APW7061 Ver la hoja de datos (PDF) - Anpec Electronics

Número de pieza

componentes Descripción

Fabricante

APW7061

Synchronous Buck PWM Controller

Anpec Electronics 

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

Component Selection Guidelines

Output Capacitor Selection

The s election of COUT is determined by the required

effective series resist ance (ESR) and voltage rat ing

rat her t han t he ac tual c apacit anc e 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

manufac turer.

least 1.3 times higher than the maximum input voltage.

The maximum RMS c urrent 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 us ed, make s ure they are surge t est ed by t he

manufact ures . If in doubt, c onsult t he c apac it ors

manufac turer.

For high frequency decoupling, a ceramic capacitor

between 0.1uF to 1uF can be connected between VCC

and ground pin.

Input Capacitor Selection

Inductor Selection

The input capacitor is chos en based on the volt age

rat ing and the RMS c urrent rat ing. For reliable

operation, select the capacitor voltage rating to be at

The inductanc e of the inductor is determined by the

output voltage requirement. The larger the inductance,

the lower the inductor’s current ripple. This will translate

C opyright © ANPEC Electronics C orp.

10

Rev. A.7 - Nov., 2005

www.anpec.com.tw

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