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PDF BP3105 Data sheet ( Hoja de datos )
| Número de pieza | BP3105 | |
| Descripción | High Precision PSR CC LED driver controller | |
| Fabricantes | BPS | |
| Logotipo |  |
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Description
BP3105 is a high precision primary side regulation
(PSR) controller designed for high brightness LED
driver. It’s extremely suitable to be used in flyback
converter operating in worldwide voltage range.
BP3105 works in discontinuous inductive current
mode. The patented control method dramatically saves
the system cost and size by eliminating all secondary
feedback circuitry and loop control compensation
circuitry. This control method also achieves excellent
line and load regulation.
BP3105 integrates high precision current sense
circuitry, which achieves ±3% LED current accuracy.
BP3105 offers rich protection features including LED
short/open circuit protection, over-temperature
protection, under-voltage lockout, VCC over voltage
protection.
BP3105 is assembled in tiny SOT23-5 package.
Features
PSR constant current (CC) control，no secondary
feedback circuit required
±3% LED current accuracy
Tiny SOT23-5 packagez
Ultra low operating current to improve efficiency
Low power consumption on FB resistor network
World wide voltage range
LED short/open circuit protection
VCC over voltage protection
Current sense resistor open circuit protection
Over temperature protection
No external loop compensation required
Applications
GU10/E27 LED bulb, spot light
LED PAR30/PAR38, down light
LED tube light
Other LED lighting
Typical Application
Figure 1 typical application circuit
BP3105_DS_V0.2 Nov.2010
www.bpsemi.com
Page 1
1 page  
Application Information
Figure 2 block diagram
BP3105 is a high performance AC/DC controller
specially designed for LED lighting. The patented
control method dramatically saves the system cost
and size by eliminating all secondary feedback
circuitry and loop control compensation circuitry. No
TL431 and opto-coupler is required to get excellent
constant current control.
1 Start up
The start-up current is designed to be low, only 25uA
start-up current is required for the device. After the
system is powered on, the Vcc capacitor is charged
through the start-up resistor, once the Vcc voltage
reaches the start-up threshold (14V typically), the
chip start to operate. During normal operation, The
Vcc is supplied via the auxiliary winding.
2 Constant current control
Cycle-by-Cycle current limiting is offered .The CS is
connected to non-inverting inputs of the current
sense comparator. The inverting terminal of
comparator is tied to an internal 500mV reference.
The comparator is constantly comparing the CS
voltage to the internal 500mV.Once the output of
BP3105_DS_V0.2 Nov.2010
www.bpsemi.com
Page 5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet BP3105.PDF ] | |
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