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BP3125

High Precision PSR Constant Current LED Driver

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BP3125

High Precision PSR Constant Current LED Driver

Description

The BP3125 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 12W.

The BP3125 integrates 600V 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 BP3125 realizes ±3% accuracy of LED

current along with excellent line regulation and load

regulation.

The BP3125 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 600V 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

BP3125

FB

VCC

CS

GND

NC

NC

DRAIN

DRAIN

NAUX

Figure 1. Typical application circuit for BP3125

BP3125_EN_DS_Rev.1.0

www.bpsemi.com

1

Bright Power Semiconductor Co. Confidential – Customer Use Only

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