전자부품 데이터시트 검색엔진 |
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TDA4605-3 데이터시트(PDF) 10 Page - Infineon Technologies AG |
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TDA4605-3 데이터시트(HTML) 10 Page - Infineon Technologies AG |
10 / 23 page Version 2.0 10 1 Jul 2002 TDA 4605-3 Regulation, Overload and No-Load Behaviour When the IC has started up, it is operating in the regulation range. The potential at pin 1 typically is 400 mV. If the output is loaded, the regulation amplifier allows broader impulses ( V5 = H). The peak voltage value at pin 2 increases up to V2S max . If the secondary load is further increased, the overload amplifier begins to regulate the pulse width downward. This point is referred to as the overload point of the power supply. As the IC-supply voltage V6 is directly proportional to the secondary voltage, it goes down in accordance with the overload regulation behaviour. If V6 falls below the value V6 min , the IC goes into burst operation. As the time constant of the half-wave charge-up is relatively large, the short-circuit power remains small. The overload amplifier cuts back to the pulse width tpk . This pulse width must remain possible, in order to permit the IC to start-up without problems from the virtual short-circuit, which every switching on with V1 = 0 represents. If the secondary side is unloaded, the loading impulses ( V5 = H) become shorter. The frequency increases up to the resonance frequency of the system. If the load is further reduced, the secondary voltages and V6 increase. When V6 = V6 max the logic is blocked. The IC converts to burst operation.This renders the circuit absolutely safe under no-load conditions. Behaviour when Temperature Exceeds Limit An integrated temperature protection disables the logic when the chip temperature becomes too high. The IC automatically interrogates the temperature and starts as soon as the temperature decreases to permissible values. |
유사한 부품 번호 - TDA4605-3 |
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유사한 설명 - TDA4605-3 |
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