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TEA2164S Datasheet(PDF) 6 Page - STMicroelectronics |
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TEA2164S Datasheet(HTML) 6 Page - STMicroelectronics |
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6 / 16 page  Collector Current Envelop t 0 t TEA2164S V CC Voltage 0 t 0 t 0 t 0 Output Voltage TEA5170 Output Voltage Envelop Standby µP Supply Voltage 1 2 V CC(START) V CC(STOP) t BURST t DELAY Bb Bb b b 1 2 t1 t2 Start-up Standby Standby Normal Operation t BURST : burst period t DELAY : time constant generated by µP B : burst envelop (out of regulation) b : burst envelop (with standby regulation) t1, t2 : commands issued by µP Figure 4 : System Description Waveforms II - GENERAL DESCRIPTION In a master slave architecture, the TEA2164SCon- trol IC, located at the primary side of an off line power supply achievesthe slavefunction ; whereas the master circuit is located at the secondary side. The link between both circuits is realized by a small pulse transformer (Figure 4). In the operation of the master-slave architecture, four majors cases must be considered : - normal operating - stand-by mode - power supply start-up - abnormal conditions : off load, short circuit, ... II.1 - Normal Operating (master slave mode) In this configuration, the master circuit generates a pulse width modulatedsignal issued from the moni- toring of the output voltage which needs the best accuracy (in TV applications : the horizontal deflec- tion stage supply voltage). The master circuit power supply can be supplied by another output. The PWM signal are sent towards the primary side through small differentiating transformer. For the TEA2164Spositive pulses are transistorswitching- on commands ; and negative pulses are transistor switching-off commands (Figure 5). In this configu- ration, only by synchronizing the master oscillator, the switching transistor may be synchronized with an external signal. II.2 - Stand-by Mode In this configuration the master circuit no longer sends PWM signals, the structure is not synchro- nized ; and the TEA2164Soperates in burst mode. The average power consumption at the secondary side may be very low 1W ≤ P ≤ 6W (as it is consumed in TV set during stand by). By action on the maximum duty cycle control, a primary loop maintains a semi-regulation of the output voltages.Voltage on feed-backis applied on Pin 9. Burstperiodis externallyprogrammedbycapacitorC1. TEA2164S 6/16 |
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