CAT4237 datasheet(9/13 Pages) CATALYST

tên linh kiện	CAT4237

Giải thích chi tiết về linh kiện	High Voltage CMOS Boost White LED Driver

PDF	13 Pages

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9 / 13 page

CAT4237

9 of 13

Doc. No. 5013, Rev. A

Characteristics subject to change without notice

OPEN LED PROTECTION

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

the CAT4237 will continue to boost the output

voltage with maximum power until the output

voltage reaches approximately 35V. 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 4mW (about 1mA 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

Open LED Supply Current vs. VIN

without Zener

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

INPUT VOLTAGE [V]

Open LED Output Voltage vs. VIN

without Zener

2.5

3.0

3.5

4.0

4.5

5.0

INPUT VOLTAGE [V]

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