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BP2832A Schematic ( PDF Datasheet ) - BPS

Teilenummer BP2832A
Beschreibung Non-isolated Buck Offline LED Driver
Hersteller BPS
Logo BPS Logo 




Gesamt 8 Seiten
BP2832A Datasheet, Funktion
晶丰明源半导体
BP2832A
Non-isolated Buck Offline LED Driver
Description
The BP2832A 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 BP2832A 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 BP2832A 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 BP2832A 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 BP2832A
4 VCC DRAIN 5
2 ROVP DRAIN 6
3 NC
CS 7
1 GND
CS 8
BP2832A_EN _DS_Rev.1.0
Figure 1. Typical application circuit for BP2832A
www.bpsemi.com
BPS Confidential Customer Use Only
1






BP2832A Datasheet, Funktion
晶丰明源半导体
BP2832A
Non-isolated Buck Offline LED Driver
I LED
IPK
2
Where, IPK is the peak current of the inductor.
Inductor Selection
The BP2832A works under inductor current critical
conduction mode. When the power MOFET is
switched on, the current in the inductor rises up from
zero, the on time of the MOSFET can be calculated
by the equation:
t on
L IPK
VIN VLED
Where,
L is the inductance value
VIN is the DC bus voltage after the rectifier bridge
VLED is the voltage on the LED
small, the tOFF may be smaller than the minimum off
time, system will operate in discontinuous
conduction mode and the output current will be
smaller than the designed value. If the inductance is
too large, the tOFF may be larger than the maximum
off time, the system will operate in continuous
conduction mode and the output current will be
higher than the designed value. So it is important to
choose a proper inductance.
Over Voltage Protection
The over voltage protection can be programmed by
the ROVP pin resistor. The ROVP pin voltage is
0.5V.
When the LED is open circuit, the output voltage
increases gradually, and the demagnetization time
gets shorter. The demagnetization time at OVP----
Tovp can be calculated by the open circuit protection
voltage:
After the power MOSFET is switched off, the
current in the inductor decreases. When the inductor
current reaches zero, the power MOSFET is turned
on again by IC internal logic. The off time of the
MOSFET is given by:
t off
L IPK
VLED
The inductance can be calculated by the equation:
L VLED (VIN VLED )
f IPK VIN
Tovp L Vcs
Rcs Vovp
Where
Vcs is the CS pin turn off threshold (400mV)
Vovp is the open circuit protection voltage
And then the Rovp resistor value can be calculated
by the equation:
Rovp 15*Tovp*106 kohm
Protection Function
The f is the system switching frequency, which is
proportional to the input voltage. So the minimum
switching frequency is set at lowest input voltage,
and the maximum switching frequency is set at
highest input voltage.
The minimum and maximum off time of BP2832A is
set at 4.5us and 240us, respectively. Referring to the
equation of tOFF calculation, if the inductance is too
The BP2832A offers rich protection functions to
improve the system reliability, including LED
open/short protection, CS resistor short protection,
VCC under voltage protection, thermal regulation.
When the LED is open circuit, the system will
trigger the over voltage protection and stop
switching.
When the LED short circuit is detected, the system
works at low frequency (5kHz), and the CS pin turn
BP2832A_EN _DS_Rev.1.0
www.bpsemi.com
BPS Confidential Customer Use Only
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