전자부품 데이터시트 검색엔진 |
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L6219D 데이터시트(PDF) 4 Page - STMicroelectronics |
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L6219D 데이터시트(HTML) 4 Page - STMicroelectronics |
4 / 9 page FUNCTIONAL DESCRIPTION The circuit is intended to drive both windings of a bipolar stepper motor. The peak current control is generated through switch mode regulation. There is a choice of three different current levels with the two logic inputs I01 - I11 for winding 1 and I02 - I12 for winding 2. The current can also be switched off completely Input Logic (I0 and I1) The current level in the motor winding is selected with these inputs. (See fig. 2) If any of the logic inputs is left open, the circuit will treat it has a high level input. I0 I1 Current Level H H No Current L H Low current V3 IO max H L Medium current 2/3 IO max L L Maximum current IO max Phase This input determines the direction of current flow in the windings, depending on the motor connec- tions. The signal is fed through a Schmidt-trigger for noise immunity, and through a time delay in order to guarantee that no short-circuit occurs in the output stage during phase-shift. High level on the PHASE input causes the motor current flow from Out A through the winding to Out B Current Sensor This part contains a current sensing resistor (RS), a low pass filter (RC, CC) and three comparators. Only one comparator is active at a time. It is acti- vated by the input logic according to the current level chosen with signals Io and I1. The motor current flows through the sensing re- sistor RS. When the current has increased so that the volt- age across RS becomes higher than the refer- ence voltage on the other comparator input, the comparator goes high, which triggers the pulse generator. The max peak current Imax can be defined by: Imax = Vref 10 Rs Single-pulse Generator The pulse generator is a monostable triggered on the positive going edge of the comparator output. The monostable output is high during the pulse time, toff , which is determined by the time compo- nents Rt and Ct. toff = 1.1 ⋅ RtCt The single pulse switches off the power feed to the motor winding, causing the winding current to decrease during toff. If a new trigger signal should occur during toff, it is ignored. Output Stage The output stage contains four Darlington transis- tors (source drivers) four saturated transistors (sink drivers) and eight diodes, connected in two H bridge. Figure 1 ELECTRICAL CHARACTERISTICS (Continued) Symbol Parameter Test Condition Min. Typ. Max. Unit PROTECTION TJ Thermal Shutdown Temperature - 170 - °C L6219 4/9 |
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