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CAT4139
V OUT
Open LED Protection
In the event of an “Open LED” fault condition, the
CAT4139 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
V IN
L
22 m H
Schottky 40 V
(Central CMSH05 ? 4)
D
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
C1
4.7 m F
VIN
SW
C2
1 m F
rating of 40 V. There is no need to use an external zener diode
CAT4139
between VOUT and the FB pin. A 35 V rated C2 capacitor
is required to prevent any overvoltage damage in the open
LED condition.
OFF ON
SHDN
GND
FB
R1
15 W
Figure 18. Open LED Protection Circuit
Figure 19. Open LED Disconnect and Reconnect
2.5
35
Figure 20. Open LED Disconnect
30
2.0
25
1.5
20
1.0
3.0
3.5
4.0
4.5
5.0
5.5
15
3.0
3.5
4.0
4.5
5.0
5.5
INPUT VOLTAGE (V)
Figure 21. Open LED Supply Current
http://onsemi.com
9
INPUT VOLTAGE (V)
Figure 22. Open LED Output Voltage
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