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AS3648

Datasheet, Confidential - D e ta i l e d D e s c r i p t i o n

Load Balancing

To improve the efficiency of the AS3648 for LEDs with unmatched forward voltage and reduce the internal power dissi-

pation of the AS3648, set the bit load_balance_on=1. This bit can change the currents through the LEDs by up to +/-

15% (up to 115%/85% of set current between LED_OUT1 to LED_OUT2) to match the forward voltage of the LED bet-

ter as shown in Figure 23:

Figure 23. Load Balancing

Flash Strobe Timings

The flash timing are defined as follows:

1. Flash duration defined by register flash_timeout and flash is started immediately when this mode is selected by

the I

set strobe_on = 0, start the flash by setting out_on = 1

2. Flash duration defined by register flash_timeout and flash started with a rising edge on pin STROBE (see Fig-

ure 25):

set strobe_on = 1 and strobe_type = 0

3. Flash start and timing defined by the pin STROBE; the flash duration is limited by the timeout timer defined by

set strobe_on = 1 and strobe_type = 1

Figure 24. AS3648 flash duration defined by flash_timeout without using STROBE input

 









 







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