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CAT4238TD-GT3 Datasheet(PDF) 8 Page - Catalyst Semiconductor |
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CAT4238TD-GT3 Datasheet(HTML) 8 Page - Catalyst Semiconductor |
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8 / 14 page  CAT4238 Doc. No. MD-5019 Rev. C 8 © Catalyst Semiconductor, Inc. Characteristics subject to change without notice APPLICATION INFORMATION External Component Selection Capacitors The CAT4238 only requires small ceramic capacitors of 4.7μF on the input and 0.22µF on the output. Under normal condition, a 4.7µF input capacitor is sufficient. For applications with higher output power, a larger input capacitor of 10µF may be appropriate. X5R and X7R capacitor types are ideal due to their stability across temperature range. Inductor A 47µH inductor is recommended for most of the CAT4238 applications. In cases where the efficiency is critical, inductances with lower series resistance are preferred. Inductors with current rating of 300mA or higher are recommended for most applications. Sumida CDC5D23B-470 47µH inductor has a rated current of 490mA and a series resistance (D.C.R.) of 420m Ω typical. Schottky Diode The current rating of the Schottky diode must exceed the peak current flowing through it. The Schottky diode performance is rated in terms of its forward voltage at a given current. In order to achieve the best efficiency, this forward voltage should be as low as possible. The response time is also critical since the driver is operating at 1MHz. Central Semiconductor Schottky diode CMDSH05-4 (500mA rated) is recommended for most applications. LED Current Setting The LED current is set by the external resistor R1 connected between the feedback pin (FB) and ground. The formula below gives the relationship between the resistor and the current: R1 = 0.3V/LED current LED current (mA) R1 ( Ω) 5 60 10 30 15 20 20 15 25 12 30 10 Table 1. Resistor R1 and LED current |
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