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TEA1721DT Datasheet(PDF) 6 Page - NXP Semiconductors |
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TEA1721DT Datasheet(HTML) 6 Page - NXP Semiconductors |
6 / 14 page TEA1721DT All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved. Product data sheet Rev. 2.1 — 7 June 2012 6 of 14 NXP Semiconductors TEA1721DT HV start-up flyback controller with integrated MOSFET for 5 W 5.3.3 Constant Current mode (CC) The CC mode starts at maximum power delivery and keeps the output current constant for decreasing output voltage. CC mode is enabled when the converter is operating at the maximum switching frequency, with the maximum primary peak current when the FB voltage drops below the regulated level. CC mode operation controlled is by regulation of the switching frequency from 50.5 kHz down to 22.5 kHz and by ISOURCE regulation from the maximum VSOURCE level of 555 mV until level of VSOURCE is 0.21 V. The VSOURCE level of 0.21 V equals the level at start-up with zero output voltage and the output capacitor discharged or on a short-circuit of the charger output. 5.4 Jitter The TEA1721 features a jitter function for ElectroMagnetic Interference (EMI) reduction. The switching frequency is 7 % typical for the spread spectrum. The sweep frequency is a low frequency of approximately 200 Hz. To keep the output power constant, the VSOURCE level is jittered with the opposite polarity. The jitter is active in all operation modes except burst mode. |
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