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BP9938X Scheda tecnica(PDF) 1 Page - Bright Power Semiconductor Co., Ltd. |
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BP9938X Scheda tecnica(HTML) 1 Page - Bright Power Semiconductor Co., Ltd. |
1 / 2 page BP9938X Non-isolated Buck Offline LED Driver BP9938X_EN _DS_Rev.1.1 www.bpsemi.com 1 BPS Confidential – Customer Use Only 晶丰明源半导体 Description BP9938X is a high precision Buck constant current LED driver. The device operates in critical conduction mode and is suitable for 85Vac~265Vac universal input offline LED lighting. The BP9938X integrates a 500V power MOSFET. With proprietary MOSFET driving technique. It doesn’t need VCC capacitor and startup resistor. It can achieve excellent constant current performance with very few external components, so the system cost and size are minimized. BP9938X utilizes proprietary current control method. It can achieve precise output current and excellent line regulation. The driver operates in critical conduction mode, the output current does not change with the inductance and output voltage. The BP9938X offers LED short circuit protection and thermal regulation function to improve the system reliability. Typical Application Features ◼ No VCC Capacitor and Startup Resistor ◼ Internal 500V Power MOSFET ◼ Integrated HV JFET for IC Power Supply ◼ No Auxiliary Winding ◼ Critical Conduction Mode Operation ◼ ±5% LED Output Current Accuracy ◼ LED Short Protection ◼ VCC Under Voltage Protection ◼ Thermal Regulation Function ◼ Available in SOT33-4 Package Applications ◼ LED Candle Light ◼ LED Bulb ◼ Other LED Lighting AC DRAIN CS 1 2 4 3 BP9938X HV GND Figure 1. Typical application circuit for BP9938X |
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