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TEA1532 Datasheet(PDF) 11 Page - NXP Semiconductors |
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TEA1532 Datasheet(HTML) 11 Page - NXP Semiconductors |
11 / 27 page 9397 750 13113 © Koninklijke Philips Electronics N.V. 2004. All rights reserved. Preliminary data sheet Rev. 01 — 28 May 2004 11 of 27 Philips Semiconductors TEA1532 GreenChip ™II SMPS control IC When pin DEM is grounded (CCM), the brown-out protection is disabled. In this case the duty cycle is limited to 0.7, so at low mains voltage the on-time is limited and therefore the dissipation in the FET is limited. 7.15 OverTemperature Protection (OTP) The IC provides accurate temperature protection. The IC will stop switching when the junction temperature exceeds the thermal shutdown temperature. When VCC drops to VUVLO, capacitor CVCC will be recharged to the Vstart level, however switching will not restart. Subsequently, VCC will drop again to VUVLO, etc.. Operation only recommences when VCC drops below a level of about 4.5 V (typically, when Vmains is disconnected for a short period). 7.16 Soft start-up (pin SENSE) To prevent transformer rattle at start-up or during hiccup, the transformer peak current is slowly increased by the soft start function. This can be achieved by inserting a resistor and a capacitor between pin SENSE (pin 6) and sense resistor Rsense. An internal current source charges the capacitor to Vsense =Iss × Rss (about 0.5 V maximum). The start level and the time constant of the increasing primary current level can be adjusted externally by changing the values of Rss and Css. The charging current ISS will flow as long as the voltage on pin SENSE is below approximately 0.5 V. If the voltage on pin SENSE exceeds 0.5 V, the soft start current source will start limiting current Iss. At Vstart, the Iss current source is completely switched off; see Figure 9. Since the soft start current Iss is supplied from pin DRAIN, the Rss value will not affect VCC current during start-up. Fig 9. Soft start-up. I primary(max) V ocp I ss R ss × () – R sense ------------------------------------------ = τ R ss C ss × = Css Rss SENSE Rsense Iss Vocp start-up mgu237 6 0.5 V |
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