YB1506 Datasheet, PDF (6/10 Pages) YOBON TECHNOLOGIES,INC. – Step-up DC-DC Converter , White LED Driver

YB1506
Step-up DC-DC Converter , White LED Driver
Diode selection
effect input voltage ripple of the IC. For
To maintain high efficiency, the average ^{additional input voltage filtering, a}
current rating of the schottky diode should ^{100nF bypass capacitor can be placed}
be large than the peak inductor current, IPK. ^{in parallel with Cin to shunt any high}
Schottky diode with a low forward drop and ^{frequency noise to ground. The output}
fast switching speeds are ideal for increase ^{capacitor, Cout, should also be placed}
efficiency in portable application. Choose a ^{close to the IC. Any copper trace}
reverse breakdown of the schottky diode ^{connections for the Cout capacitor can}
large than the output voltage.
increase the series resistance,
which directly effect output voltage
Capacitor selection
ripple. The feedback network, resister
R2 should be kept close to the FB pin to
minimize copper trace connections that
Choose low ESR capacitors for the output to _{can inject noise into the system. The}
minimize output voltage ripple. Multilayer _{ground connection for the feedback}
capacitors are a good choice for this as well. _{resistor network should connect directly}
A 4.7uF capacitor is sufficient for most _{to an analog ground plane. The analog}
applications. For additional bypassing, a _{ground plane should tie directly to the}
100nF ceramic capacitor can be used to _{GND pin. If no analog ground plane is}
shunt high frequency ripple on the input.
available, the ground connection for the
feedback network should tie directly to
Layout consideration
the GND pin. Trace connections made
The input bypass capacitor Cin, as shown in ^{to the inductor and schottky diode}
Figure 1, must be placed close to the IC. ^{should be minimized to reduce power}
This will reduce copper trace resistance ^{dissipation and increase overall}
which
efficiency.
Figure 4j 20V Application
YB1506 MRev1.1
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