Epson LX-86TM Specifikace stáhnout pdf (Strana 38)

REV.-A

2.3.2.1 Operation Principles of Chopper Type Switching Regulator

The operating principle of the switching regulator is illustrated in Figures 2-6 and 2-7.

“

:fl,~

Fig. 2-6 Chopper Switching Regulator Circuit

V/I

Max

J+

Vi - VO

.tc

IPtD

+ IOt 1

c =

to =

Fig. 2-7 Voltage Waveforms

When switching transistor St is on, current Is is supplied to inductor L in proportion to time;

(vi –

Vo)

When energy has accumulated in the inductor L, current 10 is supplied to the load. When St is off, the

energy accumulated in L causes

Ip –

current ID to flow via diode D and to supply load current 10;

The longer the on-time of St, the more the output voltage increases, and the shorter the on-time of St,

the more the output voltage decreases. Theoretically, electric power efficiency is assumed to be 100%;

Output voltage Vo =

2-6

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Epson LX-86TM Specifikace Strana 38