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TEA1610P Folha de dados(PDF) 8 Page - NXP Semiconductors |
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TEA1610P Folha de dados(HTML) 8 Page - NXP Semiconductors |
8 / 21 page TEA1610T_P_3 © NXP B.V. 2007. All rights reserved. Product data sheet Rev. 03 — 26 March 2007 8 of 21 NXP Semiconductors TEA1610P; TEA1610T Zero-voltage-switching resonant converter controller Bridge frequency accuracy is optimum in the low frequency region. At higher frequencies both the dead time and the oscillator frequency show a decay. The frequency of the oscillator depends on the value of capacitor Cf, the peak-to-peak voltage swing VCf and the charge and discharge currents. However, at higher frequencies the accuracy decreases due to delays in the circuit. 8.6 Error amplifier The error amplifier is a transconductance amplifier. Thus the output current at pin VCO is determined by the amplifier transconductance and the differential voltage on input pins I+ and I-. The output current IVCO is fed to the IRS input of the current-controlled oscillator. The source capability of the error amplifier increases current in the IRS pin when the differential input voltage is positive. Therefore the minimum current is determined by resistor Rf(min) and the minimum frequency setting is independent of the characteristics of the error amplifier. The error amplifier has a maximum output current of 0.5 mA for an output voltage up to 2.5 V. If the source current decreases, the oscillator frequency also decreases resulting in a higher regulated output voltage. During start-up, the output voltage of the amplifier is held at a constant value of 2.5 V. This voltage level defines, together with resistor R∆f, the initial switching frequency of the TEA1610 after start-up. 8.7 Shut-down The shut-down input (SD) has an accurate threshold level of 2.33 V. When the voltage on input SD reaches 2.33 V, both power switches immediately switch off and the TEA1610 enters shut-down mode. Fig 7. Frequency range f bridge max () f osc max ( ) 2 ---------------------- = T OSC t IRS min () t IFS + = mgw001 fosc 0 IIRS fosc(max) fosc(start) fosc(min) |
Nº de peça semelhante - TEA1610P |
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Descrição semelhante - TEA1610P |
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