CAT4238TD-GT3 datasheet(9/14 Pages) CATALYST

Part #	CAT4238TD-GT3

Description	High Efficiency 10 LED Boost Converter

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Manufacturer	CATALYST [Catalyst Semiconductor]

Direct Link	http://www.catalyst-semiconductor.com

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9 / 14 page

CAT4238

9

Doc. No. MD-5019 Rev. C

Characteristics subject to change without notice

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

Open LED Supply Current vs. VIN

without Zener

0.0

1.0

2.0

3.0

4.0

5.0

3.0

3.5

4.0

4.5

5.0

5.5

INPUT VOLTAGE [V]

Open LED Output Voltage vs. VIN

without Zener

35

40

45

50

55

3.0

3.5

4.0

4.5

5.0

5.5

INPUT VOLTAGE [V]

VIN

CAT4238

VIN

L

Schottky 100V

(Central CMSH1-100)

VOUT

R1

15Ω

VFB = 300mV

4.7µF

C1

0.22µF

C2

FB

SHDN

SW

GND

OFF ON

47µH

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CAT4238TD-GT3 Datasheet(PDF) 9 Page - Catalyst Semiconductor

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