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W-6137TD-GT データシート(PDF) 13 Page - Copal Electronics

部品番号 W-6137TD-GT
部品情報  CMOS Boost Converter
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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-6137TD-GT データシート(HTML) 13 Page - Copal Electronics

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W-6137
13
Open LED Protection
In the event of an “Open LED” fault condition, the
W-6137 will continue to boost the output voltage with
maximum power until the output voltage reaches
approximately 24 V. Once the output exceeds this level,
internal circuitry immediately places the device into a very
low power mode where the total input power consumed is
less than 10 mW.
In low power mode, the input supply current will typically
drop to 2 mA. An internal clamping circuit will limit the
subsequent output voltage to approximately 29 V. This
operating mode eliminates the need for any external
protection zener diode. This protection scheme also fully
protects the device against any malfunction in the external
Schottky diode (open-circuit).
Figure 31. Open LED Protection
Figure 32. Open LED Power up Waveforms
Figure 33. Open LED Supply Current vs. VIN
VIN
W-6137
L
(Central CMDSH2 3)
D
1 F
C1
0.22 F
C2
R1
15
FB
SW
GND
ON
22 H
OFF
INPUT VOLTAGE (V)
5.0
4.5
3.5
3.0
2.5
1.0
1.5
2.0
2.5
4.0
VFB = 300 mV
SHDN
VIN
VOUT


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