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TEA1533AP Datenblatt(PDF) 10 Page - NXP Semiconductors |
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TEA1533AP Datenblatt(HTML) 10 Page - NXP Semiconductors |
10 / 24 page 2002 Aug 23 10 Philips Semiconductors Product specification GreenChipTMII SMPS control IC TEA1533P; TEA1533AP Short winding protection After the leading edge blanking time, the short winding protection circuit is activated. If the ‘sense’ voltage exceeds the short winding protection voltage Vswp, the converter will stop switching. Once VCC drops below the UVLO level, capacitor CVCC will be recharged and the supply will restart again. This cycle will be repeated until the short-circuit is removed (safe restart mode). The short winding protection will also protect in case of a secondary diode short-circuit. OverTemperature Protection (OTP) An accurate temperature protection is provided in the circuit. When the junction temperature exceeds the thermal shutdown temperature, the IC will stop switching. When VCC drops to UVLO, capacitor CVCC will be recharged to the Vstart level. Regarding the TEA1533P, this 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 approximately 4.5 V (practically when the Vmains has been disconnected for a short period). Regarding the TEA1533AP, when the Vstart level is reached, switching starts again (safe restart mode). This process is repeated as long as the OTP condition exists. Control pin protection If pin CTRL is open-circuit or not connected, a fault condition is assumed and the converter will stop switching. Operation will recommence as soon as the fault condition is removed. Burst mode standby Pin CTRL is also used to implement the burst mode standby. In burst mode standby, the power supply enters a special low dissipation state. Figure 11 shows a flyback converter using the burst mode standby function. The system enters burst mode standby when the microcontroller activates NPN transistor T1 on the secondary side. When the voltage on Cmicro exceeds a certain voltage measured by the microcontroller, the opto-coupler is activated by T1, sending a large current signal to pin CTRL. In response to this signal, the IC stops switching and enters a ‘hiccup’ mode. This burst activation signal should be present for longer than the ‘burst blank’ period (typically 30 µs): the blanking time prevents false burst triggering due to spikes. Figure 12 shows the burst mode standby signals. The hiccup mode during burst mode standby operation does not differ from the hiccup mode at safe restart during a system fault condition (e.g. output short-circuit). The power is reduced during soft restart mode. Burst mode standby operation continues until the microcontroller stops activating transistor T1. The system then enters the start-up sequence and begins normal switching behaviour. handbook, halfpage MGU236 0.52 V (typ) 0.3 V (typ) IDEM Vsense(max) −24 µA (typ) −100 µA (typ) Fig.9 OPP correction curve. I burstmode V th R CTRL ---------------- I th(on) + = |
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Ähnliche Beschreibung - TEA1533AP |
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