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LED6000 Datasheet(PDF) 22 Page - STMicroelectronics |
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LED6000 Datasheet(HTML) 22 Page - STMicroelectronics |
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22 / 49 page  Functional description LED6000 22/49 DocID027777 Rev 2 Assuming VF = 0.6 V the free-wheeling diode direct voltage, RDCR = 30 m inductor parasitic resistance, ILIM = IPK = 4 A the peak current limit, RON = 0.25 HS MOS resistance and TON,MIN = 120 ns minimum HS MOS on duration, the maximum FSW frequency which avoids the inductor current runaway in case of the output short-circuit and VIN = 61 V is 801 kHz. If the programmed switching frequency is higher than the above computed limit, an estimation of the inductor current in case of the output short-circuit fault is provided by Equation 5: Equation 5 The peak current limit threshold (ILIM) can be programmed in the range 0.85 A - 4.0 A by selecting the proper RILIM resistor, as suggested in Equation 6. Equation 6 IPK is the default LED6000 current limit in case of RILIM not mounted, as shown in Table 5 on page 8. Figure 14. Current limit and programming resistor DCR ON MIN ON SW DCR F IN ON SW LIM R R T F R V V T F I , 8 8 LIM PK ILIM I I k R 20 |
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