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BD6088GUL
Technical Note
● DC/DC Explanation for operate
Start
DC/DC circuit operates when any LED turns ON. (DCDCFON=0)
When the start of theDC/DC circuit is done, it has the soft start function to prevent a rush current.
Force of VBAT and VIO is to go as follows.
DCDCMD=1 must be set in the fixed voltage mode and DCDCMD=DCDCFON=1 must be set when DCDC output takes
place regardless of LEDs.
VBAT
VIO
T VIOON=min 0.1ms
T VIOOFF=min 0.1ms
RESETB
T RSTB=min 0.1ms
T RST=min 0ms
EN (*)
T SO FT
VOUT
LEDcurrent
(*) An EN signal means the following in the upper figure.
EN = “MLEDEN” or “W ＊ EN”
(= LED The LED lighting control of a setup of connection VOUT)
But, as for Ta > T TSD (typ : 195° C), a protection function functions, and an EN signal doesn't become effective.
T SOFT changes by the capacitor connected to VOUT and inside OSC.
T SOFT is Typ 200 μ s (when the output capacitor of VOUT =1.0 μ F).
Over Voltage protection / Over Current protection
DC/DC circuit output (VOUT) is equipped with the over-voltage protection and the over current protection function.
A VOUT over-voltage detection voltage is about 6.0V(typ). (VOUT at the time of rise in a voltage)
A detection voltage has a hysteresis, and a detection release voltage is about 5.1V(typ).
And, when VOUT output short to ground, input current of the battery terminal is limited by an over current protection function.
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