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BP3126 PDF 데이터시트 ( Data , Function )

부품번호 BP3126 기능
기능 High Precision PSR Constant Current LED Driver
제조업체 BPS
로고 BPS 로고 


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BP3126 데이터시트, 핀배열, 회로
BP3126
High Precision PSR Constant Current LED Driver
Description
The BP3126 is a high precision primary-side feedback
and regulation controller for LED lighting, it operates
in constant current control mode and is designed to
work in inductor current discontinuous conduction
mode and extremely suitable for flyback convertor
under universal input, the output power of system
should be less than 24W.
The BP3126 integrates 650V power MOSFET. Since
adopting primary sense and feedback control
technology, the secondary sense and feedback circuit
is eliminated. The loop compensation components are
also removed while maintaining stability overall
operating conditions. The low component counts and
low BOM cost are realized.
Since using the proprietary high accurate current sense
method, the BP3126 realizes ±3% accuracy of LED
current along with excellent line regulation and load
regulation.
The BP3126 offers rich protection functions including
LED short circuit protection, LED open circuit
protection, die over-temperature protection, VCC over
voltage protection, VCC under voltage protection and
FB short circuit protection. All the protection features
are auto-recovery.
Typical Application
Features
Built-in 650V Power MOSFET
Constant current control without secondary sense
and feedback circuit.
±3% LED current accuracy
Ultra low operating current to improve efficiency
High resistance feedback resistor to improve
efficiency
Universal input voltage
LED short and open circuit protection
VCC under-voltage protection
Feedback loop short circuit protection
Current sense resistor open circuit protection
Over temperature protection
No external loop compensation component
required
Available in DIP-8 package
Applications
GU10/E27 LED bulb, spot light
Other LED lighting
NP NS
AC
BP3126_EN_DS_Rev.1.0
BP3126
FB
VCC
CS
GND
NC
NC
DRAIN
DRAIN
NAUX
Figure 1. Typical application circuit for BP3126
www.bpsemi.com
Bright Power Semiconductor Co. Confidential Customer Use Only
1




BP3126 pdf, 반도체, 판매, 대치품
BP3126
High Precision PSR Constant Current LED Driver
Electrical Characteristics(Notes 4,5) (Unless otherwise specified, VCC=12V and TA =25 )
Symbol
Parameter
Supply Voltage Section
VCC-th
Turn on threshold voltage
VUVLO
VOVP
VCC_clamp
Turn of threshold voltage
VCC over voltage
protection level
Zener diode clamped
voltage
Current Sense Section
VCS-th
TLEB
Threshold voltage for
peak current limit
Leading edge blanking
time for current sense
TDELAY
Switch off debounce time
Operation Current Section
IST Start up current
IOP Operating current
Feedback Section
VFB
TDemag_Min
ΔVCS/ΔIFBUP
FB voltage sense level
Minimum
demagnetization time
Line compensation ratio
Maximum Duty Cycle
DMAX
Maximum duty cycle
Over Temperature Protection
TSD
TSD-HYS
Thermal shutdown
threshold
Thermal shutdown
hysteresis
Conditions
VCC rising
ICC=10mA
VCC= VCC-th- 1V
FOP=40kHz
(note 6)
Min. Typ. Max. Units
13 14 15
6.5
16
19
V
V
V
V
490 500 510
500
200
mV
nS
nS
25 50
1.5
uA
mA
1V
4 uS
1.1 mV/uA
42 %
150
20
BP3126_EN_DS_Rev.1.0
www.bpsemi.com
Bright Power Semiconductor Co. Confidential Customer Use Only
4

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BP3126 전자부품, 판매, 대치품
Internal Block Diagram
BP3126
High Precision PSR Constant Current LED Driver
VCC
6.5V 14V
FB
FB SCP
OVP
FB Sense
DRAIN
UVLO
Reset
OTP
CC & Logic
Control
MOSFET
Gate
Driver
LEB
+ Current Sense
-
500mV
CS
GND
Figure 3. BP3126 Internal Block Diagram
Function Description
The BP3126 is a high performance power switch
specially designed for LED lighting, it uses the
patent constant current control technology of BPS.
The BP3126 integrates a 650V power MOSFET. 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
The start-up current in BP3126 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 BP3126 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 BP3126,
the CS is connected to the current sense comparator,
and the voltage on CS will be compared with the
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 current in LED can be calculated by the
equation:
BP3126_EN_DS_Rev.1.0
www.bpsemi.com
Bright Power Semiconductor Co. Confidential Customer Use Only
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