Document
BP3123
High Precision PSR Constant Current LED Driver
Description
The BP3123 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 especially suitable for flyback convertor under universal input. The output power of system is recommended to less than 5W.
The BP3123 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. It uses patent pending source driver architecture and demagnetization sensing technology, the operating current is very low, and it doesn’t need the auxiliary winding for sensing the output current and supplying the chip. The low component counts and small system size are realized.
Since using the proprietary high accurate current sense method, the BP3123 realizes ±5% accuracy of LED current along with excellent line and load regulation.
The BP3123 offers rich protection functions including LED open/short circuit protection, CS resistor short circuit protection, over-temperature protection, VCC under voltage protection.
Typical Application
Features
Built-in 650V Power MOSFET Constant current control without secondary sense
and feedback circuit. No Auxiliary winding for sensing and supplying Ultra low operating current to improve efficiency Universal input voltage ±5% LED current accuracy LED short and open circuit protection CS resistor short circuit protection VCC under-voltage protection Over temperature protection Available in SOP-8 package
Applications
GU10/E27 LED bulb, spot light Other LED lighting
NP NS
AC
BP3123
4 OUT 3 VCC 1 CS 2 GND
NC 8 NC 7 DRAIN 6 DRAIN 5
BP3123_DS_Rev.1.0
Figure 1. Typical application circuit for BP3123
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BP3123
High Precision PSR Constant Current LED Driver
Ordering Information
Part Number
Package
BP3123
SOP8
Operating Temperature
-40℃ to 105℃
Package Method
Tape 2,500 Piece/Roll
Marking
BP3123 XXXXXY
WXYY
Pin Configuration and Marking Information
CS GND VCC OUT
BP3123
XXXXXY WXYY
NC NC DRAIN DRAIN
XXXXXY: Lot Code W: Sign X: Year YY: Week
Pin Definition
Pin No.
Name
1 CS
2 GND 3 VCC 4 OUT 5,6 DRAIN 7,8 NC
Figure 2. Pin configuration
Description Current sense. This pin connects a current sense resistor to GND to detect the primary current of transformer. Ground Power supply Internal high voltage MOSFET Source Internal high voltage MOSFET Drain No connection, must be floated
BP3123_DS_Rev.1.0
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BP3123
High Precision PSR Constant Current LED Driver
Absolute Maximum Ratings (note1)
Symbol
Parameters
Range
Units
ICC_max VCC pin maximum sink current
5 mA
DRAIN Internal HV MOSFET drain voltage
-0.3~650
V
CS Current sense pin input voltage
-0.3~6
V
OUT Internal HV MOSFET Source voltage
-0.3~18
V
PDMAX θJA
Power dissipation (note2) Thermal resistance (Junction to Ambient)
0.45 W 145 ℃/W
TJ Operating junction temperature
-40 to 150
℃
TSTG Storage temperature range
-55 to 150
℃
ESD (note3)
2 KV
Note 1: Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. Under “recommended operating conditions” the device operation is assured, but some particular parameter may not be achieved. The electrical characteristics table defines the operation range of the device, the electrical characteristics is assured on DC and AC voltage by test program. For the parameters without minimum and maximum value in the EC table, the typical value defines the operation range, the accuracy is not guaranteed by spec. Note 2: The maximum power dissipation decrease if temperature rise, it is decided by TJMAX, θJA, and environment temperature (TA). The maximum power dissipation is the lower one between PDMAX = (TJMAX - TA)/ θJA and the number listed in the maximum table. Note 3: Human Body mode, 100pF capacitor discharge on 1.5KΩ resistor
Recommended Operation Conditions
Symbol POUT1 POUT2 FOP
Parameter Output power (input voltage 230V±15%) Output power (input voltage 85V~265V)
System operating frequency
Range <6 <5 50
Unit W W KHz
BP3123_DS_Rev.1.0
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BP3123
High Precision PSR Constant Current LED Driver
Electrical Characteristics (Notes 4, 5) (Unless otherwise specified, VCC=14V and TA =25 ℃)
Symbol
Parameter
Conditions
Min. Typ. Max. Units
Supply Voltage Section
VCC_Clamp VCC_ON V CC_UVLO
VCC clamp voltage Turn on threshold voltage Turn off threshold voltage
1mA VCC rising VCC falling
15 17 V 13.8 V
9V
IST
VCC startup current
VCC= VCC_ON - 1V
60 100 uA
IOP
VC.