MP3336 – DUAL-CHANNEL, FLASH LED DRIVER WITH I

MP3336 Rev.1.01

www.MonolithicPower.com

14

5/16/2017

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Figure 9: Software and Edge Trigger Flash Mode

Torch Mode to Flash Mode

The MP3336 can switch to flash mode from

torch mode directly when STR goes from low to

high if STR_MOD = 1. After flash, the operation

functions the same way as in flash mode (see

Figure 10).

Setting Time

Figure 10: Torch Mode to Flash Mode

Assist Mode to Flash Mode

During assist light mode, the device can switch

to flash mode from assist mode directly when

STR goes from low to high if STR_MOD = 1.

After flash, the operation functions the same

way as in flash mode (see Figure 11).

Setting Time

Figure 11: Assist Mode to Flash Mode

5V DC Output Mode

If 5V_MOD is set to 1, the device can work in a

fixed 5V output mode, and the control loop is

taken over by the voltage loop (see Figure 12).

The LED current sources can still output a

current if the mode conditions are met as

described above. Care must be taken to ensure

that the thermal condition is normal, since 5V

directly powers the LED. It is recommend to set

LED1/2_EN to 0 during 5V mode.

Figure 12: 5V DC Mode

Maximum Switching Frequency Setting

The maximum switching frequency can be

selected by the SW_FS bits when working in

boost mode. 1 /2 /3 /4MHz can be selected to

optimize efficiency.