PWM Controller of High-performance Current Mode
PWM controller of high-performance current mode is
specially designed for AC/DC transformer with high
performance and price ratio, which supplies continuous
output power of 12W within the range of wide-voltage
between 85V and 265V, the output power of peak value
can be up to 15W. The combination of optimized
reasonable circuit design and bipolar facture technology
with high performance and price ratio economizes the
whole cost ultimately. The power controller can be applied
to the typical fly-back circuit topology so as to form a
simple AC/DC transformer. When the output power is
lower, IC will reduce the working frequency automatically,
therefore, the standby power consumption becomes
extremely low. When the power tube is closed, the interior
circuit will bias it reversely, utilize the characteristic of high
pressure resistance CB of bipolar transistor directly, and
improve its pressure resistance capacity to the high
voltage of 800V, which ensures the security of the power
Meanwhile, the perfect function of overload and
saturation prevention is provided inside of IC, which can
keep away some abnormal status, such as overload,
saturation of transformer, and output short circuit, so as to
improve the reliability of the power supply. The current
limit and clock frequency can be set up by exterior
Now the standard encapsulation and the environmental
protection leadless encapsulation that meets European
standard of DIP8 are supplied .
Set-in high-voltage power switch tube of 800V and few
With the modulation of lock pulse width, the testing is
according to the pulse limit current.
With the function of output frequency reduction, the non-
output power consumption can be less than 0.3W.
Inner-built ramp and anti-feedback compensation
The independent upper-limit current testing controller
deals with over-current and over-load of the controller real-
The period emission pole is turned off and it outputs by
deflected voltage, and the pressure resistance of the power
tube is improved.
Set-in current limit resistance with temperature.
compensation, which makes the current limit precise.
Set-in heat protection circuit.
Startup is accomplished with the magnification function
of the switch power tube, and the power consumption of
startup resistance is reduced more than10 times.
Few peripheral components.
Low startup and operating current.
VCC over-voltage automatic limit.
Continuous wide-voltage output power reaches 12W,
and the output power of peak value arrives at 15W.
Adaptor (for example, travel charger, out
Open Frame (such as electromagnetic oven,
microwave oven and etc.)
© Power Source Inc.