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AN4250 Datasheet(PDF) 9 Page - STMicroelectronics |
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AN4250 Datasheet(HTML) 9 Page - STMicroelectronics |
9 / 15 page DocID024230 Rev 1 9/15 AN4250 Fishbone diagram 15 4 Fishbone diagram In this section most common critical conditions, affecting the Power MOSFET mounted as switch on the Boost converter, are described. Besides, they are reported in a fishbone diagram. Causes linked to the application Short-circuit of the startup In the Boost topology above described, the “pre-charge” circuit has not been presented; this circuit works during the start-up phase when the output capacitor is not charged and the V IN is greater than V OUT . This condition forces the switch to absorb more current than the steady-state operation, therefore the switch could work with current exceeding the maximum ratings. Using the “pre-charge” circuit, the current doesn't flow through the switch since it flows through the diode of the “pre-charge” circuit until V IN > V OUT . Figure 8. Pre-charge circuit Choke dimensions Since coil saturation depends on the current flowing through it, if the coil is not dimensioned correctly, coil saturation can occur (the coil behaves as a simple short-circuit); a huge quantity of current can flow through the switch causing an overheating that, in some cases, causes the failure of the device. Losses during the switching If the MOSFET is not driven correctly, an overheating can occur. This phenomenon can cause the failure of the device. V1 V L1 L D1 D C1 C R1 R R2 R D2 D SWITCH AM17356v1 |
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