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PDF BP2831A Data sheet ( Hoja de datos )
| Número de pieza | BP2831A | |
| Descripción | Non-isolated Buck Offline LED Driver | |
| Fabricantes | BPS | |
| Logotipo |  |
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 1. Non-isolated Buck Offline LED Driver  Hay una vista previa y un enlace de descarga de BP2831A (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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晶丰明源半导体
BP2831A
Non-isolated Buck Offline LED Driver
Description
The BP2831A 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 BP2831A integrates a 500V power MOSFET.
With patent pending MOSFET driving technique, the
operating current of the IC is very low. So it doesn’t
need the auxiliary winding for supplying the chip. It
can achieve excellent constant current performance
with very few external components, so the system
cost and size are minimized.
The BP2831A 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 LED output voltage.
The BP2831A offers rich protection functions to
improve the system reliability, including LED open
circuit protection, LED short circuit protection, VCC
under voltage protection, CS resistor short circuit
protection and thermal regulation function.
Features
Critical Conduction Mode Operation
Internal 500V Power MOSFET
No Auxiliary Winding
Ultra Low Operating Current
±5% LED Output Current Accuracy
LED Open Protection
LED Short Protection
Current Sensing Resistor Short Protection
VCC Under Voltage Protection
Thermal Regulation Function
Available in SOP-8 Package
Applications
LED Candle Light
LED Bulb
Other LED Lighting
Typical Application
AC BP2831A
4 VCC DRAIN 5
2 ROVP DRAIN 6
3 NC
CS 7
1 GND
CS 8
BP2831A_EN _DS_Rev.1.0
Figure 1. Typical application circuit for BP2831A
www.bpsemi.com
BPS Confidential – Customer Use Only
1
Free Datasheet http://www.datasheetlist.com/
1 page  
晶丰明源半导体
Internal Block Diagram
VCC
9.0V 14V
17V
BP2831A
Non-isolated Buck Offline LED Driver
DRAIN
VCC
HV
MOSFET
OTP
UVLO
RESET
OCP
OVP
ROVP
GND
CC &
Logic Control
LED
+
Current
Sense
-
400mV
CS
Figure 3. BP2831A Internal Block Diagram
Application Information
The BP2831A is a high performance non-isolated
Buck converter specially designed for LED lighting.
The device integrates a 500V power MOSFET. With
very few external components, the converter
achieves excellent constant current control. And it
does not need auxiliary winding for powering the IC
or voltage sensing, hence the system size and cost is
greatly reduced.
Start Up
After system powered up, the VCC pin capacitor is
charged up by the start up resistor. When the VCC
pin voltage reaches the turn on threshold, the internal
circuits start operating. The BP2831A integrates a
17V zener diode to clamp the VCC voltage. Due to
the ultra-low operating current, the auxiliary winding
is not needed to supply the IC.
Constant Current Control
Cycle by Cycle current sense is adopted in BP2831A,
the CS pin is connected to the current sense
comparator, and the voltage on CS pin is compared
with the internal 400mV reference voltage. The
MOSFET will be switched off when the voltage on
CS pin reaches the threshold. The CS comparator
includes a 350ns leading edge blanking time.
The peak inductor current is given by:
I PK
400
R CS
(mA)
Where, RCS is the current sense resistor value.
The current in LED can be calculated by the
equation:
BP2831A_EN _DS_Rev.1.0
www.bpsemi.com
BPS Confidential – Customer Use Only
5
Free Datasheet http://www.datasheetlist.com/
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet BP2831A.PDF ] | |
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