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TEA1506 データシート(PDF) 8 Page - NXP Semiconductors |
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TEA1506 データシート(HTML) 8 Page - NXP Semiconductors |
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8 / 22 page  2003 Sep 09 8 Philips Semiconductors Product specification GreenChip ™II SMPS control IC TEA1506P; TEA1506AP; TEA1506T; TEA1506AT Demagnetization The system will be in discontinuous conduction mode all the time. The oscillator will not start a new primary stroke until the secondary stroke has ended. Demagnetization features a cycle-by-cycle output short-circuit protection by immediately lowering the frequency (longer off-time), thereby reducing the power level. Demagnetization recognition is suppressed during the first tsuppr time. This suppression may be necessary in applications where the transformer has a large leakage inductance, at low output voltages and at start-up. If pin DEM is open-circuit or not connected, a fault condition is assumed and the converter will stop operating immediately. Operation will recommence as soon as the fault condition is removed. Minimum and maximum ‘on-time’ The minimum ‘on-time’ of the SMPS is determined by the Leading Edge Blanking (LEB) time. The IC limits the ‘on-time’ to 50 µs. When the system desires an ‘on-time’ longer than 50 µs, a fault condition is assumed (e.g. removed Ci in Fig.12), the IC will stop switching and enter the safe restart mode. OverVoltage Protection (OVP) An OVP mode is implemented in the GreenChip series. This works for the TEA1506 by sensing the auxiliary voltage via the current flowing into pin DEM during the secondary stroke. The auxiliary winding voltage is a well-defined replica of the output voltage. Any voltage spikes are averaged by an internal filter. If the output voltage exceeds the OVP trip level, an internal counter starts counting subsequent OVP events. The counter has been added to prevent incorrect OVP detections which might occur during ESD or lightning events. If the output voltage exceeds the OVP trip level a few times and not again in a subsequent cycle, the internal counter will count down with twice the speed compared with counting-up. However, when typical 10 cycles of subsequent OVP events are detected, the IC assumes a true OVP and the OVP circuit switches the power MOSFET off. Next, the controller waits until the UVLO level is reached on pin VCC. When VCC drops to UVLO, capacitor CVCC will be recharged to the Vstart level. Regarding the TEA1506, the IC will not start switching again. Subsequently, VCC will drop again to the UVLO level, etc. Operation only recommences when the VCC voltage drops below a level of about 4.5 V. Regarding the TEA1506A, when the Vstart level is reached, switching starts again (safe restart mode) when the Vstart level is reached. This process is repeated as long as the OVP condition exists. The output voltage Vo(OVP) at which the OVP function trips, can be set by the demagnetization resistor, RDEM: where Ns is the number of secondary turns and Naux is the number of auxiliary turns of the transformer. Current I(OVP)(DEM) is internally trimmed. The value of RDEM can be adjusted to the turns ratio of the transformer, thus making an accurate OVP possible. V o OVP () N s N aux ----------- I(OVP)(DEM) RDEM × V clamp(DEM)(pos) + {} = |
同様の部品番号 - TEA1506 |
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同様の説明 - TEA1506 |
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