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TEA1566J Scheda tecnica(PDF) 4 Page - NXP Semiconductors |
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TEA1566J Scheda tecnica(HTML) 4 Page - NXP Semiconductors |
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4 / 24 page  1999 Apr 20 4 Philips Semiconductors Preliminary specification GreenChip ™; SMPS module TEA1566 PINNING FUNCTIONAL DESCRIPTION The GreenChip ™ family of ICs are highly integrated, with most common PWM functions like error amplifier, oscillator, bias current generator, and band gap based reference voltage circuits fully integrated in the ICs. High level of integration leads to easy and cost effective design of power supplies.The ICs have been fabricated in a Philips proprietary high voltage BCDMOS process that enables devices of up to 720 V to be fabricated on the same chip with low voltage circuitry. SYMBOL PIN DESCRIPTION Isense 1 programmable current sense resistor Vaux 2 IC supply capacitor Iref 3 reference resistor for setting internal reference currents Vctrl 4 feedback voltage for duty cycle control Gnd 5 ground Dem 6 demagnetization input signal from primary side auxiliary winding OOB 7 on/off/burst mode input signal NC 8 not connected Vin 9 MOSFET drain connection Fig.3 Pin configuration. handbook, halfpage Isense Vaux Iref Vctrl Gnd Dem OOB NC Vin 1 2 3 4 5 6 7 8 9 TEA1566 MGR693 An efficient on-chip start-up circuit enables fast start-up and dissipates negligible power after start up. On-chip accurate oscillator generates a saw tooth waveform which is used by the voltage mode feedback control circuitry to generate a pulse width modulated signal for driving the gate of the power MOSFET. A novel regulation scheme is used to implement both primary and secondary side regulation to minimize external component count. Protection features like over voltage, over current, over temperature, and demagnetization protection, give comprehensive safety against system fault conditions. The GreenChip ™ offers some advanced features that greatly enhance the efficiency of the overall system. Off-mode reduces the power consumption of the IC below 100 mW. Burst mode stand-by reduces the power consumption of the system to below 2 W. Low power operation mode reduces the operating frequency of the system, when the system is working under low load conditions, to reduce the switching losses. Start-up current source and Vaux management A versatile on-chip start-up current source makes an external, highly dissipating, trickle-charge circuit unnecessary. See Fig.2 for the block diagram of the IC. The start-up current source derives power from the mains via pin Vin (drain). It supplies current (see symbols ‘Istart-low’ and ‘Istart-high’ of Chapter “Characteristics”) to charge the Vaux (IC supply) capacitor and at the same time provides current to the control circuitry of the IC. Once the Vaux capacitor is charged to its start-up voltage level (11 V), the on-chip oscillator starts oscillating and the IC starts switching the power MOSFET. Power is then supplied to the load capacitor via the secondary winding. Figure 1 shows a typical flyback application diagram. The Vaux capacitor is also supplied by an auxiliary winding on the primary side. This winding is coupled to the secondary side winding supplying the output capacitor. As the output capacitor voltage increases and approaches its nominal value, the re-supply of the Vaux capacitor is done by the auxiliary winding. Figure 4 shows relevant waveforms at start-up. For successful take over of supply of Vaux capacitor by the auxiliary winding, it is important that the re-supply of Vaux capacitor starts before its voltage drops to its Under Voltage Lockout (UVLO) level of 8.05 V of the system and stops delivering power to the output. |
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