BP3126 Datasheet – PSR Constant Current LED Driver IC
High Precision PSR Constant Current LED Driver
BP3126 overview
The BP3126 is a High Precision PSR Constant Current LED Driver, supplied in a DIP 8 Pin Type package. The absolute maximum ratings table on this page lists the 9 limits from the manufacturer's datasheet that must not be exceeded. This page brings together the BP3126 pinout and maximum ratings, with the full datasheet PDF to preview below or download.
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.
Datasheet
BP3126 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
BP3126 pinout
| Pin | Name | Description |
|---|---|---|
| 1 | GND | Ground |
| 2 | FB | Feedback. This pin detects the output information from auxiliary winding. |
| 3 | VCC | Power supply |
| 4 | CS | Current sense. This pin connects a current sense resistor to GND to detect the primary current of transformer. |
| 5,6 | DRAIN | Internal high voltage MOSFET drain. |
| 7,8 | NC | No connection, must be floated |
Absolute maximum ratings
| Parameter | Symbol | Value | Unit |
|---|---|---|---|
| VCC pin input voltage | VCC | -0.3~20 | V |
| Feedback pin input voltage | FB | -0.3~6 | V |
| Internal MOSFET drain voltage | Drain | -0.3~650 | V |
| Current sense pin input voltage | CS | -0.3~6 | V |
| Power dissipation (note2) | PDMAX | 0.9 | W |
| Thermal resistance (Junction to Ambient) | θJA | 80 | ℃/W |
| Operating junction temperature | TJ | -40 to 150 | ℃ |
| Storage temperature range | TSTG | -55 to 150 | ℃ |
| ESD (note3) | 2 | KV |
BP3126 applications
- GU10/E27 LED bulb, spot light
- Other LED lighting
- Power Management
- Battery Chargers
- Voltage Regulation
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