SGS-Thomson L292 free download

File name l292.pdf

L292 SWITCH-MODE DRIVER FOR DC MOTORS DRIVING CAPABILITY : 2 A, 36 V, 30 KHz 2 LOGIC CHIP ENABLE EXTERNAL LOOP GAIN ADJUSTEMENT SINGLE POWER SUPPLY (18 TO 36 V) INPUT SIGNAL SYMMETRIC TO GROUND THERMAL PROTECTION DESCRIPTION The L292 is a monolithic LSI circuit in 15-lead Multiwatt ® package. It is intendedfor use, together with L290 and L291, as a complete 3-chip motor positioning system for applications such as carriage/daisy-wheel position control in type-writes. The L290/1/2 system can be directly controlled by a microprocessor. ABSOLUTE MAXIMUM RATINGS Symbol Vs Vi Vinhibit Io Ptot Tstg Power Supply Input Voltage Inhibit Voltage Output Current Total Power Dissipation (Tcase = 75 °C) Storage and Junction Temperature Parameter Value 36 - 15 to + Vs 0 to Vs 2.5 25 - 40 to + 150 Unit V V V A W °C Multiwatt 15 ORDER CODE : L292 TRUTH TABLE Vinhibit Pin 12 L L H H March 1993 Pin 13 L H L H Disabled Normal Operation Disabled Disabled Output Stage Condition CONNECTION DIAGRAM (top view) 1/12 L292 THERMAL DATA Symbol Rth-j-case Parameter Thermal resistance junction-case Max Value 3 Unit °C/W ELECTRICAL CHARACTERISTICS (Vs = 36 V, Tamb = 25 °C, fosc = 20 KHz unless otherwise specified) Symbol Vs Id Vos Vinh Parameter Supply Voltage Quiescent Drain Current Input Offset Voltage (pin 6) Inhibit Low Level (pin 12, 13) Inhibit High Level (pin 12, 13) Iinh Low Voltage Condition High Voltage Conditions Ii Vi Input Current (pin 6) Input Voltage (pin 6) Vinh(L) = 0.4 V Vinh(H) = 3.2 V Vl = -8.8 V Vl = +8.8 V Rs1 = Rs2 = 0.2 Io = 2A Io = -2A Io VD Output Current Total Drop Out Voltage Vl = ± 9.8 V Rs1 = Rs2 = 0.2 (inluding sensing resistors) Io = 2 A Io = 1 A VRS Io Vi fosc Sensing Rsistor Voltage Drop Transconductance Tj = 150°C Rs1 = Rs2 =0.2 Rs1 = Rs2 = 0.4 Frequency Range (pin 10) 1 Io = 2 A 205 220 120 30 ±2 5 3.5 0.44 235 9.1 -9.1 3.2 - 100 10 -1.8 0.5 Vs = 20 V (offset null) Io = 0 Test conditions Min. 18 30 Typ. Max. 36 50 ±350 2 Unit V mA mV V V µA µA mA mA V V A V V V mA/V mA/V KHz BLOCK DIAGRAM AND TEST CIRCUIT 2/12 L292 SYSTEM DESCRIPTION The L290, L291 and L292 are intended to be used as a 3-chip microprocessor controlled positioning system. The device may be used separately - particularly the L292 motor driver - but since they will usually be used together, a description of a typical L290/1/2 system follows. At the time, the microprocessor orders a switch to the position mode, (strobe signal at pin 8 of L291) and within 3 to 4 ms the L292 drives the motor to a null position, where it is held by electronic "detenting". The mechanical/electrical interface consists of an Figure 1. System Block Diagram The system operates in two modes to achieve high speed, high-accurancy positioning. Speed commands for the system originate in the microprocessor. It is continuosly updated on the motor position by means of pulses from the L290 tachometer chip, whitch in tur gets its information from the optical encoder. From this basic input, the microproc