*
10 µs or moreCLK* input minimum pulse width (High)A
10 µs or moreCLK* input minimum pulse width (Low)B
DIR*/ST1*/ST2*/ST3* hold time
DIR*/ST1*/ST2*/ST3* set time
Contents TimePeriod
2 µs or moreD
2 µs or moreC
* : AB or CD
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P35

AN44071A-VF

Mfr. #:
Buy AN44071A-VF
Manufacturer:
Panasonic
Description:
Motor / Motion / Ignition Controllers & Drivers Stepping Motor Drivr HSOP056-P-0300B
Lifecycle:
New from this manufacturer.
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