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TEA1721DT Datasheet(PDF) 6 Page - NXP Semiconductors

No. de pieza TEA1721DT
Descripción Electrónicos  HV start-up flyback controller with integrated MOSFET for 5 W applications, 1270 Hz burst frequency
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Fabricante Electrónico  PHILIPS [NXP Semiconductors]
Página de inicio  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

TEA1721DT Datasheet(HTML) 6 Page - NXP Semiconductors

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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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