G5921 datasheet(7/9 Pages) GMT

7 / 9 page

Ver: 0.4 Preliminary

Feb 03, 2005

TEL: 886-3-5788833

http://www.gmt.com.tw

G5920/G5921

Global Mixed-mode Technology Inc.

Function Description

G5920/G5921 LED pins act as well matched current

source driving LED diode to ground. An EN pin is used

to turn on and turn off G5920/G5921.

When applying a lower frequency (less than 2kHz)

PWM waveform to EN pin, the average LED current

will be duty*20mA(typical). Refer to Fig.1

If the application is not suitable to apply such a low

frequency PWM dimming waveform, this EN pin can

be negatively pulsed to set continuous LED current.

When no negative pulse is input to EN pin (Code=0),

the internal register will latched to set the maximum

LED current, typically 20mA. Whenever input N nega-

tive pulses to the EN pin, it will get a LED current cor-

responding to Code N. In this manner, LED current will

changed from previous value to new value after the

last pulse for typical 80µs (TEOP). Please refer to Fig.2

EOP

OFF

20mA (Code=0)

EOP

ON duty

Fig.1 Turn ON to PWM dimming

LED

EOP

OFF

20mA (Code=0)

EOP

ON duty

Fig.1 Turn ON to PWM dimming

LED

EOP

LOW

HIGH

N negative pulses

OFF

Fig.2 Turn ON and config Code N

LED current corresponding to Code N

Code

LED

EOP

LOW

HIGH

N negative pulses

OFF

Fig.2 Turn ON and config Code N

LED current corresponding to Code N

Code

LED

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