LED6000PHR datasheet(22/49 Pages) STMICROELECTRONICS

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

MIN

DCR

LIM















LIM

ILIM





 20

LED6000PHR 数据表(PDF) 22 Page - STMicroelectronics

LED6000PHR 数据表(HTML) 22 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49

数据表下载