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TEA1610T Folha de dados(PDF) 8 Page - NXP Semiconductors |
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TEA1610T Folha de dados(HTML) 8 Page - NXP Semiconductors |
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8 / 20 page  2001 Apr 25 8 Philips Semiconductors Product specification Zero-voltage-switching resonant converter controller TEA1610P; TEA1610T 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. 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. During shut-down mode, pin VDD is clamped by an internal Zener diode at 12.0 V with 1 mA input current. This clamp prevents VDD rising above the rating of 14 V due to low supply current to the TEA1610 in shut-down mode. When the TEA1610 is in the shut-down mode, it can be activated again only by lowering VDD below the VDD reset level (5.3 V typical). The shut-down latch is then reset and a new start-up cycle can commence (see Fig.8). handbook, full pagewidth MGW002 oscillation shut- down VDD SD GH-SH GL t 0 0 VDD(start) VDD(sdc) VDD(reset) VSD(th) supply off start-up oscillation Fig.8 Shut-down. |
Nº de peça semelhante - TEA1610T |
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Descrição semelhante - TEA1610T |
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