BD6086GU_11 ROHM [Rohm], BD6086GU_11 Datasheet - Page 73

• Manufacturer Part Number: BD6086GU_11
• Description: 13LEDs ALC* Flash and Illumination
• Manufacturer: ROHM [Rohm]

● Description of DC/DC Operations
© 2011 ROHM Co., Ltd. All rights reserved.
www.rohm.com
BD6086GU
Activation
Overvoltage protection/Overcurrent protection
The DC/DC circuit is activated when any LED is subject to lighting control (DCDCFON=0).
(However, this is true only when the output (VOUT) of the DC/DC circuit is set as a LED connection destination.) A soft
start function is available to prevent the rush current at DC/DC circuit activation.
Note that voltage should apply to both VBAT and VIO as follows:
DCDCMD=1 must be set in the fixed voltage mode and DCDCMD=DCDCFON
The DC/DC circuit output (VOUT) is provided with an overvoltage protection function and an overcurrent protection function.
VOUT overvoltage detection voltage: approx. 6.0V (during a VOUT voltage rise)
A detection voltage has a hysteresis and its detection cancel voltage is approx. 5.75V (reference design value). In addition,
when the VOUT output is short-circuited to GND, the leak current is suppressed via the overcurrent protection function.
=1 must be set when DCDC output takes place regardless of LEDs.
But, as for Ta > T
T
T
(*) An EN signal means the following in the upper figure.
SOFT
SOFT
changes by the capacitor connected to VOUT and inside OSC.
is Typ 200μs (when the output capacitor of VOUT =1.0μF).
EN = “MLEDEN” or “W ＊ EN” or “RGB ＊ EN” or “RGB ＊ OS”
(= LED The LED lighting control of a setup of connection VOUT)
VBAT
VIO
RESETB
EN (*)
VOUT
LED 電 流
TSD
(typ : 195° C), a protection function functions, and an EN signal doesn't become effective.
T
VIOON=min 0.1ms
T
RSTB=min 0.1ms
T
SOFT
73/80
T
T
RST=min 0ms
VIOOFF=min 0.1ms
Technical Note
2011.04 - Rev.A