CAT4201 Datasheet, PDF (6/15 Pages) Catalyst Semiconductor – 350mA High Efficiency Step Down LED Driver

CAT4201
Typical Operation Characteristics
V_IN = 13V, I_LED = 300mA, L = 22μH, C₁= 4.7μF, C₂ = 10μF, T_AMB = 25°C unless otherwise specified
RSET Transient Response
Line Transient Response (10V to 13V)
External Component Selection
Table 1 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.
LED current
(mA)
≥150
< 150
1 LED
L inductor
(µH)
C2 Capacitor
(µF)
10
2.2
22
4.7
33
4.7
47
10
2 LEDs
L inductor
(µH)
C2 Capacitor
(µF)
22
4.7
47
2.2
Table 1. External Component Selection
Note: Larger C2 capacitor values allow to reduce further the LED ripple current if needed.
Doc. No. MD-5025 Rev. D
6
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice