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W-6139TD-GT データシート(PDF) 9 Page - Copal Electronics

部品番号 W-6139TD-GT
部品情報  22 V High Current Boost
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メーカー  COPAL [Copal Electronics]
ホームページ  http://www.nidec-copal-electronics.com/e
Logo COPAL - Copal Electronics

W-6139TD-GT データシート(HTML) 9 Page - Copal Electronics

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W-6139
9
Open LED Protection
In the event of an “Open LED” fault condition, the
W-6139 will continue to boost the output voltage with
maximum power until the output voltage reaches
approximately 24 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 6 mW (about 1.6 mA input current with a 3.6 V
supply). The SW pin clamps at a voltage below its maximum
rating of 40 V. There is no need to use an external zener diode
between VOUT and the FB pin. A 35 V rated C2 capacitor
is required to prevent any overvoltage damage in the open
LED condition.
Figure 18. Open LED Protection Circuit
VIN
W-6139
L
Schottky 40 V
(Central CMSH05 4)
D
4.7 F
C1
1 F
C2
R1
15
FB
SW
GND
ON
22 H
OFF
VIN
VOUT
SHDN
Figure 19. Open LED Disconnect and Reconnect
Figure 20. Open LED Disconnect
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