BP3309 PDF

The BP is a high precision primary-side regulation isolated flyback controller with single-stage Active PFC, specially designed for offline constant current LED lighting. Using proprietary current sensing scheme, the controller can precisely control the LED current without secondary side sense and feedback circuit including opto-coupler. It uses source driver architecture and patent pending internal charging circuit for low primary side switching loss, ultra fast VCC startup and LED turn on. The BP uses patent compensation method to achieve excellent line regul ation, and it still can be tuned externally for flexibility. The controller also has outstanding load regulation for driving wide range of LED numbers. The BP offers rich protection functions to improve the system reliability, including LED short circuit protection, LED open circuit protection, V CC over voltage protection, V CC under voltage protection, CS resistor short circuit protection, CS resistor open circuit protection, cycle-by-cycle current limit and die over-temperature protection.

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The BP is a high precision primary-side. Active PFC, specially designed for offline constant. The controller with on-chip PFC. Using proprietary current sensing. It uses source driver. The BP uses patent compensation method to. The controller also. The BP offers rich protection functions to. CS resistor short circuit protection, CS resistor open. All the protection. Typical Application. No Opto-Coupler required. OUT 8. Figure 1. Typical application circuit for BP Bright Power Semiconductor Co.

Confidential — Customer Use Only. Ordering Information. Part Number. Package Method. Pin Configuration and Marking Information.

Figure 2. Pin configuration. X: Year. Pin Definition. Pin No. Current Sense pin. This pin connects a resistor to GND to sense the. Loop Compensation Node. This pin connects a capacitor to GND for. Factor and low THD. Line Voltage Sense Input pin. This pin connects to the middle of resistor. Feedback Voltage Input pin. This pin detects the output information. It is also used for line regulation.

Power Supply pin. Connect a bypass cap from this pin to GND. Startup Voltage Generator pin. Connect a bypass cap from this pin to. Connect to external high voltage power. Download BP Datasheet. Using proprietary current sensing scheme, the controller can precisely control the LED current without secondary side sense and feedback circuit including opto-coupler. It uses source driver architecture and patent pending internal charging circuit for low primary side switching loss, ultra fast V CC startup and LED turn on.

The BP uses patent compensation method to achieve excellent line regulation, and it still can be tuned externally for flexibility.

The controller also has outstanding load regulation for driving wide range of LED numbers. The BP offers rich protection functions to improve the system reliability, including LED short circuit protection, LED open circuit protection, V CC over voltage protection, V CC under voltage protection, CS resistor short circuit protection, CS resistor open circuit protection, cycle-by-cycle current limit and die over-temperature protection.

All the protection features are auto-recovery. Typical application circuit for BP www. Confidential — Customer Use Only 1. This pin connects a resistor to GND to sense the transformer primary side current. This pin connects to the middle of resistor divider from the rectified line voltage.

This pin detects the output information through the auxiliary winding. It is also used for line regulation compensation. Confidential — Customer Use Only 2.

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