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PDF SD6857TR Data sheet ( Hoja de datos )

Número de pieza SD6857TR
Descripción PRIMARY SIDE CONTROLLED LED CONTROLLER WITH PFC
Fabricantes SILAN MICROELECTRONICS 
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SD6857_Datasheet
PRIMARY SIDE CONTROLLED LED CONTROLLER WITH PFC
DESCRIPTION
SD6857 is the primary side controlled LED controller with PFC.
It adopts PFM technology for providing accurate constant current
control with high average efficiency.
With SD6857, opto-couple, secondary feedback control, loop
compensation circuit can be eliminated for reducing cost.
FEATURES
* Active power factor correction (APFC)
* PSR CC/CV
* Ultra-low start-up current
* Primary side control
* Leading edge blanking
* Pulse-Frequency Modulation(PFM)
* VCC overvoltage/undervoltage protection
* LED open/short circuit protection
* Internal over temperature protection
* Cycle by cycle current limiting
* Open loop protection
* Peak current compensation
SOP-8-225-1.27
APPLICATIONS
* LED lamp
* Illuminance with AC input
ORDERING INFORMATION
Part No.
SD6857
SD6857TR
Package
SOP-8-225-1.27
SOP-8-225-1.27
Marking
SD6857
SD6857
Material
Pb free
Pb free
Packing
Tube
Tape & reel
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:1.1 2012.04.27
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SD6857TR pdf
SD6857_Datasheet
3. Peak current detection
It integrates MOSFET and sense resistor. When MOSFET is on, voltage at FB is negative and primary
current is detected through sense resistor, this current is linearity increased. The peak current is
determined by the multiplier when this current exceeds the peal current, DRI0, MOSFET is off.
4. Feedback Voltage Detection
When MOSFET is off, the voltage at pin FB is positive and voltage is sensed at 2/3 duration of this positive
voltage, this sensed voltage is used for TCV control after comparison, amplifying and holding.
TOFF1, TOFF2 and TON are counted at the same time which indicates durations of positive FB voltage, FB
damping oscillation and FB negative voltage respectively. Positive FB voltage indicates there is current
delivered to the secondary side of transformer, while negative and FB damping oscillation indicate there is
no current delivered to the secondary side of transformer.
Hence, with constant peak current, TOFF1TOFF2TON is guaranteed for CC output. CC is available by TCC
controlling through high/low VFB duration measure.
5. Over voltage protection
The output is shutdown if voltage at FB exceeds the threshold value and this state is kept for 19ms, then
the circuit restarts.
6. Over Temperature Protection
If the circuit is over temperature, the output is shut down to prevent the circuit from damage. The over
temperature protection has the hysteresis characteristic. The temperature should be decreased lower than
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:1.1 2012.04.27
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