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부품번호 BP2325A
기능 Non-isolated Buck APFC Offline LED Driver
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BP2325A 데이터시트, 핀배열, 회로
BP2325A
Non-isolated Buck APFC Offline LED Driver
Description
The BP2325A is a high precision non-isolated buck
driver with active PFC, specially designed for
universal input offline constant current LED lighting.
The driver 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 BP2325A integrates a 500V power MOSFET.
With few external components, the LED output
current can be precisely controlled.
The BP2325A 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 BP2325A 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 driver is over temperature.
Features
Active PFC for High Power Factor and Low
THD
Internal 500V 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
GU10/E27 LED Bulb, Spot Light
PAR30, PAR38 Lamp
T8/T10 LED String
Other LED Lighting
Typical Application
BP2325A
5 DRAIN
FB 4
6 DRAIN
CS 8
3 VCC
CS 7
1 COMP GND 2
AC
BP2325A_EN _DS_Rev.1.0
Figure 1. Typical application circuit for BP2325A
www.bpsemi.com
Bright Power Semiconductor Co. Confidential Customer Use Only
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BP2325A pdf, 반도체, 판매, 대치품
BP2325A
Non-isolated Buck APFC Offline LED Driver
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_UVLO
VCC_CLAMP
VCC Turn On Threshold
VCC Turn Off Threshold
VCC Clamp Voltage
ICC_UVLO
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
TOFF_MIN
Minimum Off Time
TOFF_MAX
Maximum Off Time
Current Sense Section
VCC Rising
VCC Falling
VCC Rising,
VCC= VCC_ON - 1V
FOP=10kHz,
FB Falling
FB Rising
17 V
7.8 V
20 V
33 50 uA
300 500 uA
0.2 V
0.15 V
1.6 V
20 us
3 us
100 us
VCS_LIMIT
TLEB_CS
TDELAY
CS Peak Voltage Limitation
Leading Edge Blanking
Time for Current Sense
Switch off Delay Time
Compensation Section
1.0 V
350 ns
200 ns
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
0.206
V
V
1.5 3.9 V
4.0 V
BP2325A_EN _DS_Rev.1.0
www.bpsemi.com
Bright Power Semiconductor Co. Confidential Customer Use Only
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BP2325A 전자부품, 판매, 대치품
BP2325A
Non-isolated Buck APFC Offline LED Driver
3 Feedback Network
The BP2325A 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 BP2325A 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 BP2325A 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 (1V),
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
BP2325A 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 (DRAIN
pin trace), otherwise the FB pin OVP function might
have risk to be mis-triggered by the system noise.
DRAIN Pin
To increase the copper area of DRAIN pin for better
BP2325A_EN _DS_Rev.1.0
www.bpsemi.com
Bright Power Semiconductor Co. Confidential Customer Use Only
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