ML4833 데이터 시트보기 (PDF) - Micro Linear Corporation

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ML4833

Electronic Dimming Ballast Controller

Micro Linear Corporation 

ML4833

CX

RX

RX/CX

9

6.8

INTERRUPT

8

1.25V

0.625

RSET

+

1.2/4.8 –

+

1.2/6.8 –

–

+

HEAT

DIMMING

LOCKOUT

R INHIBIT

Q

S

Figure 8. Lamp Preheat and Interrupt Timers

LFB OUT is ignored by the oscillator until CX reaches

6.8V threshold. The lamps are therefore driven to full

power and then dimmed. The CX pin is clamped to

about 7.5V.

A summary of the operating frequencies in the various

operating modes is shown below.

Operating Mode

Preheat

Dimming

Lock-out

Dimming

Control

Operating Frequency

[F(MAX) to F(MIN)]

2

F(MIN)

F(MIN) to F(MAX)

TYPICAL APPLICATIONS

Figure 10 shows a schematic for a dimming power-factor

corrected 60W ballast, designed to operate two F32T8

fluorescent lamps connected in series.

6.8

4.8

RX/CX

1.2

.65

0

HEAT

DIMMING

LOCKOUT

>1.25

INT

INHIBIT

Figure 9. Lamp Starting and Restart Timing

10

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