LED Controller. BP3108 Datasheet
BP3108 is a primary side regulation (PSR) controller
with triac dimming designed for high brightness LED
driver. It’s extremely suitable to be used in flyback
converter operating in worldwide voltage range.
BP3108 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.
BP3108 integrates the triac dimming control circuit
internally.Few external components are required to
achieve wide triac dimming range and good dimming
effect without visible flicker.
BP3108 integrates high precision current sense
circuitry, which achieves ±3% LED current accuracy.
BP3108 offers rich protection features including LED
short/open circuit protection, over-temperature
protection, under-voltage lockout, VCC over voltage
BP3108 is assembled in SOP-8 package.
PSR constant current (CC) control，no secondary
feedback circuit required
±3% LED current accuracy
Ultra low operating current to improve efficiency
Low power consumption on FB resistor network
Worldwide 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
Triac dimming LED lighting
GU10/E27 LED bulb, spot light
LED PAR30/PAR38, down light
Other LED lighting
Figure 1 typical application circuit
Triac dimmng voltage detect，PWM dimming signal input
Dimming BJT driver
Analog dimming.Connect 1uF capacitor to GND while triac dimming.
The current sense pin used to sense the MOSFET current by means of an
external sense resistor. The resistor is connected between CS and GND
The output gate driver for an external N-channel power MOSFET.
Signal and Power ground
The voltage feedback from auxiliary winding.
-40 oC to 85 oC
Tape and Reel