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Motor de Búsqueda de Datasheet de Componentes Electrónicos |
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Motor de Búsqueda de Datasheet de Componentes Electrónicos |
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AN4158 Datasheet(PDF) 28 Page - STMicroelectronics |
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AN4158 Datasheet(HTML) 28 Page - STMicroelectronics |
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28 / 34 page  Setup and optimization AN4158 28/34 DocID023635 Rev 2 5 Setup and optimization In the following sections the optimization of the parameters of the control system is investigated. 5.1 Auto adjusted decay The parameters used in the peak current control with auto adjusted decay and their relation with system performance are listed in Table 7. The optimal setup depends on several factors such as supply voltage, load current, motor characteristics and microstepping resolution. 5.1.1 TON_MIN The minimum on-time value determinates the frequency of use of fast decay during current control and limits the minimum duty cycle value of the control. The on-time measurement starts as soon as a turn-on is requested by the power bridges of the device, as shown in Figure 24. TON_MIN should always be longer than the commutation time of the power bridge, otherwise the minimum on-time condition is always satisfied and the fast decay is never used (the auto adjusted decay feature is actually disabled). This condition causes the current control to fail when the slow decay reduces its effectiveness (see Section 3.1 on page 15 and Section 3.2 on page 17). Table 7. Control system parameters and performance relation Parameter Lower values Higher values TON_MIN Less frequent use of the fast decay Lower ripple Higher probability of control fail More frequent use of the fast decay Higher ripple Higher control stability TOFF(1) 1. The same considerations are valid for TSW when predictive current control is used. Higher switching frequency Lower ripple Higher probability of control fail More frequent use of the fast decay Lower switching frequency Higher ripple Higher control stability Less frequent use of the fast decay TOFF_FAST Lower ripple Longer on-fast sequences Higher probability of control fail Higher ripple Shorter on-fast sequences Higher control stability FAST_STEP Longer on-fast sequences during falling steps (more commutation) Shorter on-fast sequences during falling steps (less commutations) Deeper current undershoot at falling steps |
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