Epson LX-86TM Especificações descarregar pdf (Página 135)

REV.-A

A.1.4 494 Regulator IC

The 494 regulator

is described in Figures A-10 and A-1 1 and Table A-7.

(

TL&9SONLV

)

~<iEziq

OUTPU1

, CONTROL ,

c0N7R0L

DEAD

➤

CONTROL

Cnnw

annl?lcn

v<,

NONINVER1lNG

INPUT

INVE~J;tJf

(?EF

NONINVE~;;;:

GND

1NvERW4;

6 ----

FEE08ACR

L495 ONLY)

NON

INV

~—

r+:;

INV

FEED OEAO C T

RT GNO Cl

INPUT BACK TIME

INPuT

CONTROL

Fig. ‘A”-10. 494

Pin and Block Diagrams

Table A-7. 494

Port Functions

pin No.

Signal

Description

Ill

NON INV

Non.

Inv.

Input of error amplifier for output voltage detection.

INV

Inv.

Input of error amplifier

foroutput

voltage detection.

FEEDBACK

Feedback for phase correction.

4 CONTROL

Controls transistor OFF time.

Capacitor for oscillation frequency adjustment.

Resistor for oscillation frequency adjustment.

GND

Ground

Transistor collector for pulse amplification.

Transistor emitter for pulse amplification.

Transistor collector for pulse amplification.

12 Vcc

Power

(

OUTPUT CONTROL

Selection of parallel or push-pull.

REF

OUT

●

1-5V reference voltage

INV

Inv.

Input of error amplifier for output current detection.

NON

INV

Non.

Inv.

Input of error amplifier for output current detection.

A-1 O

1 2 ... 130 131 132 133 134 135 136 137 138 139 140 141 142

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