Motor Driver. NTE1885 Datasheet

NTE1885 Driver. Datasheet pdf. Equivalent

Part NTE1885
Description Integrated Circuit Module / 4 Phase Stepping Motor Driver
Feature NTE1885 Integrated Circuit Module, 4 Phase Stepping Motor Driver, 1.75A Features: D Low heat generat.
Manufacture NTE
Datasheet
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NTE1885
NTE1885
Integrated Circuit
Module, 4 Phase Stepping Motor Driver, 1.75A
Features:
D Low heat generation due to constant current chopper system.
D Functions of pause action and power down.
D Able to be used in any stepping motor of hybrid typ, P.M. type, V.R. type.
D Inverter buffer provides direct drive, for 4 phase dual excitation.
D Built in sensing power resistors for load current.
D Protection elements for fly–back voltage are included.
Absolute Maximum Ratings: (TA = +25°C unless otherwise specified)
Supply Voltage, VCC (Quiescent) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50V
Phase Peak Current, IOH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.1A
Operating Case Temperature, TC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +105°C
Junction Temperature, Tj . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +150°C
Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40° to +125°C
Recommended Operating Conditions: (TA = +25°C Unless othrwise specified)
Supply Voltage Range, VCC1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22V to 45V
Phase Peak Current, IOH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5A
Operating Characteristics: (TA = +25°C, VCC1 = 36V, VCC2 = 5V Unless otherwise specified)
Parameter
Symbol
Test Conditions
Min Typ Max Unit
Diode Forward Voltage
Vdf–1 If = 0.3A
– 1.5 1.8 V
Output Saturation Voltage
Vdf–2
Vsat–1
Vsat–2
If = 0.5A
RL = 12, Vin = GND,
VCC1 = 22V
RL = 21, Vin = GND,
VCC1 = 36V
– 1.2 1.6
– 1.2 1.6
V
V
– 2.3 3.0 V
Output Current
OSC Frequency
IO–1
f
0.98 1.05 1.12 A
24 (Fixed OSC) kHz
Thermal Resistance
(Note 1)
θj–c TR1, TR6
TR2, TR3, TR4, TR5
– 8.0 – °C/W
– 13.5 –
Note 1. From Junction of each transistor or diode to substrate



NTE1885
Description of Operation:
Constant Current Chopper Drive
a) When the phase drive input is activated, the motor winding current increases. At a predetermined
current (the rated current of the motor), the applied voltage of the winding begins to be switched
ONOFF to maintain a constant current.
This is the constantcurrent chopper drive by PWM offering a higher efficiency (30% under a cer-
tain condition) than a constantvoltage drive, but causing relatively large noise due to the switch-
ing operation. The PWM method consists of selfexcitation and separate excitation methods. For
the separate excitation, an oscillator is required, as PWM is externally conducted. The self excita-
tion method has a simpler circuit, not requiring an oscillator, but using the resistance and induc-
tance of the motor winding instead.
b) When a voltage several times larger than the rated voltage is applied to the motor, a change in
the winding currents occurs. The time when the currents reach 63.2% of the rated current (IO)
shows a higherspeed response with regard to the rise of the winding current and acts as a time
constant for the RL series network with the rated applied voltage.
c) Without a constant current circuit, over current will ramp up to a constant value, so that a constant
current chopper drive is needed. The chopping is conducted below the constant value, so that
the winding resistance and the rated current must satisfy the following equation:
VCC Vsat
IO <
R
Where
R: Winding resistance per a phase of the motor + RE1
Vsat: Vsat1 + Vsat2
With an increase in winding inductance, the flyback energy is increased and, when transistors for
eachphase drive are OFF, the power loss is increased. Considering b) and c), the following motor
is recommended:
Motor specification (4phase unipolar stepping motor)
Rated current: 1.0 ± 0.5A/phase
Winding resistance: 10/phase
Inductance: 1 10mH/phase
Chopper Operation (Note: TRs are internal transistors used for reference purposes; Ds are inter-
nal protection diodes; and Ls represent the motor windings)
The operation for a unipolar 2phase excitation a of 4phase stepping motor is described as:
When a HighLevel input and a LowLevel input are applied to Pin5 (phase A) and Pin6 (phase
A) respectively, TR2 is turned ON. Since one terminal of 1/2 IC1 (comparator) is at GND potential,
the comparator output (point A becomes High), turning ON TR7. This also causes TR1 to be
turned ON and the current in the winding increases as shown by the equation:
i = VCC V(sat) (l εt/τ)
R
Where
also
τ: = L/R time constant
L: Winding inductance per phase
R: Winding resistance per phase plus emitter resistance, etc.
Vsat: = Vsat1 + Vsat2
Vsat1: VCE(sat) of chopper transistors (TR1, 6)
Vsat2: VCE(sat) of phasedrive transistors (TR2, 3, 4, 5) and Vd (Diodes, internal)







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