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L6221C Datasheet(PDF) 9 Page - STMicroelectronics |
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L6221C Datasheet(HTML) 9 Page - STMicroelectronics |
9 / 15 page Figure 19 : Driver for Solenoids up to 3A. Some care must be taken to ensure that the collec- tors are placed close together to avoid different cur- rent partitioning at turn-off. We suggest to put in parallel channel 1 and 4 and channel 2 and 3 as shown in figure 19 for the similar electrical characteristics of the logic section (turn-on and turn-off delay time) and the power stages (col- lector saturation voltage, free-wheeling diode for- ward voltage). APPLICATION INFORMATION When inductive loads are driven by L6221C/CD, a zener diode in series with the integral free-wheeling diodes increases the voltage across which energy stored in the load is discharged and therefore speeds the current decay (fig. 18). The zener has to be chosen in such a way that VCLAMP is limited to 60V taking into account the zener’s voltage changes due to: spread on VZ, tem- perature changes, and the voltage drop due to oh- mic resistance. Moreover, the instantaneous power must be limited in order to avoid the reverse second breakdown. Figure 18. L6221C 9/15 |
Número de pieza similar - L6221C_03 |
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Descripción similar - L6221C_03 |
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