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| ILA4605-2 Control IC for Switched Mode Power Supplies using MOS Transistors The IC ILA 4605-2 controls the MOS - power transistor and performs all necessary regulation and monitoring function in free running flyback converters. Because of the fact that a wide load range is achieved, this IC is applicable for consumer as well as industrial power supplies. The serial circuit and primary winding of the flyback transformer are connected in series to the input voltage. During the switch - on period of the transistor, energy is stored in the transformer. During the switch - off period the energy is fed to the load via the secondary winding. By varying 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 independent 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 will start if the transformer has transferred the stored energy completely into the load. FEATURES: * * * * * * * Fold - back characteristics provides overload protection for external components Burst operation under secondary short - circuit condition implemented Protection against open or short of the control loop Switch - off if line voltage is too low (undervoltage switch - off) Line voltage depending compensation of fold - back point Soft start for quiet start - up without noise generated by the transformer Chip - over temperature protection (thermal shutdown) On - chip ringing suppression circuit against parasitic oscillations of the transformer P-DIP-8-1 * In the different voltage ranges the switched - mode Power supply (SMPS) behaves as follow: No load operation. The Power supply is operating in the burst mode at typical 20 to 40 kHz. The output voltage can be a little bit higher or lower than the nominal value depending on the design of the transformer and the resistors of the control voltage divider. Nominal operation. The switching frequency is reduced with increasing load and decreasing AC voltage. The duty factor primarily depends on the AC voltage. The output voltage is only depends on the load. Overload point. Maximum output Power is available at this point of the output characteristic. Overload. The energy transferred per operation cycle is limited at the top. Therefore the output voltages declines by secondary overloading. PIN DEFINITION Pin # 1. 2. 3. 4. 5. 6. 7. 8. Function Information Input Concerning Secondary Voltage Information Input Regarding the Primary Current Input for Primary Voltage Monitoring Ground Output Supply Voltage Input Input for Soft Start and Integrator Circuit Input for the Feedback of the Oscillator 1 ILA4605-2 Block Diagram 6 2 5 Reference Voltage typ. 3V V2B Supply Voltage Monitor Primary Current Voltage Converter Output Stage and Current Control Circuit 4 VREF V6min V6A V6E V6max VST Start Pulse Generator Logic Current Source VR 1 Control & Overload Amplifier Stop Comparator Zero Crossing Detector Fold-back Point Correction VV Primary Voltage Supervision 3 7 8 ABSOLUTE MAXIMUM RATINGS Ta=-20 to 85oC; all voltages relatives to Vpp Parameter Voltages pin 1 pin 2 pin 3 pin 4 pin 5 pin 6 pin 7 Current pin 1 pin 2 pin 3 pin 4 pin 5 pin 6 pin 7 pin 8 Junction temperature Storage temperature Operating Range Supply voltage Ambient temperature Symbol V1 V2 V3 V4 V5 V6 V7 I1 I2 I3 I4 I5 I6 I7 I8 Tj Tstg V6 Ta Limit Values min max -0.3 3 -0.3 -0.3 -0.3 -0.3 V6 -0.3 20 -0.3 3 3 3 -1.5 -0.5 1.5 0.5 3 -5 3 125 -40 125 7.5 -20 15.5 85 Unit V V V V V V V mA mA mA A A A mA mA o C o C o Notes Supply voltage tp50s; v0.1 * tp50s; v0.1 tp50s; v0.1 V C IC is on * tp= pulse width v = duty circle 2 ILA4605-2 CHARACTERISTICS Ta=25oC; VS=10V Parameter Symbol Limit Values min. max. 1.6 13 16 9.0 430 Units Test Condition Start - Up Hysteresis Start-up current drain Switch-on voltage Switch-on current Voltage Clamp (V6=10V; IC is off) At pins 2,3 (V6V6E) Control Range Control input voltage Voltage gain of the control circuit in the control value Push-Pull Output Stage Saturation voltages Pin 5 sourcing Pin5 sinking Protection Circuit Undervoltage protection for V6: voltage at pin 5 = V5min if V6< V6min Undervoltage protection for V6: voltage at pin 5 = V5min if V6> V6max I6EO V6E I6E1 Vmax V1R -VR 11 mA V mA V mV V6=V6E V6=V6E I2,3=1mA 5.6 370 150 Vsat0 VsatV V6min V6max 6 2.2 1.4 V V I5=-0.1A I5=+0.1A 8 16.7 V V APPLICATION DIAGRAM R3 4.7 FU1.25 180...260 V R4 330k R11 820k R2 27K 4W C4 33nF/630V D6 +124A R12 47k BYW76 D2 BA159 C11 47F CR1 4x1N4007 C1 150 F 385V n5 C5 4.7 nF n2 R10 5.1k C3 220pF R16 0.1 D5 +17.5A R1 75k BYW72 C10 470F T1 BUZ90 n4 R17 27 R15 0.1 D4 +8.5A C2 47F 100V R13 47 BYW72 D1 n3 C9 1000F 1N4148 6 C8 220nF47F 2 3 5 8 1 R9 10k R6 1K R7 2.5k R8 47 7 1087EY1 (TDA4605-2) 4 D3 n1 1N4148 R5 220 C6 1F C7 4.7nF 3 |
Price & Availability of ILA4605-2
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