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W-6237TD-G3 Arkusz danych(PDF) 9 Page - Copal Electronics

Numer części W-6237TD-G3
Szczegółowy opis  High Voltage CMOS Boost
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Producent  COPAL [Copal Electronics]
Strona internetowa  http://www.nidec-copal-electronics.com/e
Logo COPAL - Copal Electronics

W-6237TD-G3 Arkusz danych(HTML) 9 Page - Copal Electronics

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W-6237
9
Open LED Protection
In the event of an “Open LED” fault condition, the
W-6237 will continue to boost the output voltage with
maximum power until the output voltage reaches
approximately 35 V. 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 4 mW (about 1 mA input current with a 3.6 V supply).
The SW pin clamps at a voltage below its maximum rating
of 60 V. There is no need to use an external zener diode
between Vout and the FB pin. A 50 V rated C2 capacitor is
required to prevent any overvoltage damage in the open
LED condition.
Figure 21. Open LED Protection without Zener
VIN
W-6237
L
Schottky 100 V
(Central CMSH1 100)
R1
15
4.7 F
0.22 F
FB
SW
GND
OFF ON
33 H
VIN
C1
VOUT
SHDN
VFB = 300 mV
C2
Figure 22. Open LED Switching Waveforms without
Zener
10 sec/div
SW PIN
10 V/div
Figure 23. Open LED Supply Current vs. VIN without
Zener
INPUT VOLTAGE (V)
5.0
4.5
4.0
3.5
3.0
2.5
0
0.5
1.0
1.5
2.0
Figure 24. Open LED Output Voltage vs. VIN without
Zener
INPUT VOLTAGE (V)
5.0
4.5
4.0
3.5
3.0
2.5
30
35
40
45
50


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