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PDF ( 数据手册 , 数据表 ) BP1808

零件编号 BP1808
描述 Buck and Buck-Boost DC/DC LED Driver
制造商 BPS
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BP1808 数据手册, 描述, 功能
BP1808
晶丰明源半导体 Boost, Buck and Buck-Boost DC/DC LED Driver
Description
The BP1808 is a DC/DC constant current LED driver
with an integrated 70V/300mΩ MOSFET designed
for a wide input-voltage range of 3V to 60V. The
BP1808 can be configured as Buck, Boost and Buck-
Boost topology.
With a current sense reference of 200mV, the LED
current is programmed by an external current sense
resistor and the power loss is minimized. The BP1808
allows both analog and PWM dimming by DIM pin.
The fixed 420kHz operating frequency minimizes size
of external inductor, input and output capacitor.
Current mode operation provides fast transient
response and easy loop stability.
BP1808 offers rich protection functions including
VDD under voltage protection, output over voltage
protection, cycle-by-cycle peak current limit and
thermal regulation.
The BP1808 adopts SOP8-EP package for enhanced
power dissipation.
Features
Wide 3V to 60V Input Voltage Range
Supporting Boost, Buck-Boost, Buck Topology
Integrated 70V/300mΩ MOSFET
±3% LED Output Current Accuracy
Combined Analog and PWM Dimming
Fixed 420kHz operating Frequency
Adjustable Soft-Start
Cycle-by-Cycle Peak Current Limiting
VDD Under Voltage Protection
Programmable Over Voltage Protection
Thermal Regulation Function
Available in SOP8-EP Package
Applications
MR16 LED Lighting
Smart Dimming LED lighting
Automotive LED Lighting
Solar LED lighting
Other LED Lighting
Typical Application (Boost)
VIN
5 SW
VOUT 7
6 VDD
CS 8
BP1808
2 COMP
OVP 1
option
3 DIM
GND 4
Ordering Information
Figure 1. Typical application (Boost)
BP1808_EN _DS_Rev.1.1
www.bpsemi.com
BPS Confidential Customer Use Only
1







BP1808 pdf, 数据表
BP1808
晶丰明源半导体 Boost, Buck and Buck-Boost DC/DC LED Driver
Inductor Selection
Inductor value ranges from 10μH to 47μH in typical.
To prevent core saturation, ensure that the inductor
saturation current rating exceeds about 30%-40% of
the peak inductor current for the application.
between the chip and Rcs, the inductor, the diode, the
input capacitor, and the output capacitor. Keep traces
short, direct, and wide. Keep noisy traces, such as the
SW node trace, away from Rcs.
Schottky Diode Selection
The BP1808’s high switching frequency demands a
high-speed rectification diode for optimum efficiency.
A Schottky diode is recommended due to its fast
recovery time and low forward-voltage drop. Ensure
that the diode’s average and peak current rating
exceed the average output current and peak inductor
current. In addition, the diode’s reverse breakdown
voltage must exceed the maximum output voltage.
PCB Layout
The following rules should be followed in BP1808
PCB layout:
Bypass Capacitor
The VDD and COMP bypass capacitors need to be
placed as close as possible to the device. In particular,
place the VDD bypass capacitors very close to the
GND of device.
Ground Path
Minimize ground noise by connecting the IC-GND
lead, the input bypass capacitor ground lead, and the
output filter capacitor ground lead to a single point. A
ground plane is required. Minimize lead lengths to
reduce stray capacitance, trace resistance, and
radiated noise.
The Area of Power Loop
The area of main current loop should be as small as
possible to reduce EMI radiation, such as the inductor,
the power MOSFET, the output diode and the bus
capacitor loop.
The Trace
When laying out a board, minimize trace lengths
BP1808_EN _DS_Rev.1.1
www.bpsemi.com
BPS Confidential Customer Use Only
8














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