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CAT4238
Open LED Protection
In the event of an “Open LED” fault condition, the
CAT4238 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
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
5.0
4.0
3.0
2.0
1.0
LED condition.
V IN
C 1
L
47 m H
Schottky 100 V
(Central CMSH1 ? 100)
V OUT
C 2
0
3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
Figure 20. Open LED Supply Current vs. V IN without
Zener
4.7 m F
VIN
SW
0.22 m F
55
CAT4238
OFF ON
SHDN
GND
FB
V FB = 300 mV
R 1
15 W
50
45
Figure 18. Open LED Protection without Zener
40
35
3.0
3.5
4.0
4.5
5.0
5.5
INPUT VOLTAGE (V)
Figure 21. Open LED Output Voltage vs. V IN without
Zener
2 m s/div
Figure 19. Open LED Switching Waveforms without
Zener
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