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Número de pieza | LB11948T | |
Descripción | Monolithic Digital IC PWM Constant Current Control 1-2 Phase Excitation Stepping Motor Driver | |
Fabricantes | Sanyo Semicon Device | |
Logotipo | ||
Hay una vista previa y un enlace de descarga de LB11948T (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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LB11948T
Monolithic Digital IC
PWM Constant Current Control 1-2
Phase Excitation Stepping Motor
Driver
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The LB11948T is a low saturation voltage output PWM current control bipolar drive stepping motor driver. It is
optimal for use as the driver for the miniature low-voltage stepping motors used in portable electronic equipment such
as portable thermal printers.
Features
• PWM current control (external excitation)
• Simultaneous on state prevention function (through current prevention)
• Thermal shutdown circuit
• Noise canceller function
• Low-power mode control pin
Specifications
Maximum Ratings at Ta = 25°C
Parameter
VS supply voltage
Logic system supply voltage
Peak output current
Continuous output current
Emitter output voltage
Input voltage
Allowable power dissipation
Operating temperature
Storage temperature
Note ∗: Specified PCB: 114.3 × 76.1 × 1.6 mm
Symbol
VS
VCC
IOpeak
IOmax
VE
VIN
Pdmax
Topg
Tstg
Conditions
tW ≤ 20 µS
Mounted on the specified PCB*
Recommended Operating Conditions at Ta = 25°C
Parameter
Symbol
VS supply voltage
VS
VCC supply voltage
Reference voltage
VCC
VREF
Conditions
Ratings
−0.3 to +18
−0.3 to +18
0.5
0.4
1.0
−0.3 to VCC
1.2
−20 to +85
−40 to +150
Unit
V
V
A
A
V
V
W
°C
°C
Ratings
3.0 to 15
3.0 to 15
0.0 to 0.5
Unit
V
V
V
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 / D1504TN(OT) / 81004TN(OT) No.7947-1/12
1 page Block Diagram
10 µF
ENABLE1
VCC
LB11948T
PHASE1
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ENABLE2
PHASE2
Blanking
time
_
+
ST
S-GND
Blanking
time
Thermal
shutdown circuit
Rveofeltraegnece
OSC
_
+
1VREG
30 kΩ
10 kΩ
CR VCC VREF2 VREF1
56 kΩ
680 pF
VS1
OUT1
OUT1-
10 µF
Stepping
motor
E1
1Ω
VS2
OUT2
OUT2-
E2
1Ω
P-GND
P-GND
No.7947-5/12
5 Page LB11948T
Usage Notes
Simplified Formulas for Determining Resistor and Capacitor Values
The formulas for setting the rise time (T1) and the fall time (T2) for the RC oscillator are shown below.
T1 ≈ 0.44C⋅ R (s)
T2 ≈ 0.72⋅ (C⋅R⋅100)/(R + 1000) (s)
Set the oscillator frequency using the simplified formulas shown above.
Note that the T2 triangle wave fall time is the noise canceller circuit operating time.
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R C circuit waveform
T1 T2
Setting the Constant Current Level
The reference voltage VREF1 and VREF2 can be set by voltage dividing the 1 V regulator output.
The output current is set by the voltage applied to the VREF pins and the resistors RE connected between the E1 and
E2 pins and ground.
The output current is set according to the following equation: IO = VREF/Re (A)
VREF voltage operating range: 0 to 1 V
E1 pin voltage range: 0 to 1 V
Notes on the VREF Pins
• Since the VREF pins are the input pins for the reference voltage used to set the current, applications must be
designed so that noise that could influence circuit operation does not occur at these pins.
Notes on the Ground Pins
Since this IC switches large currents, the following notes on ground lines must be observed.
• The PCB pattern lines in areas that handle large currents must be as wide as possible so as to have low impedances,
and must be kept as far as possible from the small signal systems.
• The ground terminals on the sensing resistors Re connected to the E pins (E1 and E2) must be connected as close as
possible to the IC GND (pin 21), PGND (pin 22), or DGND (pins 5 and 26) pins as possible.
• The capacitors between VCC and ground and between VBB and ground must be as close as possible to the
corresponding VCC and VBB pin in the pattern.
No.7947-11/12
11 Page |
Páginas | Total 12 Páginas | |
PDF Descargar | [ Datasheet LB11948T.PDF ] |
Número de pieza | Descripción | Fabricantes |
LB11948T | Monolithic Digital IC PWM Constant Current Control 1-2 Phase Excitation Stepping Motor Driver | Sanyo Semicon Device |
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