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부품번호 BP2327A
기능 Non-isolated Buck APFC LED Driver
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BP2327A 데이터시트, 핀배열, 회로
BP2327A
Non-isolated Buck APFC LED Driver
Description
The BP2327A is a high precision non-isolated buck
APFC LED driver, specially designed for universal
mains with constant current control. The driver with
on-chip PFC circuit achieves high power factor, low
THD and high efficiency.
The BP2327A integrates a 650V power MOSFET,
utilizes patent pending floating ground structure, and
operates in Critical Conduction Mode. The switching
loss is reduced and the inductor is fully utilized. The
inductor current is sensed during the whole switching
cycle and limited cycle by cycle. With few external
components, it achieves high precision output
current, excellent line regulation and load regulation.
The BP2327A offers full of protection functions to
improve the system reliability, including LED load
open circuit protection, LED load short protection,
VCC under voltage protection, Current Sense
resistor open circuit protection, and over
temperature protection. 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 driver is in
condition of over temperature.
Features
Active PFC for High Power Factor and Low THD
Integrated with 650V Power MOSFET
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 SOP-8 Package
Applications
LED retrofit lamps, Bulb, Spot Light, GU10/E27
LED PAR30, PAR38 Lamp
LED tube, LED String
Other LED Lighting
Typical Application
AC
BP2327A
5 DRAIN
FB 4
6 DRAIN
CS 8
3 VCC
1 COMP
CS 7
GND 2
BP2327A_EN _DS_Rev.1.3
Figure 1. Typical application circuit for BP2327A
www.bpsemi.com
Bright Power Semiconductor Co. Confidential Customer Use Only
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BP2327A pdf, 반도체, 판매, 대치품
BP2327A
Non-isolated Buck APFC LED Driver
Electrical Characteristics (Notes 4, 5) (Unless otherwise specified, VCC=17V and TA =25 )
Symbol
Parameter
Conditions
Min Typ
Supply Voltage Section
VCC_ON
VCC Turn On Threshold
VCC Rising
17
VCC_UVLO
VCC Turn Off Threshold
VCC Falling
7.8
VCC_CLAMP
ICC_UVLO
ICC
VCC Clamp Voltage
VCC Startup Current
VCC Operating Current
VCC Rising,
VCC= VCC_ON - 1V
FOP=10kHz,
20
33
300
Feedback Section
VFB_FALL
FB Falling Edge
Threshold Voltage
VFB_HYS
FB Hysteresis Voltage
VFB_OVP
FB Over Voltage
Protection Threshold
TON_MAX
Maximum On Time
FB Falling
FB Rising
0.2
0.15
1.6
20
TOFF_MIN
Minimum Off Time
3
TOFF_MAX
Maximum Off Time
100
Current Sense Section
VCS_LIMIT
TLEB_CS
TDELAY
CS Peak Voltage Limitation
Leading Edge Blanking
Time for Current Sense
Switch off Delay Time
1.5
350
200
Compensation Section
VREF
VCOMP_LO
VCOMP
VCOMP_HI
Internal Reference Voltage
COMP Low Clamp
Voltage
COMP Linear Operating
Voltage Range
COMP High Clamp
Voltage
0.194 0.2
1.5
1.5
4.0
Max Units
V
V
V
50 uA
500 uA
V
V
V
us
us
us
V
ns
ns
0.206
V
V
3.9 V
V
BP2327A_EN _DS_Rev.1.3
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Bright Power Semiconductor Co. Confidential Customer Use Only
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BP2327A 전자부품, 판매, 대치품
BP2327A
Non-isolated Buck APFC LED Driver
3 Feedback Network
The BP2327A senses the zero current crossing
information through the feedback network, the FB
falling threshold voltage is set to 0.2V with 0.15V
hysteresis. The FB pin is multiple used to detect
output voltage, the OVP threshold voltage is 1.6V.
The ratio of FB upper resistor to lower resistor can
be set as:
RFBL 1.6V
RFBL RFBH VOVP
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.
Where,
RFBL: The lower resistor of the feedback network
RFBH: The upper resistor of the feedback network
VOVP: Output over voltage setting point
4 Thermal Regulation
The BP2327A 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 typical thermal
regulation temperature is set to 150internally.
6 PCB Layouts
The following guidelines should be followed in
BP2327A PCB layout:
Bypass Capacitor
Put the bypass capacitor close to VCC pin, and loop
compensation capacitor to COMP pin.
Ground Path
Keep a short and wide ground path for current
sense resistor. The IC signal ground for COMP and
FB components should be connected to the IC
GND.
5 Protection Functions
To improve the system reliability, BP2327A offers
protection functions:
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 switching
frequency will work under 10 kHz. 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.
The Area of Power Loop
The area of main current loop should be as small
as possible to reduce EMI radiation.
FB Pin
Put the divider resistor close to the FB pin as
possible, and keep the trace away to the switching
node.
DRAIN Pin
To increase the copper area of DRAIN pin for better
thermal dissipation.
After the system enters into fault condition, the VCC
BP2327A_EN _DS_Rev.1.3
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Bright Power Semiconductor Co. Confidential Customer Use Only
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부품번호상세설명 및 기능제조사
BP2327A

Non-isolated Buck APFC LED Driver

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