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BP1808 PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 BP1808
기능 Buck and Buck-Boost DC/DC LED Driver
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BP1808 데이터시트, 핀배열, 회로
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, 반도체, 판매, 대치품
BP1808
晶丰明源半导体 Boost, Buck and Buck-Boost DC/DC LED Driver
Electrical Characteristics (Notes 3, 4) (Unless otherwise specified, VOUT=15Vand TA =25 )
Symbol
Supply Voltage Section
Parameter
Conditions
Min Typ Max Units
VIN
VDD_ON
VDD_UVLO,HYS
VDD_REG
Input Voltage
VDD Turn On Threshold
VDD Turn off Hysteresis Voltage
VDD Regulation
VDD Rising
VDD Falling
Vout=6V
3 60 V
2.5 V
200 mV
4.9 V
Operating Current and Frequency Section
ISD
IQ
fSW
DMAX
Shutdown Current
Quiescent Current
Switching Frequency
Maximum Duty Cycle
Over Voltage Protection Section
VOVP
Over Voltage Protection Threshold
VDIM=0V
VCOMP=0V
80
200
420
85
1.2
uA
uA
kHz
%
V
Enable and Dimming Section
VEN
VEN_HYS
IDIM
VDIM_LOW
VDIM_HIGH
fDIM
TShutdown
Enable Threshold
Enable Hysteresis Voltage
DIM Pin Pull-up Current
Dim Low
Dim High
PWM Dimming Frequency Range
DIM Shutdown Delay
Current Sense Section
VOUT-VCS
MOSFET Section
Current sense voltage
RDS_ON
ILIM
BVDSS
Static Drain-source On-resistance
Current Limit
Drain-Source Breakdown Voltage
Thermal Regulation Section
DIM Rising
DIM Falling
VDIM=0V
VDIM Keep Low
ID=200mA
VGS=0V/IDS=10uA
0.4
200
1.3
0.55
1.75
0.1
15
200
300
3
70
V
mV
uA
V
V
1 kHz
ms
mV
mΩ
A
V
Symbol
Parameter
Conditions
Min Typ Max Units
TREG
Thermal Regulation Temperature
140
Note 3: production testing of the chip is performed at 25°C.
Note 4: the maximum and minimum parameters specified are guaranteed by test, the typical value are guaranteed by design, characterization and statistical
analysis
BP1808_EN _DS_Rev.1.1
www.bpsemi.com
BPS Confidential Customer Use Only
4

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BP1808 전자부품, 판매, 대치품
BP1808
晶丰明源半导体 Boost, Buck and Buck-Boost DC/DC LED Driver
The BP1808 is a DC/DC convertor with a wide input-
voltage range of 3V to 60V. The device can operate in
Boost, Buck and Buck-Boost application.
Start Up
The BP1808 integrates a soft-start circuit. When
VCOMP rises above 1.0V, the internal MOSFET begins
switching with an increasing duty cycle.
When the value of CCOMP is less than 8nF, the BP1808
has internal soft-start by charging CCOMP with a rate
of 1V/ms, and the time of soft-start is 1ms.If the
system needs longer soft-start time, a larger CCOMP
can be used. A fixed current source (8uA) will charge
CCOMP to 1V. Use equation below to calculate the soft-
start time(tSS) when CCOMP is larger than 8nF.
tSS
1V
* CCOMP
8uA
(ms)
The relationship between tSS and CCOMP is shown as in
Figure7
Analog and PWM Dimming
The BP1808 allows both analog and PWM dimming.
When VDIM is less than 0.2V, the device is turned off.
For analog dimming, when VDIM rises from 0.55V
to1.75V, the LED current will change from 0% to 100%
of the maximum LED current. If VDIM is higher than
1.75V, maximum LED current is generated. If a PWM
signal is used, its amplitude VDIM must exceed 1.75V.
Apply a 100Hz to 1 kHz PWM signal to DIM pin, the
LED current will change from 0% to 100% according
to the duty cycle.
Over Voltage Protection
Over Voltage Protection (OVP) occurs when the LED
is open in Boost and Buck-Boost application. The
OVP comparator threshold is 1.2V with 100mV
hysteresis. In normal operation, the recommended
OVP threshold is about 1.3~1.5 times higher than the
normal output voltage.
tss
2ms
1ms
8nF 16nF CCOMP
Figure 7. tSS VS CCOMP
Shutdown
The BP1808 enters shutdown mode when VDIM is less
than 200mV for more than 15ms. In shutdown mode,
supply current is reduced to 80μA , CCOMP is
discharged to zero during shutdown period.
Constant Current Control
The current in LED can be programmed by external
current sense resistor through the equation:
R
=
0.2
Thermal Regulation
The BP1808 integrates thermal regulation function.
When the system is over temperature, the output
current is gradually reduced, and 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 140internally.
Capacitor Selection
The typical value for the input capacitor is10μF and
the typical value for the output capacitor is 1μF.
Larger value capacitors can be used to further reduce
input and output ripple. Keep the capacitor impedance
low at switching frequency is important, ceramic
capacitors with at least X7R dielectrics are highly
recommended. CCOMP stabilizes the loop and controls
soft-start time. Connect a 1nF capacitor from COMP
pin to GND.
BP1808_EN _DS_Rev.1.1
www.bpsemi.com
BPS Confidential Customer Use Only
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BP1808

Buck and Buck-Boost DC/DC LED Driver

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