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Βρίσκεστε εδώ: Αρχική σελίδαΗλεκτρονικό κατάστημαΑΝΤΑΛΛΑΚΤΙΚΑ - ΕΞΑΡΤΗΜΑΤΑ - SERVICEΗΛΕΚΤΡΟΝΙΚΑ ΕΞΑΡΤΗΜΑΤΑ ΑΝΤΑΛΛΑΚΤΙΚΑΟΛΟΚΛΗΡΩΜΕΝΑ ΚΥΚΛΩΜΑΤΑ ICΟλοκληρωμένα διάφοραID=2360

IC NJM37717E2 ΟΛΟΚΛΗΡΩΜΕΝΟ ΟΔΗΓΗΣΗΣ STEP MOTOR 37717

ID=2360

JRC NJM37717E2 NJM-37717-E2 ολοκληρωμένο κύκλωμα οδήγησης κινητήρων step motor το οποίο συνεργάζεται με το njm3717. Διατίθεται σε 2 τύπους, ανάλογα με το κέλυφος. NJM37717 is a stepper motor diver, which consists of a LS-TTL compatible logic input stage, a current sensor, a monostable multivibrator and a high power H-bridge output stage with built-in protection diodes. NJM37717 is a high voltage version and pin compatible with NJM3717. The output current is up to 1200mA. Two NJM37717 and a small number of external components from a complete control and drive unit for stepper moter system. n FEATURES • Half-step and full-step modes • Switched mode bipolar constant current drive • Wide range of current control 5 - 1200 mA • Wide voltage range 10 - 60 V • Thermal overload protection • Packages DIP16. FUNCTIONAL DESCRIPTION The NJM37717 is intended to drive a bipolar constant current through one motor winding of a 2-phase stepper motor. Current control is achieved through switched-mode regulation, see figure 4 and 5. Three different current levels and zero current can be selected by the input logic. The circuit contains the following functional blocks: • Input logic • Current sense • Single-pulse generator • Output stage Input logic Phase input. The phase input determines the direction of the current in the motor winding. High input forces the current from terminal MA to MB and low input from terminal MB to MA. A Schmitt trigger provides noise immunity and a delay circuit eliminates the risk of cross conduction in the output stage during a phase shift. Half- and full-step operation is possible. Current level selection. The status of I0 and I1 inputs determines the current level in the motor winding. Three fixed current levels can be selected according to the table below. Motor current I0 I1 High level 100% L L Medium level 60% H L Low level 20% L H Zero current 0% H H The specific values of the different current levels are determined by the reference voltage VR together with the value of the sensing resistor RS. The peak motor current can be calculated as follows: im = (VR • 0.083) / RS [A], at 100% level im = (VR • 0.050) / RS [A], at 60% level im = (VR • 0.016) / RS [A], at 20% level The motor current can also be continuously varied by modulating the voltage reference input. Current sensor The current sensor contains a reference voltage divider and three comparators for measuring each of the selectable current levels. The motor current is sensed as a voltage drop across the current sensing resistor, RS, and compared with one of the voltage references from the divider. When the two voltages are equal, the comparator triggers the single-pulse generator. Only one comparator at a time is activated by the input logic. Single-pulse generator The pulse generator is a monostable multivibrator triggered on the positive edge of the comparator output. The multivibrator output is high during the pulse time, toff , which is determined by the timing components RT and CT. toff = 0.69 • RT • CT The single pulse switches off the power feed to the motor winding, causing the winding to decrease during toff.If a new trigger signal should occur during toff , it is ignored. Output stage The output stage contains four transistors and four diodes, connected in an H-bridge. The two sinking transistors are used to switch the power supplied to the motor winding, thus driving a constant current through the winding. See figures 4 and 5. Overload protection The circuit is equipped with a thermal shut-down function, which will limit the junction temperature. The output current will be reduced if the maximum permissible junction temperature is exceeded. It should be noted, however, that it is not short circuit protected. Operation When a voltage VMM is applied across the motor winding, the current rise follows the equation: im = (VMM / R) • (1 - e-(R • t ) / L ) R = Winding resistance L = Winding inductance t = time (see figure 5, arrow 1) The motor current appears across the external sensing resistor, RS, as an analog voltage. This voltage is fed through a low-pass filter, RCCC, to the voltage comparator input (pin 10). At the moment the sensed voltage rises above the comparator threshold voltage, the monostable is triggered and its output turns off the conducting sink transistor. The polarity across the motor winding reverses and the current is forced to circulate through the appropriate upper protection diode back through the source transistor (see figure 5, arrow 2). After the monostable has timed out, the current has decayed and the analog voltage across the sensing resistor is below the comparator threshold level. The sinking transistor then closes and the motor