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PT5540 Datasheet(PDF) 6 Page - Texas Instruments |
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PT5540 Datasheet(HTML) 6 Page - Texas Instruments |
6 / 8 page For technical support and more information, see inside back cover or visit www.ti.com Application Notes continued Fault Protection Unlike a “Buck” or step-down regulator it is not possible to provide a boost regulator with short-circuit protection. As revealed in the block diagram of Figure 1-1, inhibiting the MOSFET switching action only disables the regulator’s boost function. Therefore under a severe output impedance fault the control circuit cannot disconnect the output from the input source. To prevent an output over-current or short-circuit fault from propagating to the input bus, a fuse or equivalent over-current protection is recommended at the input of the module. Whatever form of protection is selected, it is important to note that the impedance and/or voltage drop of the series element will add to the regulator’s minimum input voltage requirements. Power up may also be affected. The combination of an input surge current with an im- pedance in series with the regulator input may cause the input voltage to momentarily dip back below the UVLO threshold. Ensure that the fuse rating or input current limit threshold are designed with a generous margin. PT5540 Series |
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