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BD6062GU
Technical Note
It depends on battery or external components condition, internal power consumption will be large at flash action and there is
a possibility that it will over Power dissipation of IC.
BD6062GU can limit drive current on over power condition, and protect to over Power dissipation.
When this mode is enable, BD6062GU limit maximum current automatically as below.
Torch
Flash
Max200mA ?
Max800mA ?
Max200mA
400mA
3) Power Control
BD6062GU can be controlled the status of activation using Enable control resistor.
4) LED drive current (Torch Mode)
The LED current is decided by the voltage of RTORCH terminal. (Rtorch=1.0 ? )
ILED is given as follows,
ILED= I(Torch Current Driver)=VRTORCH / 1.0( ? )
VRTORCH =0.05V, Rtorch =1.0 ? , ILED=50mA : Itorch [1:0] = 00
VRTORCH =0.2V, Rtorch =1.0 ? , ILED=200mA : Itorch [1:0] = 11
VRTORCH is controlled 0.05V~0.2V by resistor setting.
5) LED drive current (Flash Mode)
The LED current is decided by the voltage of RFLASH terminal and RTORCH terminal.
(Rflash=0.12 ? , Rtorch=1.0 ? )
ILED is given as follows,
ILED= I(Flash Current Driver)+I(Torch Current Driver) =VRFLASH/0.12( ? )+VRTORCH / 1.0( ? )
VRFLASH=0.096V, Rflash =0.12 ? , Itorch[1:0]=11
VRTORCH=0.2V, Rtorch =1.0 ? , Iflash[1:0]=11
VRFLASH is controlled 0.048V~0.096V by resistor setting.
6) Basic function
i) Register control interface(3wired) mode (timer enable)
Torch
(Address : 00 (H), D[0])
Flash
ILED=200mA+800mA=1000mA
(Address : 00 (H), D[1])
t FLASH1
t FLASH2
I LED2
I LED
(0mA)
I LED1
ILED1 : Torch Current Driver
ILED2 : Forch Current Driver
tFLASH1,2 : Flash time is controlled by timer resistor setting.
Fig.29 3wired mode Torch and Flash Timing (Timer enable)
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? 2011 ROHM Co., Ltd. All rights reserved.
9/15
2011.05 - Rev.B
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