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## L292 Datasheet(PDF) 10 Page - STMicroelectronics

 Part No. L292 Description SWITCH-MODE DRIVER FOR DC MOTORS Download 13 Pages Scroll/Zoom 100% Manufacturer STMICROELECTRONICS [STMicroelectronics] Direct Link http://www.st.com Logo

## L292 Datasheet(HTML) 10 Page - STMicroelectronics

 10 / 13 pageL29210/13Figure 8. Small Signal Step Response (normalized amplitude vs. t / RFCF).V7 = 200 mV/div.IM = 100 mA/div.t = 100µs/div. with VI = 1.5 Vp.It is possible to verify that the L292 works in "closed-loop" conditions during the entire motor current rise-time: the voltage at pin 7 inverting input of the error amplifier) is locked to the reference voltage VR,present at the non-inverting input of the same amplifier.The previous linear analysis is correct for this example.Descresing theξ value, the rise-time of the current decreases. But for a good stability, from relationship(6), the maximum value ofξ is:(phase margin = 45°)b) Large signal reponseThe large step signal response is limited by slew-rate and inductive load.In this case, during the rise-time of the motor current, The L292 works is open-loop condition.CLOSED LOOP SYSTEM BANDWIDTH.A good choice for x is the value 1 / Ö2. In this case :(8)The module of the transfer function is :(9)The cutoff frequency is derived by the expression (9) by putting= 0.707 ·(-3 dB), from which:ξmin1242--------------=IMVI----- s()0.044Rs---------------1sRF CF+12s RF CF2s2RF2CF2++----------------------------------------------------------------------=IMVI-----0.044Rs---------------21ω2RF2CF2+12ωRF CF+()21+[]12–ωRFCF()21+[]⋅----------------------------------------------------------------------------------------------------------------------=IMVI-----0.044Rs---------------ωT0.9RF CF---------------fT0.92πRF CF-----------------------==

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