ML4832 데이터 시트보기 (PDF) - Micro Linear Corporation

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ML4832

Electronic Dimming Ballast Controller

Micro Linear Corporation 

ML4832

FUNCTIONAL DESCRIPTION (Continued)

the lamp fails to strike or is out of socket. Typically this

time is set to be fairly long by choosing a large value

of RX.

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)

6.8

4.8

RX/CX

1.2

.65

0

HEAT

DIMMING

LOCKOUT

7.5

INT

INHIBIT

Figure 8. Lamp Starting and Restart Timing

10

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