Power IC for Quasi-Resonant Type Switching Power Supply
with High Efficiency and Low Noise in Full Load Range
The STR-W6735N is power IC for quasi-resonant type
switching power supply, incorporating a power MOSFET
and a controller IC. The product achieves high efficiency
and low noise power supply systems by the quasi-resonant
operation and the bottom-skip quasi-resonant operation.
Package name: TO-220F-6L (FM207)
Multi operation mode
The operation mode switching according to load
conditions achieves the optimal high efficiency and low
noise power supply systems across the full load range.
Current mode control
Built-in PWM oscillator
The PWM operates with the minimum frequency of
around 22kHz, until the quasi-resonant signal becomes
valid, reduces the stress on components at startup and
Built-in soft start function
Step-drive function, reducing switching noise
Input compensation at overcurrent
The function reduces the distortion of overcurrent
operation point to AC input voltage change by adding
Avalanche energy guaranteed by two chips structure
(Simplification of surge absorbing circuit)
Overcurrent protection (OCP); Pulse-by-pulse
Overload protection (OLP); latched shutdown
Overvoltage protection (OVP); latched shutdown
Switching power supplies for
LCD-TVs, PDP-TVs, CRT-TVs and Digital consumer
◆Typical application circuit
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Sanken Electric Co., Ltd.