MIC2145(2003) Просмотр технического описания (PDF) - Micrel

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MIC2145
(Rev.:2003)

High Efficiency 2.5W Boost Converter

Micrel 

MIC2145

Application Information

Pre-designed circuit information is at the end of this section.

Output Voltage

The output voltage of the regulator can be set between 2.4V

and 16V by connecting a resistor divider at the FB pin. The

resistor values are selected by the following equations:

R2= 1.08V • R1

VOUT − 1.08V

Micrel

A value of 1MΩ is recommended for R1 to minimize the

quiescent current when the part is off. Then, R2 can be solved

using the above equation. A feed-forward capacitor, CFF,

ranging from 5pF to 100pF can be used in parallel with R1 to

reduce the peak-to-peak output voltage ripple, which is

shown in Figures 4 and 5.

VOUT

AC Couple

(100mV/div)

VSW

(5V/div)

Time 20µs

Figure 4. Without Feed-Forward Capacitor

VOUT

AC Couple

(100mV/div)

VSW

(5V/div)

Time 4µs

Figure 5. With Feed-Forward Capacitor (100pF)

MIC2145

8

May 2003

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