Hangzhou Silan Microelectronics Co., Ltd : Silan releases primary side control SMPS SD6853/6854 with MOSFET
December 12, 2011 at 08:34 pm EST
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Silan continuously unveiled new products in green
power controller field ---- the primary side control SMPS
SD6853/6854 with built-in 650V MOSFET. These series
circuits provide programmable cable loss compensation and
peak current compensation, and using PFM technology provide
accurate constant voltage/constant current (CV/CC) control
loop with high stability and average efficiency, which make
them widely used in mobile phone chargers, small power
adapters, standby power, MP3 and other portable
devices.
SD6853/6854is high end off-line SMPS controller with
built-in high voltage MOSFET, cable loss compensation and
peak current compensation. It uses
Silan's patented technology. The
circuit achieves the constant output voltage or current by
indirect control through detecting the primary winding
current and the auxiliary winding feedback voltage of the
transformer. In a certain output power range, the output
voltage can be set by feedback resistor; and the output
current can be set by peak current sensing resistor. The
cable loss compensation and peak current compensation can
be set according to the requirements to achieve the best
regulation rate of output voltage and output
current.
The normal operating cycle is divided into peak
current detecting and feedback voltage detecting: when the
MOSFET is on, the primary winding current is detected by
sensing resistor, the load is powered by output capacitor
and the output voltage VOUT decreased; When the primary
winding current reaches to the peak value, the MOSFET is
off and the voltage on pin FB is detected. The output
capacitor is charged by the energy stored in secondary
winding and the output voltage VOUT increased to power the
load. When the open conditions of constant voltage and
constant current circuits are satisfied at the same time,
the MOSFET is on and the circuit enters the peak current
detection again.
In addition, the device integrates various protection
circuits such as over temperature protection, loop open
protection, current limit, over voltage protection, and
under voltage lockout etc. to ensure the normal operating
environment and prolong its service life.
At present, 4.0W output power (5V /800mA) is
available for SD6853, 5.0W output power (5V /1A) is
available for SD6854, and the average efficiency is more
than 68% (using 1.8 m AWG28 cable); the standby power
dissipation is less than 100mW; the load regulation rate of
output voltage is less than
±4.0%and the input line voltage
regulation rate of output voltage is less than
±0.6%; the ESD of the whole system is
more than ±15KeV. In the
following, 3W~5W output power will be available for SD6853
and 5W~12W output power will be available for
SD6854.
Hangzhou Silan Microelectronics Co., Ltd. is a China-based company principally engaged in the design, manufacture and sales of electronic components. The Company is also engaged in the importing and exporting of mechanical and electrical products. The Company's main products include integrated circuits, semiconductor discrete devices and light-emitting diode (LED) products. The Company mainly operates its businesses in Zhejiang Province, China.