Non-isolated Buck Offline LED Driver
BP9911CB 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 BP9911CB integrates a 500V power MOSFET.
With patent pending MOSFET driving technique, the
operating current of the IC is as low as 180uA. It
doesn’t need the auxiliary winding for VCC supply.
It can achieve excellent constant current performance
with very few external components, so the system
cost and size are minimized.
BP9911CB utilizes patent pending 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 BP9911CB offers rich protections to improve
the system reliability, including LED short circuit
protection, VCC under voltage protection and
thermal regulation function.
Internal 500V Power MOSFET
Integrated HV JFET for VCC Power Supply
Critical Conduction Mode Operation
Low Operating Current
±5% LED Output Current Accuracy
LED Short Protection
VCC Under Voltage Protection
Thermal Regulation Function
Available in CPC4 Package
LED Candle Light
Other LED Lighting
Figure 1. Typical application circuit for BP9911CB
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