THX203H

Product Summary

The THX203H is a PWM controller of high performance current mode is specially designed for AC/DC transformer with high performance and price ratio, the THX203H supplies continuous output power of 12W within the range of wide voltage between 85V and 265V, the THX203H 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. The THX203H can be applied to the typical flyback circuit topology so as to form a simple AC/DC transformer. The startup circuit inside IC is designed as a particular current inhalation way, so it can start up with the magnification function of the power switch consumption for starting the resistance remarkably; 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 700V, which ensures the security of the power tube.

Parametrics

THX203H absolute maximum ratings: (1)Power supply voltage VCC: 16V; (2)Startup input voltage: 16V; (3)Pins input voltage: VCC+0.3V; (4)Endurance voltage of OC collector: －0.3~700V; (5)Switching current of peak value: 800mA; (6)Total dissipation power: 1000mW; (7)Operating temperature range: 0~＋125℃; (8)Deposit: temperature range: －55~＋150℃; (9)Welding temperature: ＋260℃,10S.

Features

THX203H features: (1) Inner built ramp and anti feedback compensation function; (2) The independent upper limit current testing controller deals with over current and over load of the controller real timely.; (3) The period emission pole is turned off and it outputs by deflected voltage, and the pressure resistance of the power tube is improved.; (4) Set in current limit resistance with temperature compensation, which makes the current limit precise; (5) Set in heat protection circuit; (6) Startup is accomplished with the magnification function of the switch power tube, and the power consumption of startup resistance is reduced more than10 times.; (7) Few peripheral components; (8) Low startup and operating current; (9) VCC over voltage automatic limit.

Diagrams