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CAT4240
Open LED Protection
L
In the event of an “Open LED” fault condition, the
CAT4240 will continue to boost the output voltage with
maximum power until the output voltage reaches
approximately 40 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
V L
13 V
C1
VIN
5V
Schottky 100 V
(Central CMSH1 ? 100)
VOUT
47 m H
C2
4.7 m F
1 m F
SW
VIN
CAT4240
rating of 60 V. There is no need to use an external zener diode
between Vout and the FB pin. A 50 V rated C 2 capacitor is
required to prevent any overvoltage damage in the open
LED condition.
ON OFF
SHDN
GND
FB
R1
3 W
Figure 18. Open LED Protection without Zener
5.0
4.0
60
55
3.0
50
2.0
1.0
VIN = 5 V
45
0
8
9
10
11
12
13
14
15
16
40
8
9
10
11
12
13
14
15
16
INDUCTOR VOLTAGE (V)
Figure 19. Open LED Supply Current vs. V IN without
Zener
Figure 21. Open LED Disconnect and Reconnect
INDUCTOR VOLTAGE (V)
Figure 20. Open LED Output Voltage vs. V IN without
Zener
Figure 22. Open LED Disconnect
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