BP3106 データシートの表示（PDF） - Bright Power Semiconductor
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BP3106 Datasheet PDF : 9 Pages
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Internal Block Diagram
BP3106
High Precision PSR Constant Current LED Driver
VCC
6.5V 14V
FB
FB SCP
OVP
FB Sense
UVLO
OTP
Reset
CC & Logic
Control
Gate
Driver
GATE
LEB
+ Current Sense
CS
-
500mV
GND
Function Description
Figure 3. BP3106 Internal Block Diagram
the CS is connected to the current sense comparator,
and the voltage on CS will be compared with the
The BP3106 is a high performance power switch
specially designed for LED lighting, it uses the
patent constant current control technology of BPS.
The accurate LED current can be realized without
opto-coupler and TL431 feedback circuit while
minimizing the external component count, lowering
the total bill of material cost.
Start Up
internal 500mV reference voltage, the MOSFET will
be switched off when the voltage on CS reaches the
threshold. The output of the comparator also includes
a 500nS leading edge blanking time
The primary peak current is given by:
I P_PK
500 (mA)
RCS
The start-up current in BP3106 is designed to as low
as 25uA. The VCC capacitor will be charged through
the start-up resistor when the system is powered on,
once the voltage on VCC reaches the start-up
threshold, the BP3106 will start to operate, and then
the VCC is supplied by the auxiliary winding.
Constant Current Control
Cycle-by-Cycle current sense is offered in BP3106,
The current in LED can be calculated by the
equation:
I OUT
I P_PK
4
NP
NS
Where,
NP: primary winding turns of transformer
NS: secondary winding turns of transformer
IP_PK: peak current in MOSFET
BP3106_EN_DS_Rev.1.2
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