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

No. de pieza CAT4238TD-GT3
Descripción Electrónicos  High Efficiency 10 LED Boost Converter
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Fabricante Electrónico  ONSEMI [ON Semiconductor]
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CAT4238TD-GT3 Datasheet(HTML) 9 Page - ON Semiconductor

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CAT4238
© 2008 SCILLC. All rights reserved.
9
Doc. No. MD-5019 Rev. E
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
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
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]


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