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PDF SD6854 Data sheet ( Hoja de datos )

Número de pieza SD6854
Descripción PRIMARY SIDE CONTROL SMPS
Fabricantes SILAN MICROELECTRONICS 
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SD6854_Datesheet
PRIMARY SIDE CONTROL SMPS WITH BUILT-IN MOSFET
DESCRIPTION
SD6854 is a primary side control SMPS with built-in MOSFET. It
features programmable cable drop compensation function, PFM
technology and CV/CC control loop with high reliability and
average efficiency.
With SD6854, opto-couple and Y capacitor, secondary feedback
control, loop compensation circuit can be eliminated for
reducing cost.
In a certain output voltage range, output voltage can be set
through feedback resistor, and output current also can be set
through peak current sense resistor. Setting cable drop
compensation and peak current compensation are also
available for optimized output voltage/current regulation.
FEATURES
* Built-in high voltage MOSFET
* Primary side control
* Low start-up current
* Leading edge blanking
* Pulse-Frequency Modulation(PFM)
* Overvoltage protection
* Undervoltage lockout
* Over temperature protection
* Cycle by cycle current limiting
* Open loop protection
* Cable drop compensation
* Peak current compensation
APPLICATIONS
* Mobile charger
* Adaptor with small power
* charger for MP3 and other portable
apparatus
* Stand-by power supply
ORDERING INFORMATION
Part No.
SD6854
SD6854G
Package
DIP-8A-300-2.54
DIP-8A-300-2.54
Marking
SD6854
SD6854G
Material
Pb free
Pb free
Packing
Tube
Tube
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:0.4 2011.02.11
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SD6854 pdf
SD6854_Datesheet
2. Peak current detection
When VDRIVE1, MOSFET is on, the linearly increased primary current is detected by the sense resistor.
When this current increases to the threshold value (peak value), the MOSFET is off and the driving voltage
VDRIVE0.
There is a burr when MOSFET is on, and MOSFET will be off by error if its voltage is up to the threshold
value VPK for the peak current. So the leading edge blanking time TLEB0.6μs is set to avoid this error.
3. Peak current compensation
The detected peak current value will be increased following the input AC voltage due to the off delay. And
the output current is deeply affected by the peak current, hence the voltage regulation is worse without
peak current compensation.
Peak current compensation is available in SD6854 through pin PCC by AC input voltage detecting. With
the compensation, the detected peak current is hold with different input AC voltages for better line
regulation.
The threshold value VPK0.7V is set by the circuit, that is, this value can be adjusted by RSEN. The peak
current compensation ability is decided by RPCC, the lower resistance, the higher compensation.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:0.4 2011.02.11
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