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TEA1566J Scheda tecnica(PDF) 5 Page - NXP Semiconductors |
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TEA1566J Scheda tecnica(HTML) 5 Page - NXP Semiconductors |
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5 / 24 page  1999 Apr 20 5 Philips Semiconductors Preliminary specification GreenChip ™; SMPS module TEA1566 In case of output short circuit, the Vaux capacitor is no longer supplied by the auxiliary winding and its voltage drops till it reaches the UVLO level. If the output is an open circuit, the output voltage will rise till it reaches the Over Voltage Protection (OVP) level. The IC will detect this state and stop switching. In absence of switching of the power device, the Vaux capacitor will not be re-supplied and its voltage will drop till it reaches UVLO level. Once the Vaux voltage drops to UVLO level, the start-up current source is re-activated and it charges the Vaux capacitor to its start level and the system goes through a cycle similar to the start-up cycle. Figure 5 shows the relevant waveforms during safe-restart mode. The charging current (see symbol ‘Irestart-prot’ in Chapter “Characteristics”) from the start-up circuit during the safe-restart mode is lower than the normal start-up current (see symbol ‘Istart-high’ in Chapter “Characteristics”) in order to implement a low “hiccup” duty cycle. This helps insure devices on the output secondary winding do not get destroyed during output short circuit, violating safety conditions. The start-up current source also plays a key role in implementation of burst mode stand-by (see symbol ‘Irestart-stby’ in Chapter “Characteristics”), which will be explained later. Fig.4 Normal start-up waveforms. MGR694 t t (2) (1) 11 V 8.05 V Vaux Vout t Vgate switching off (1) Start-up current charges capacitor Vaux. (2) Charging of capacitor Vaux is taken-over by the auxiliary winding. Fig.5 Safe-start mode waveforms. handbook, full pagewidth MGR695 t t fault condition switching off (1) normal operation Vaux Vgate (1) Start-up current source charges capacitor Vaux. |
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