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ZXLD1101
Open circuit protection
For applications where the LED chain can go
open-circuit a Zener diode can be connected across the
LED chain preventing over-voltage and possible
damage to the main switching transistor. The Zener
diodes should be selected by ensuring its voltage
rating is higher than the combined forward voltage of
the LED chain. Under open circuit conditions the
current in the Zener diode defines the output current
as:
Capacitor selection
A ceramic capacitor grounded close to the GND pin of
the package is recommended at the output of the
d e v i ce . S u r f a ce m o u n t t y p e s o f f e r t h e b e st
performance due to their lower inductance. A
minimum value of 0.22 F is advised, although higher
values will lower switching frequency and improve
efficiency especially at lower load currents. A higher
value will also minimise ripple when using the device
to provide an adjustable dc output current.
I Z =
V FB
R Z
A good quality, low ESR capacitor should also be used
for input decoupling, as the ESR of this capacitor is
effectively in series with the source impedance and
To limit battery drain in this fault condition the Zener
diode current should be less than 1mA.
lowers overall efficiency. This capacitor has to supply
the relatively high peak current to the coil and smooth
the current ripple on the input supply. A minimum
value of 1 F is acceptable if the input source is close to
the device, but higher values will improve performance
at lower input voltages, when the source impedance is
high. The input capacitor should be mounted as close
as possible to the IC.
For maximum stability over temperature, capacitors
with X7R dielectric are recommended, as these have a
much smaller temperature coefficient than other types.
A table of recommended manufacturers is provided
below:
Manufacturer
Murata
Taiyo Yuden
Kemet
AVX
Website
www.murata.com
www.t-yuden.com
www.kement.com
www.avxcorp.com
ISSUE 4 - JULY 2004
SEMICONDUCTORS
10
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