SPH4692 Datasheet | Siemens Semiconductor Group

Features q Fold-back characteristics provides overload protection for q q q q q q q external ponents Burst operation under secondary short-circuit condition implemented Protection against open or a short of the control loop Switch-off if line voltage is too low (undervoltage switch-off) Line voltage depending pensation of fold-back point Soft-start for quiet start-up without noise generated by the transformer Chip-over temperature protection implemented (thermal shutdown) On-chip ringing suppression circuit against parasitic oscillations of the transformer P-DIP-18-4 Power MOSFET q VDS = 600 V q R DS ON = 3.0 Ω q Repetitive Avalanche Type SPH 4692 Ordering Code Q67000- A5069 Package P-DIP-18-4 The Siemens Power Hybrid SPH 4692 contains the SMPS IC TDA 4605-3 as well as the SIEMENS POWER MOSFET in a P-DIP-18 package. The IC TDA 4605-3 controls the MOS-power transistor and performs all necessary control and protection functions 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. Semiconductor Group SPH 4692 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 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 independent of load variations. The required control information is taken from the input voltage during the switch-on period of the transistor and from a regulation winding during the switch-off period. A new cycle will start if the transformer has transferred the stored energy pletely into the load. In the different load ranges the switched-mode power supply (SMPS) behaves as follows:...