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L6242 Scheda tecnica(PDF) 2 Page - STMicroelectronics |
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L6242 Scheda tecnica(HTML) 2 Page - STMicroelectronics |
2 / 5 page APPLICATION INFORMATIONS Figure 1 shows the L6242 configurated as a tran- sconductance amplifier, in order to drive linear motors as Voice Coil (VCM). The L6242 provides the power section of the Transconductance Am- plifier. The two OP AMP are configurated one as inverting and the other as noninverting amplifier, with the same gain. Working in push-pull, they can be configurated as a bridge. The motor cur- rent can be controlled by means of the sense re- sistor (typical 1 Ω) in series with the motor. The current sense amplifier provides the feedback sig- nal, which is summed to the driving signal at the node which is the inverting input of the Error Am- plifier. R1 closes the control loop. R2 converts the input voltage signal, into a current signal. The snubber network provides the system stabil- ity, always required by the application. The net- work is directly connected to the output pins of the IC, OUT1 and OUT2, and in parallel with the load. R4 and C2 could be of different values, de- pending on the p.c.b. configuration and on the motor characteristics. The DC transfer function may be expressed as: gm = Iout/Vin = k • (R1/R2) where k = 1/(Rsense • Ad) and Ad = gain of the current sense amplifier. ABSOLUTE MAXIMUM RATINGS Symbol Parameter Value Unit VS Supply Voltage 28 V Vi Input Voltage VS V Vi Differential Input Voltage ±VS V IO DC Output Current 1 A IP Peak Output Current (non repetitive) 1.5 A Ptot Maximum Power Dissipation at Tamb =85 °C TCASE =75 °C 1 5 W W Tstg,TJ Storage and Junction Temperature Range -40 to 150 °C ELECTRICAL CHARACTERISTICS (VS = 12V, TJ =25 °C unless otherwise specified) Symbol Parameter Test Condition Min. Typ. Max. Unit VS Supply Voltage 4 28 V IS Quiescent Drain Current VO =VS/2 10 15 mA Ib Input Bias Current 0.2 1 µA VOS Input Offset Voltage 15 mV IOS Input Offset Current 10 50 nA Sr Slew Rate 1.5 V/ µs Ri Input Resistance 500 K Ω GV Open Loop Voltage Gain f = 100Hz 70 80 dB CMR Common Mode Rejection f = 100Hz 66 84 dB SVR Supply Voltage Rejection f = 100Hz Rg = 10K Ω Vr = 0.5V 54 dB Vdrop High Drop Voltage I = 100mA I = 500mA 0.7 1 1.5 V V Vdrop Low Drop Voltage I = 100mA I = 500mA 0.3 0.6 1 V V Tsd Thermal Shutdown Junction Temperature 145 °C Rp Internal Pull-up Resistor of the Enable Input 50 K Ω Ve Enable Low Voltage TJ = 130 °C -0.3 1.2 V Ieq Quiescent Drain Current En = L 2 5 mA Td Enable Delay 50 µs Iol Output Leakage Current 10 µA L6242 2/5 |
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