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TDA4605 데이터시트(PDF) 4 Page - STMicroelectronics |
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TDA4605 데이터시트(HTML) 4 Page - STMicroelectronics |
4 / 6 page ELECTRICAL CHARACTERISTICS (VCC = 10V, Tamb =25 oC, unless otherwise specified) (continued) Symbol Parameter Test Conditions Min. Typ. Max. Unit GENERALLY VALID DATA (V6 = 10V) VOLTAGE OF THE ZERO Transition DETECTOR V8P Positive Clamping Voltage I8 = 1mA 0.75 V V8N Negative Clamping Voltage I8 = -1mA -0.2 V V8S Threshold Value 40 50 mV TUL Suppression of Transformer Ringing 3 3.8 4.5 µs -I8 Input Current V8 =0 0 4 µV PUSH-PULL OUTPUT STAGE SATURATION VOLTAGES VSatU Pin 5 Sourcing I5 = -0.1A 1.5 2.0 V VSatU Pin 5 Sinking I5 = +0.1A 1.0 1.2 V VSatU Pin 5 Sinking I5 = +0.5A 1.4 1.8 V OUTPUT SLOW RATE +dV5/dt Rising Edge 70 V/ µs -dV5/dt Falling Edge 100 V/ µs REDUCTION OF CONTROL VOLTAGE -I1 Current to reduce the Control Voltage V7 =1V 50 µA PROTECTION CIRCUIT V6(Min.) Undervoltage Protection for V6 : Voltage at Pin 5 = V5(Min.) if V6 <V6(Min.) 7.0 7.25 7.5 V V6(Max.) Overvoltage Protection for V6 : Voltage at Pin 5 = V5(Min.) if V6 >V6(Max.) 15 16 16.5 V V3A Undervoltage Protection for VAC : Voltage at Pin 5 = V5(Min.) if V3 <V3A V2 = 0V 970 1005 1040 mV Oj Over Temperature : at the given chip temperature the IC will switch V5 to V5(Min.) 150 oC V3Sat Voltage at Pin 3 if one of the protection functions was triggered ; (V3 will be clamped until V6 <V6A) I3 = 750 µA 0.4 0.8 V I6 Current Drain during Burst Operation V3 =V2 =0V 8 mA FUNCTIONAL DESCRIPTION In free running fly-back converters, the TDA4605 assumes control of a MOS power transistor and all necessary regulation and monitoring functions. The serial circuit of power transistor and primary winding of the flyback transformer is connected to the input voltage. During the switch-on period of the transistor, energy is stored in the transformer and during the switch-off period it is fed to te load via the secondary winding. By varing the switch-on time of the power transistor, the IC controls each portion of energy transferred to the secondary side such that the output voltage remains nearly inde- pendent of load variations. The required control information is taken from the input voltage during the switch-on period and from a regulation winding during the switch-off period. A new cycle begins as soon as the energy stored in the transformer has been totally delivered to the secondary side. In different load ranges, the SMPS will behave as follows : - No-Load Operation : The power supply unit oscillates in non continuous mode at a typical frequency of 20 to 40kHz. Depending upon the transformer winding and the regulated voltage divider, the output voltage can be slightly above the nominal value. - Normal Operation : Starting from typ. 200kHz, the switching frequency falls with increasing load and decreasing AC voltage. The duty cycle de- pends primarily on the AC voltage. The output voltage is only slightly load-dependen t. - OverloadPoint : Maximum output power is avail- able at this point of the output characteristics - Overload : The energy transferred per operation cycle is limited at the top. Therefore, the output voltage will fall with secondary oveloading. TDA4605 4/6 |
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