THX203H – Switching Power Controller IC

Part number : THX203H, THX203H-8V

Functions : PWM Switching Power Supply Controller IC

Package information : DIP 8 Type

Manufacturer : TongHuaXin ( THX Micro-elec )

Image :

THX203H circuit diagram

 

Description

THX203H provides features such as overvoltage protection, overcurrent protection, and thermal shutdown to ensure safe and reliable operation of the power supply.

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 18W. The combination of optimized reasonable circuit design and bipolar facture technology with high performance and price ratio economizes the whole cost ultimately.

 

Pinout

1 OB base electrode of power tube, control terminal of start-up current, external startup resistance

2 VCC supply electric pins

3 GND meet grounding pins

4 CT oscillate capacitance pins, external timing capacitance

5 FB feedback pins

6 IS switching current sampling and limit enactment, sampling resistance of external current

7,8 OC output pins, meet switching transformer

 

Characteristics

1. Set-in high-voltage power switch tube of 700V and few peripheral components

2. With the modulation of lock pulse width, the testing is according to the pulse limit
current.

3. With the function of output frequency reduction, the non-output power consumption can
be less than 0.3W.

4. Inner-built ramp and anti-feedback compensation function

5. The independent upper-limit current testing controller deals with over-current and
over-load of the controller real-timely.

6. The period emission pole is turned off and it outputs by deflected voltage, and the
pressure resistance of the power tube is improved.

 

Application Circuits

 

 

THX203H Datasheet PDF

THX203H pdf

 


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