APW7061
Typical Characteristics (Cont.)
Reference Voltage vs. Junction Temperature
0.8
0.798
0.796
0.794
0.792
0.79
-40 -20
0
20 40 60 80 100 120
Junction Temperature (°C)
Application Information
least 1.3 times higher than the maximum input voltage.
The maximum RMS current rating requirement is
approximately IOUT/2 , where IOUT is the load current.
During power up, the input capacitors have to handle
large amount of surge current. If tantalum capacitors
are used, make sure they are surge tested by the
manufactures. If in doubt, consult the capacitors
manufacturer.
Component Selection Guidelines
Output Capacitor Selection
The selection of COUT is determined by the required
effective series resistance (ESR) and voltage rating
rather than the actual capacitance requirement.
Therefore select high performance low ESR capacitors
that are intended for switching regulator applications.
In some applications, multiple capacitors have to be
paralled to achieve the desired ESR value. If tantalum
capacitors are used, make sure they are surge tested
by the manufactures. If in doubt, consult the capacitors
manufacturer.
For high frequency decoupling, a ceramic capacitor
between 0.1uF to 1uF can be connected between VCC
and ground pin.
Inductor Selection
Input Capacitor Selection
The inductance of the inductor is determined by the
output voltage requirement. The larger the inductance,
the lower the inductor’s current ripple. This will translate
The input capacitor is chosen based on the voltage
rating and the RMS current rating. For reliable
operation, select the capacitor voltage rating to be at
Copyright ã ANPECElectronicsCorp.
10
www.anpec.com.tw
Rev. A.7 - Nov., 2005
ANPEC [ ANPEC ELECTRONICS COROPRATION ]
