Datasheet CAT4201 (ON Semiconductor) - 6

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CAT4201 TYPICAL OPERATION CHARACTERISTICS
(VIN = 13 V, ILED = 300 mA, L = 22 mH, C1 = 4.7 mF, C2 = 10 mF, TAMB = 25°C unless otherwise specified)
Figure 20. RSET Transient Response Figure 21. Line Transient Response (10 V to 13 V) External Component Selection
Table 4 provides the recommended external components L and C2 that offer the best performance relative to the LED current accuracy, LED ripple current, switching frequency and component size.
Table 4. EXTERNAL COMPONENT SELECTION 1 LED 2 LEDs LED Current (mA) L Inductor (mH) C2 Capacitor (mF) L Inductor (mH) C2 Capacitor (mF)
≥150 22 4.7 22 4.7 < 150 33 4.7 47 2.2 47 10 NOTE: Larger C2 capacitor values allow to reduce further the LED ripple current if needed.
Table 5. INDUCTOR SELECTION DEPENDING ON VBAT SUPPLY VOLTAGE VBAT Supply Voltage (V) Minimum Inductor L (mH)
< 26 22 ≥ 26 33
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