Datasheet > CAT4238

CAT4238

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
CATALYST		转换器升压转换器
页数	文件大小	规格书
14页	280K
描述
High Efficiency 10 LED Boost Converter

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CAT4238 数据手册

CAT4238

APPLICATION INFORMATION

External Component Selection

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.

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.

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:

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

420mΩ typical.

R1 = 0.3V/LED current

LED current (mA)

R1 (Ω)

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

Table 1. Resistor R1 and LED current

Doc. No. 5019 Rev. A

Characteristics subject to change without notice

1...5 6 789 10 11...14

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