Part Number: BP9021

Function: High Precision PSR LED Constant Current Driver Chip

Package: SOP 8Pin

Manufacturer: Bright Power Semiconductor ( www.bpsemi.com )

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Description

The BP9021 is a high precision primary-side constant current LED driver chips. Chip inductor in discontinuous current mode for full range 85Vac ~ 265Vac input voltage, power 3W or less isolated flyback LED constant current power supply.

The chip integrated 650V power switch, primary-side feedback mode, no secondary feedback circuit, and without compensation circuitry, requires minimal external components to achieve excellent constant current characteristic. Patented drive and current detection method, the chip operating current is extremely low, no power transformer auxiliary winding detection and further reduce external components, greatly saving system cost and size.

Pinout

Features

1. Integrated 650V power MOSFET

2. PSR constant current control, without secondary feedback circuitry

3. Without detection and power transformer auxiliary winding

4. LED open-circuit voltage can be adjusted by external resistor

5. Chip ultra low operating current

 

BP9021 Datasheet PDF Download

 

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Part Number: OB3362HP

Function: 4 Channels High Performance LED Driver

Package: DIP, ESOP 16 Pin Type

Manufacturer: On-Bright Electronics

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OB3362FHP is Marking OB3362HP.

0B3362HP Datasheet

The OB3362FHP is a highly integrated and high performance LED driver that optimized for LCD backlight application. It integrates a boost driver and 4 channels of current balancer that optimized to drives multi LED arrays, and thus provides a high performance LED backlight solution with minimized BOM count.

The 0B3362FHP contains a PWM boost driver which uses current mode control and fixed frequency operation. The operation frequency can be programmed by setting external resistor value at RI pin.

The 0B3362F integrates 4 channels current balancer with up to 200mA current capability per channel and it can achieve 3% matching accuracy among LED strings. The minimum voltage of current source is regulated to as lower as 350mV, which benefits the efficiency and improves the IC thermal performance.

The OB3362F supports external PWM dimming and internal burst dimming mode which allow flexible control of the backlight luminance. The LED current is directly modulated by external PWM duty cycle when PWM dimming mode is selected. The LED current can be adjusted by an external DC voltage when internal burst dimming mode is selected.

Pinouts:

Features

1. 10V gate drive, better MOS compatibility

2. High Efficiency and Compact Size

3. 6V to 30V Input Voltage Range

4. 3% Matching Accuracy Between 4 LED Strings Control Current

5. 100KHz~600KHz Operating Frequency

6. Internal/External PWM Dimming

7. Very Low Standby Power

Reference Site: https://monitor.net.ru/forum/ob3362rp-info-530179.html

OB3362HP Datasheet PDF

 

Other data sheets are available within the file: OB3362, OB3362FHPA, OB3362FRPA, 0B3362HP, OB3362RP