current starts to increase again, The cycle is repeated until the current is turned off via the logic inputs. By reversing the logic level of the phase input (pin 8), both active transistors are turned off and the opposite pair turned on after a slight delay. When this happens, the current must first decay to zero before it can reverse. This current decay is steeper because the motor current is now forced to circulate back through the power supply and the appropriate sinking transistor protection diode. This causes higher reverse voltage build-up across the winding which results in a faster current decay (see figure 5, arrow 3). For best speed performance of the stepper motor at half-step mode operation, the phase logic level should be changed at the same time the current-inhibiting signal is applied. Applications Information Motor selection Some stepper motors are not designed for continuous operation at maximum current. As the circuit drives a constant current through the motor, its temperature can increase, both at low- and high-speed operation. Some stepper motors have such high core losses that they are not suited for switched-mode operation. Interference As the circuit operates with switched-mode current regulation, interference-generation problems can arise in some applications. A good measure is then to decouple the circuit with a 0.1 μF ceramic capacitor, located near the package across the power line VMM and ground. Also make sure that the VR input is sufficiently decoupled. An electrolytic capacitor should be used in the +5 V rail, close to the circuit. The ground leads between RS, CC and circuit GND should be kept as short as possible. This applies also to the leads connecting RS and RC to pin 16 and pin 10 respectively. In order to minimize electromagnetic interference, it is recommended to route MA and MB leads in parallel on the printed circuit board directly to the terminal connector. The motor wires should be twisted in pairs, each phase separately, when installing the motor system. Unused inputs Unused inputs should be connected to proper voltage levels in order to obtain the highest possible noise immunity. Ramping A stepper motor is a synchronous motor and does not change its speed due to load variations. This means that the torque of the motor must be large enough to match the combined inertia of the motor and load for all operation modes. At speed changes, the requires torque increases by the square, and the required power by the cube of the speed change. Ramping, i.e., controlled acceleration or deceleration must then be considered to avoid motor pullout. VCC , VMM The supply voltages, VCC and VMM , can be turned on or off in any order. Normal dV/dt values are assumed. Before a driver circuit board is removed from its system, all supply voltages must be turned off to avoid destructive transients from being generated by the motor. Analog control As the current levels can be continuously controlled by modulating the VR input, limited microstepping can be achieved. Switching frequency The motor inductance, together with the pulse time, toff , determines the switching frequency of the current regulator. The choice of motor may then require other values on the RT ,CT components than those recommended in figure7, to obtain a switching frequency above the audible range. Switching frequencies above 40 kHz are not recommended because the current regulation can be affected. Sensor resistor The RS resistor should be of a non-inductive type, power resistor. A 1.0 ohm resistor, tolerance £ 1%, is a good choice for 415 mA max motor current at VR = 5V. The peak motor current, im , can be calculated by using the formulas: im = (VR • 0.083) / RS [A], at 100% level im = (VR • 0.050) / RS [A], at 60% level im = (VR • 0.016) / RS [A], at 20% level Heatsinking The junction temperature of the chip highly effects the lifetime of the circuit. In high-current applications, the heatsinking must be carefully considered. The Rthj-a of the NJM37717 can be reduced by soldering the ground pins to a suitable copper ground plane on the printed circuit board (see figure 10) or by applying an external heatsink type V7 or V8, see figure 9. The diagram in figure 16 shows the maximum permissible power dissipation versus the ambient temperature in °C, for heatsinks of the type V7, V8 or a 20 cm2 copper area respectively. Any external heatsink or printed circuit board copper must be connected to electrical ground. For motor currents higher than 500 mA, heatsinking is recommended to assure optimal reliability. The diagrams in figures 9 and 10 can be used to determine the required heatsink of the circuit. In some systems, forced-air cooling may be available to reduce the temperature rise of the circuit.


IC NJM37717E2 ΟΛΟΚΛΗΡΩΜΕΝΟ ΟΔΗΓΗΣΗΣ STEP MOTOR 37717
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Κατασκευαστής: JRC NJR NISSHINBO

[njm37717e2 njm 37717 e2 NJM 37717 E2]

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