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부품번호 BP2329A
기능 Non-isolated Buck APFC Offline LED Controller
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BP2329A 데이터시트, 핀배열, 회로
BP2329A
Non-isolated Buck APFC Offline LED Controller
Description
The BP2329A is a high precision non-isolated buck
controller with active PFC, specially designed for
universal input offline constant current LED lighting.
The controller with on-chip PFC circuit achieves high
power factor and low THD. Operating in critical
conduction mode, the power MOSFET switching loss
is reduced and the inductor is fully utilized.
The BP2329A utilizes patent pending floating ground
structure. The inductor current is sensed during the
whole switching cycle. So it achieves high precision
output current control, and excellent line regulation
and load regulation.
The BP2329A offers rich protection functions to
improve the system reliability, including LED open
circuit protection, LED short circuit protection, VCC
under voltage protection, CS resistor open circuit
protection and cycle by cycle current limit. All the
protection functions are auto-recovery. The system
reliability is further improved by the thermal
regulation function. The output current is reduced
when the controller is over temperature.
Features
Active PFC for High Power Factor and Low
THD
System Efficiency up to 95%
±3% LED Output Current Accuracy
Excellent Line and Load Regulation
Critical Conduction Mode Operation
Ultra Low (33uA) Start Up Current
Ultra Low (300uA) Operating Current
LED Short/Open Protection
Current Sensing Resistor Open Protection
Cycle by Cycle Current Limit
VCC Under Voltage Protection
Auto Fault Recovery
Thermal Regulation Function
Available in Tiny SOT23-6 Package
Applications
GU10/E27 LED Bulb, Spot Light
PAR30, PAR38 Lamp
T8/T10 LED String
Other LED Lighting
Typical Application
BP2329A
6 FB GATE 4
1 VCC
CS 5
3 COMP GND 2
AC
BP2329A_EN _DS_Rev.1.1
Figure 1. Typical application circuit for BP2329A
www.bpsemi.com
Bright Power Semiconductor Co. Confidential Customer Use Only
1




BP2329A pdf, 반도체, 판매, 대치품
BP2329A
Non-isolated Buck APFC Offline LED Controller
Electrical Characteristics (Notes 4, 5) (Unless otherwise specified, VCC=17V and TA =25 )
Symbol
Parameter
Conditions
Min Typ Max Units
Supply Voltage Section
VCC_ON
VCC Turn On Threshold
VCC Rising
17 V
VCC_UVLO
VCC Turn Off Threshold
VCC Falling
7.8 V
VCC_CLAMP
ICC_UVLO
VCC Clamp Voltage
VCC Startup Current
ICC VCC Operating Current
Feedback Section
VFB_FALL
FB Falling Edge
Threshold Voltage
VFB_HYS
VFB_OVP
FB Hysteresis Voltage
FB Over Voltage
Protection Threshold
TON_MAX
Maximum On Time
VCC Rising,
VCC= VCC_ON - 1V
FOP=10kHz,
Load=100pF
FB Falling
FB Rising
20 V
33 50 uA
300 500 uA
0.2 V
0.15 V
1.6 V
20 us
TOFF_MIN
Minimum Off Time
3 us
TOFF_MAX
Maximum Off Time
100 us
Current Sense Section
VCS_LIMIT
TLEB_CS
CS Peak Voltage
Limitation
Leading Edge Blanking
Time for Current Sense
TDELAY
Switch off Delay Time
1.5 V
350 ns
200 ns
Compensation Section
VREF
VCOMP_LO
VCOMP
Internal Reference
Voltage
COMP Low Clamp
Voltage
COMP Linear Operating
Voltage Range
0.194 0.2 0.206
1.5
1.5 3.9
V
V
V
BP2329A_EN _DS_Rev.1.1
www.bpsemi.com
Bright Power Semiconductor Co. Confidential Customer Use Only
4

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BP2329A 전자부품, 판매, 대치품
BP2329A
Non-isolated Buck APFC Offline LED Controller
3 Feedback Network
The BP2329A senses the output current zero
crossing information through the feedback network,
the FB falling threshold voltage is set to 0.2V with
0.15V hysteresis. The FB pin is also used to detect
output OVP, the threshold voltage is 1.6V. The ratio
of FB upper resistor to lower resistor can be set as:
RFBL 1.6V
RFBL RFBH VOVP
Where,
RFBL: The lower resistor of the feedback network
RFBH: The upper resistor of the feedback network
VOVP: Output over voltage setting point
It is recommended that the FB lower resistor set to
5KΩ--10KΩ.
4 Thermal Regulation
The BP2329A integrates thermal regulation function.
When the system is over temperature, the output
current is gradually reduced; the output power and
thermal dissipation are also reduced. The system
temperature is regulated and the system reliability is
improved. The thermal regulation temperature is set
to 150internally.
5 Protection Functions
The BP2329A offers rich protection functions to
improve the system reliability.
When the LED is open circuit, the output voltage
will gradually rise up. The output voltage is sensed
by the FB pin when power MOSFET is turned off.
When FB voltage reaches the OVP threshold, it will
trigger fault logic and the system stops switching.
When the LED is shorted circuit, the system will
work under 10kHz switching frequency. Meanwhile,
the output voltage is low and the VCC pin cannot be
charged up by the output voltage, so the VCC pin
voltage will gradually decrease and finally reaches
the UVLO threshold.
After the system enters into fault condition, the VCC
voltage will decrease until it reaches UVLO
threshold. Then the system will re-start again. If the
fault condition is removed, the system will resume
normal operation.
When the output is short circuit or the inductor is
saturated, the CS peak voltage will be relatively high.
When CS voltage reaches the internal limitation
(1.5V), the power MOSFET will be turned off
instantaneously. This cycle by cycle current
limitation can help protecting the power MOSFET,
the inductor and the output diode.
6 PCB Layouts
The following guidelines should be followed in
BP2329A PCB layout:
Bypass Capacitor
The bypass capacitor on VCC pin should be as close
as possible to the VCC and GND pins.
Ground Path
The power ground path for current sense resistor
should be short and wide, and it should be as close as
possible to the IC ground (pin 2) , otherwise the LED
output current accuracy maybe affected. The IC
signal ground for COMP and FB components should
be connected to the IC GND pin with short traces
and should be away from the power ground path.
The Area of Power Loop
The area of main current loop should be as small as
possible to reduce EMI radiation.
FB Pin
The feedback resistor divider should be as close as
possible to the FB pin, and the trace must keeps
away from dynamic node of the inductor and
MOSFET DRAIN trace, otherwise the FB pin OVP
function might have risk to be mis-triggered by the
system noise.
BP2329A_EN _DS_Rev.1.1
www.bpsemi.com
Bright Power Semiconductor Co. Confidential Customer Use Only
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부품번호상세설명 및 기능제조사
BP2329A

Non-isolated Buck APFC Offline LED Controller

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