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PDF BP2808 Fiche technique - BPS

Numéro de référence BP2808
Description LED Constant Current Driver
Fabricant BPS 
Logo BPS Logo 



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BP2808 Datasheet, Description
General Description
The BP2808 is a current mode control LED driver IC.
The BP2808 can support DC voltage which ranges
from 12V to 600V, with duty cycle up to 100%. The
BP2808 can be used in non-isolation LEDs driving
system and can support AC supply voltage from 85V to
265V. The BP2808 uses patented technique for source
driver and constant current compensation, so LEDs
current has ±3accuracy with AC supply voltage
variation from 85V to 265V. What’s more, the patented
technique for the driving scheme ensures 90% higher
efficiency in the application of 18W LEDs lighting with
AC voltage range from 85V to 265V. In AC voltage
range from 85V to 265V, the BP2808 can drive
3W-36W LEDs array which is widely used in
E14/E27/PAR30/PAR38/GU10 lighting and tube LEDs
lighting.
The BP2808 has multiple LED protections, including
LED open-circuit protection, LED short-circuit
protection and thermal shutdown protection. If system
has a failure, the BP2808 will operate in protection
mode until system recovers.
The BP2808 is available in SOP8 packages.
Application
‹ LED Tube lighting
‹ E14/PAR30/PAR38/GU10/E27 LED spotlight
‹ LED Street lighting
‹ LED Signal lighting
‹ LED down-light
Features
‹ Source driver structure
‹ Constant current compensation
‹ System DC supply voltage: 12V to 600V.
System AC supply voltage: 85V to 265V.
‹ Duty Cycle up to 100%.
‹ Typical ±5% output current accuracy.
‹ Up to 95% system efficiency.
‹ LED open-circuit protection; LED short-circuit
protection.
‹ Internal thermal shutdown protection.
‹ Single DIM pin for dynamic temperature
compensation and brightness control using DC
voltage or PWM signal
Typical Application
93%
92%
91%
90%
89%
88%
85 105 125 145 165 185 205 225 245 265
251
250
249
248
247
246
85 105 125 145 165 185 205 225 245 265
Figure 1 Efficiency vs. Line Voltage
Figure 2 Output Current vs. Line Voltage
Brightness Power Semiconductor
BP2808_DS_EN_V2.0 Dec 2009
Page 1
BP2808 Fiche technique
Pin ASSIGNMENT
Pin Description
PIN No.
1
2
3
4
5
6
7
8
PIN
NAMES
GND
LN
VDD
OUT
NC
CS
RT
DIM
Figure 5 Pin Assignment
DESCRIPTION
Signal and power ground. Connect directly to ground plane.
Line voltage compensation of the peak threshold. Sensing the voltage
between LN and VDD.
Input Supply Pin. Must be locally bypassed.
Drain of internal power switch, source of external power switch.
No connection
Current sense input, sampling resistor connected between CS and GND
Fixed turn off time setting
Enable switch, analog and PWM dimming input.
ORDERING INFORMATION
ORDERING
PART
BP2808ESO8
PACKAGE
SOP8
TEMPERATURE
RANGE
-40 oC to 85 oC
TRANSPORT
MEDIA
Tape and Reel
MARKING
BP2808
Brightness Power Semiconductor
BP2808_DS_EN_V2.0 Dec 2009
Page 3

3 Page

BP2808 pdf
TSD-hys
Thermal Shutdown hysteresis
20
Note 4: Typical parameters are measured at 25˚C and represent the parametric norm.
Note 5: Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis.
Application Information
The BP2808 is a special constant current LEDs driver. BP2808 operates in continuous conduction mode
step-down converter system. By controlling LEDs peak current and ripple current, BP2808 can regulate LEDs
mean current. Using a few external components, BP2808 provides a solution to constant current control, with
DC voltage dimming and PWM signal dimming.
The resistor connected to RT programs MOSFET turn off time. At the beginning of each cycle, MOSFET is
turned on until the inductor current ramps up to its peak value I P = VREF / RCS (mA) . Once the MOSFET is
turned off, its off time is set byToff = 4 ×105 × RT (us) . When the off time is complete, MOSFET is
turned on again and repeats this operation. The off time control the ripple current
IR
103
=
× TOFF
L
× VLED
(mA)
and
LED
mean
current I LED
=
IP
1
2
×
I R (mA)
.
In
the
case
of
fixed
quantity LEDs system, voltage of each LED is relatively stable. So LEDs output current is constant, when
inductor value is settled. It is remarkable that, theoretically, LEDs current is independent on the line voltage
(Vbulk). However, practically, because of system delay, the peak current will follow with the increasing input
line voltage. The BP2808 uses a patented technique to compensate the peak current variation. The pin ‘LN’ is
used to detect input line voltage and compensate output current. For example, if the potential difference of LN
and VDD is 1V, the CS threshold will decrease 30mV. In this way, system can provide constant current in a
wider voltage range. Moreover, the LN pin can compensate the output voltage variation, as well. For more
information, please refer to AN-211.
To achieve high system efficiency, BP2808 utilizes special technique to drive power MOSFET by source driver
scheme. In this way, the chip operating current is extremely low. On the same time, system efficiency is greatly
enlarged by using power MOSFET’s dissipation to supply chip through the feeding diode.
The DIM pin of BP2808 can be used as enable switch, DC voltage dimming and PWM dimming input. DIM
pin of BP2808 can use DC voltage dimming to compensate system temperature dynamically, as well.
BP2808 has the feature of thermal shutdown, output LEDs short-circuit protection and open-circuit protection.
This device is suitable for high efficient LEDs tube lighting and spotlight.
Brightness Power Semiconductor
BP2808_DS_EN_V2.0 Dec 2009
Page 6

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Un datasheet est un document fourni par le constructeur du composant, où figurent toutes les données techniques sur le produit: puissance dissipée, courant maximal, tension de seuil, tension de claquage, température de stockage, etc.


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