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

OPEN LED PROTECTION

In the event of an “Open LED” fault condition, the

CAT4238 will continue to boost the output voltage with

maximum power until the output voltage reaches

approximately 40V. Once the output exceeds this

level, the internal circuitry immediately places the

device into a very low power mode where the total

input power is limited to about 6mW (about 1.6mA

input current with a 3.6V supply). The SW pin clamps

at a voltage below its maximum rating of 60V. There is

no need to use an external zener diode between Vout

and the FB pin. A 50V rated C2 capacitor is required

to prevent any overvoltage damage in the open LED

condition.

Open LED Protection without Zener

Open LED Switching Waveforms

without Zener

Schottky 100V

(Central CMSH1-100)

V_OUT

VIN

47µH

4.7µF

0.22µF

VIN

CAT4238

SHDN FB

GND

_FB= 300mV

OFF ON

15Ω

Open LED Output Voltage vs. VIN

without Zener

Open LED Supply Current vs. VIN

without Zener

5.0

4.0

3.0

2.0

1.0

0.0

3.0

3.5

4.0

4.5

5.0

5.5

3.0

3.5

4.0

4.5

5.0

5.5

INPUT VOLTAGE [V]

Characteristics subject to change without notice

Doc. No. 5019 Rev. A

1...6 7 8910 11 12...14

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