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AXBM2001 Datasheet(PDF) 11 Page - Zetex Semiconductors |
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AXBM2001 Datasheet(HTML) 11 Page - Zetex Semiconductors |
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11 / 14 page  12V Supply with Reverse Supply Protection This following circuit in Figure 17 is similar to that in Figure 15 except that it has the reverse polarity protection feature added. This is achieved with D3 providing protection to the ZXBM2001 and D4 providing protection to the motor windings. C5 is also added to smooth out the excessive supply disturbance as discussed in previous sections. Another point of note with this circuit is that the PWM frequency was set to run at 34kHz by making C1 the more readily available 100pF value. Running at this higher frequency has not been seen to be a problem with MOSFETs where the on and off switching is clean and thus gives minimal switching losses. 24V Supply with Reverse Supply Protection The final circuit example in Figure 18 is used to illustrate the supply provision for a 24 V application. Again MOSFETs are used with reverse supply protection incorporated. The ZXBM2001 takes its supply from the same protection diode as the windings, however, because C4 is large and the supply to the ZXBM2001 regulated by ZD3 and C3 the supply commutation ripple is not a problem. The higher voltage, 100V, Zetex ZXMN10N11G MOSFETs are used with 75V Zener active clamping. The circuit in Figure 18 has also been used for a motor design with an input supply of 48V. In this case higher voltage rating components were selected to withstand the higher winding avalanche voltages. USEFUL APPLICATION IDEAS Failsafe dual fan systems In high reliability systems there is a need to ensure the cooling scheme is also reliable. This is often achieved by the use of 2 fans that will ensure there is still a degree of cooling should one fan fail. An improvement to this is to run each of the two fans at half speed and in the event of a failure of one fan to speed up the remaining fan to full speed. Figure 19 illustrates such a system where two fans using the ZXBM2001 are connected together. AN 36 - 11 Applications Note AN36 Issue1 - JULY 2002 Figure 17 12V Supply with Reverse Supply Protection. Figure 18 24V motor with Reverse Polarity Protection. |
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