DS3988 datasheet(10/23 Pages) MAXIM

Teilenummer	DS3988

Bauteilbeschribung	8-Channel Cold-Cathode Fluorescent Lamp Controller

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Hersteller	MAXIM [Maxim Integrated Products]

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8-Channel Cold-Cathode

Fluorescent Lamp Controller

10

____________________________________________________________________

Channel Phasing

The lamp-frequency MOSFET gate turn-on times are

equally phased among the eight channels during the

burst period. This reduces the inrush current that would

result from all lamps switching simultaneously, and

hence eases the design requirements for the DC sup-

ply. Figure 2 details how the eight channels are

phased. Note that it is the lamp-frequency signals that

are phased, NOT the DPWM signals.

Lamp Dimming Control (DPWM)

The DS3988 uses a digital pulse-width modulated

(DPWM) signal (22.5Hz to 440Hz) to provide efficient

and precise lamp dimming. During the high period of

the DPWM cycle, the lamps are driven at the selected

lamp frequency (40kHz to 80kHz) as shown in Figure 6.

This part of the cycle is called the “burst” period

because of the lamp frequency burst that occurs dur-

ing this time. During the low period of the DPWM cycle,

the controller disables the MOSFET gate drivers so the

lamps are not driven. This causes the current to stop

flowing in the lamps, but the time is short enough to keep

the lamps from de-ionizing. Dimming is increased/

decreased by adjusting (i.e., modulating) the duty cycle

of the DPWM signal.

The DS3988 can generate its own DPWM signal internally

(set DPSS = 0 in CR1), which can then be sourced to

other DS3988s if required, or the DPWM signal can be

supplied from an external source (set DPSS = 1 in CR1).

12

3

4

5

6

7

8

2

3

4567

8

1

23

4

5

6

7

8

VARIABLE

MOSFET

GATE DUTY

CYCLE

1

8

GA1

CHANNEL

SEQUENCE

GB1

GA2

GB2

GA3

GB3

GA4

GB4

GA5

GB5

GA6

GB6

GA7

GB7

GA8

GB8

MOSFET GATE-

DRIVE SIGNALS AT

LAMP FREQUENCY

DIMMING CLOCK (DPWM)

FREQUENCY

Figure 2. Channel Phasing Detail

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