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PDF LB11946 Data sheet ( Hoja de datos )
| Número de pieza | LB11946 | |
| Descripción | PWM Current Control Stepping Motor Driver | |
| Fabricantes | Sanyo Semicon Device | |
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Ordering number : ENN7946
LB11946
Monolithic Digital IC
PWM Current Control Stepping
Motor Driver
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The LB11946 is a stepping motor driver IC that implements PWM current control bipolar drive with a fixed off time.
This IC features 15 current setting levels using a fixed VREF voltage and support for microstepping drive from 1-2
phase excitation drive to 4W1-2 phase excitation drive. This device is optimal for driving stepping motors such as
those used for carriage drive and paper feed in printers.
Features
• PWM current control (with a fixed off time)
• Logic input serial-parallel converter (allows 1-2, W1-2, 2W1-2, and 4W1-2 phase excitation drive)
• Current attenuation switching function (with slow decay, fast decay, and mixed decay modes)
• Built-in upper and lower side diodes
• Simultaneous on state prevention function (through current prevention)
• Noise canceller function
• Thermal shutdown circuit
• Shutoff on low logic system voltage circuit
• Low-power mode control pin
Specifications
Absolute Maximum Ratings at Ta = 25°C
Parameter
Motor supply voltage
Peak output current
Continuous output current
Logic system supply voltage
Logic input voltage range
Emitter output voltage
Allowable power dissipation (IC internal)
Operating temperature
Storage temperature
Symbol
VBB
IO peak
IO max
VCC
VIN
VE
VE
Pdmax
Topr
Tstg
Conditions
tw ≤ 20 µS
VCC = 5 V specifications
VCC = 3.3 V specifications
Ta = 25°C, independent IC
Ratings
50
1.2
1.0
7.0
−0.3 to VCC
1.0
0.5
3.0
−20 to +85
−55 to +150
Unit
V
A
A
V
V
V
V
W
°C
°C
Any and all SANYO Semiconductor products described or contained herein do not have specifications
that can handle applications that require extremely high levels of reliability, such as life-support systems,
aircraft's control systems, or other applications whose failure can be reasonably expected to result in
serious physical and/or material damage. Consult with your SANYO Semiconductor representative
nearest you before using any SANYO Semiconductor products described or contained herein in such
applications.
SANYO Semiconductor assumes no responsibility for equipment failures that result from using products
at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition
ranges, or other parameters) listed in products specifications of any and all SANYO Semiconductor
products described or contained herein.
N2206 / 73004TN(OT) No.7946-1/12
1 page  
LB11946
AC Electrical Characteristics at VCC = 3.3 V
Parameter
Symbol
Clock frequency
Data setup time
Data hold time
Minimum clock high-level pulse width
Minimum clock low-level pulse width
SET pin stipulated time
SET pin signal pulse width
Fclk
TDS
TDH
TSCH
TSCL
Tlat
Tlatw
VCC = 3.3 V
VCC = 3.3 V
VCC = 3.3 V
VCC = 3.3 V
VCC = 3.3 V
VCC = 3.3 V
VCC = 3.3 V
Conditions
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CLK
DATA
SET
Fclk
TSCH TSCL
TDS TDH
D4 D5
D6
Package Dimensions
unit: mm
3147C
min
0.9
0.9
0.9
0.9
0.9
1.9
Ratings
typ
200
2.5
2.5
2.5
2.5
2.5
5.0
max
550
Unit
kHz
µS
µS
µS
µS
µS
µS
D10 D11
Tlat
Tlatw
SANYO : DIP-28H (500mil)
No.7946-5/12
5 Page 
LB11946
Switching Off Time and Noise Canceller Time Calculations
Notes on the CR Pin Setting (switching off time and noise canceller time)
The noise canceller time (Tn) and the switching off time (Toff) are set using the following formulas.
• When VCC is 5 V
Noise canceller time (Tn)
Tn ≈ C⋅R⋅ln{(1.5-RI)/(4.0-RI)}[s]
CR pin charge current: 1.25 mA
Switching off time (Toff)
Toff ≈ −C⋅R⋅ln (1.5/4.8)[s]
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Component value ranges
R: 5.6 kΩ to 100 kΩ
C: 470 pF to 2000 pF
• When VCC is 3.3 V
Noise canceller time (Tn)
Tn≈C⋅R⋅ln {(1.06-RI)/(2.66-RI)}[s]
CR pin charge current: 0.7 mA
Switching off time (Toff)
Toff ≈ −C⋅R⋅ln (1.06/3.1)[s]
VCC line
One-shot mult-
vibrator blanking time
circuit
CR pin
E1
C: 680pF
R: 30 kΩ
CR Pin Internal Circuit Structure
Notes on the MD Pin
• If slow decay mode is set up by setting the D4 and D10 bits in the input serial data to 1, the MD pin must be shorted to
ground.
• If fast decay mode is set up by setting the D4 and D10 bits in the input serial data to 0, mixed decay mode can be set
with the MD pin.
When the VCC = 5 V specifications are used the setting voltage range for mixed decay mode is 1.6 to 3.9 V.
When the VCC = 3.3 V specifications are used the setting voltage range for mixed decay mode is 1.2 to 2.5 V.
If mixed decay mode will not be used with the fast decay mode setting, either:
(a) Short the MD pin to ground to select fast decay mode, or
(b) Short the MD pin to VCC to select slow decay mode.
No.7946-11/12
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LB11946.PDF ] | |
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