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NCP5050
3000
2500
overall efficiency will improve. Some recommended
inductors include but are not limited to:
TDK VLF5012A ? 2R2M1R5
2000
1500
1000
500
Switch Current Limit
Setup by R PCA
Operating Inductor
Peak Current
TDK VLF5014A ? 2R7M1R5
TDK RLF7030T ? 3R3M4R1
Switch Current Limit
This safety feature is clamping the maximum current
allowed in the inductor according to external RPCA resistor,
which is connected between PCA input and the ground. This
allows the user to reduce the peak current being drawn
0
50 150 250 350 450
I out (mA)
Figure 21. Inductor Peak Currents Vs. I OUT (mA) for
3 LEDs, (10.5 V @ 350 mA)
3000
2500
according to the application’s specific requirements. The
I PEAK maximum is 3.0 A, resulting in a minimum resistor
value of 2.8 k W . After selecting the switch current limit in
section above, please refer to Table 1 or Figure 24 below to
choose R PCA value versus I PEAK_MAX accordingly. By
limiting the peak current to the needs of the application, the
inductor sizing can be scaled appropriately to the specific
requirements. This allows the PCB footprint to be
minimized.
Table 1. I PEAK_MAX Versus R PCA
2000
1500
1000
500
Switch Current Limit
Setup by R PCA
Operating Inductor
Peak Current
I PEAK_MAX (A)
3.0
2.5
2.0
1.5
1.0
R PCA (k W 1%)
2.8
3.4
4.12
5.76
9.09
0
50 150 250 350
I out (mA)
Figure 22. Inductor Peak Currents Vs. I OUT (mA) for
4 LEDs, (14 V @ 350 mA)
3000
2500
3500
3000
2500
2000
1500
1000
2000
1500
1000
Switch Current Limit
Setup by R PCA
Operating Inductor
500
0
1.0
10
R PCA (k W )
100
500
Peak Current
Figure 24. I PEAK_MAX vs. R PCA
Input and Output Capacitors Selection
0
25 75 125 175 225
I out (mA)
Figure 23. Inductor Peak Currents Vs. I OUT (mA) for 5
LEDs, (17.5 V @ 350 mA)
Finally, an acceptable DCR must be selected regarding
C OUT stores energy during the T OFF phase and sustains
the load during the T ON phase. In order ensure the loop
stability and minimize the output ripple, at least 1.0 m F low
ESR multilayer ceramic capacitor type X5R is
recommended. Increasing the C OUT capacitor improved the
output voltage ripple.
losses in the coil and must be lower than 100 m W to limit
excessive voltage drop. In addition, as DCR is reduced,
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