Datasheet

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1. Product profile

1.1 General description

The TEA1721 is a small and low cost module Switched Mode Power Supply (SMPS)

controller IC for low power applications (up to 5 W) and operates directly from the rectified

universal mains input. The device includes a high voltage power switch (700 V) and has

been optimized for flyback converter topologies to provide high-efficiency over the entire

load range with ultra-low power consumption in the no-load condition. It provides a circuit

for start-up directly from the rectified mains voltage without any external bleeder circuits.

The converter operates as a regulated voltage source from no-load up to the maximum

output current and operates as current source that delivers the maximum current over a

broad output voltage range. Using the TEA1721, a low power converter can be built at

minimum cost and with the minimum number of external components.

The controller regulates the output voltage with primary-side sensing which eliminates the

need for an additional secondary feedback circuitry and simplifies the design. At higher

power levels, a frequency and current control mode is used. It operates with burst mode

control at low power levels and no-load condition. The burst mode minimizes audible

noise and provides an energy saver state which reduces the power consumption in

no-load condition. The Burst mode frequency of 905 Hz enables no-load power

consumption below < 20 mW at high mains input.

1.2 Features and benefits

Power features:

 Low power SMPS controller with integrated power switch designed for applications up

to 5 W

 700 V high voltage power switch for global mains operation

 Primary sensing for control of the output voltage without optocoupler and secondary

feedback circuitry

 Minimizes audible noise in all operation modes

 USB battery charging and Energy Star 2.0 compliant

 Jitter function for reduced EMI

TEA1721BT

HV start-up flyback controller with integrated MOSFET for 5 W

applications, 905 Hz burst frequency

Rev. 2.1 — 7 June 2012 Product data sheet

Summary of content (14 pages)

PAGE 1
TEA1721BT HV start-up flyback controller with integrated MOSFET for 5 W applications, 905 Hz burst frequency Rev. 2.1 — 7 June 2012 Product data sheet 1. Product profile 1.1 General description The TEA1721 is a small and low cost module Switched Mode Power Supply (SMPS) controller IC for low power applications (up to 5 W) and operates directly from the rectified universal mains input.
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TEA1721BT NXP Semiconductors HV start-up flyback controller with integrated MOSFET for 5 W Green features:  Enables no-load power consumption < 20 mW  Very low supply current in no-load condition with energy saver mode  Incorporates a high voltage start-up circuit with zero current consumption under normal switching operation  Available in halogen-free and Restriction of Hazardous Substances (RoHS) SO7 package Protective functions:  OverVoltage Protection (OVP) on Feedback control (FB) pin with auto
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TEA1721BT NXP Semiconductors HV start-up flyback controller with integrated MOSFET for 5 W 2. Ordering information Table 2. Ordering information Type number Package TEA1721BT/N1 Name Description Version SO7 plastic small outline package; 7 leads; body width 3.9 mm SOT1175-1 3. Block diagram 3.
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TEA1721BT NXP Semiconductors HV start-up flyback controller with integrated MOSFET for 5 W 4. Pinning information 4.1 Pinning 7 DRAIN 3 6 SOURCE 4 5 VCC GND1 1 GND2 2 GND3 FB TEA1721 001aan294 Fig 2. Pinning top view 4.
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TEA1721BT NXP Semiconductors HV start-up flyback controller with integrated MOSFET for 5 W 5.3 Operating modes The TEA1721 operates in three modes, one of which is active at the time. The three modes in order of decreasing load impedance are: • CVB: Constant Voltage with Burst mode • CV: Constant Voltage mode • CC: Constant Current mode The converter acts as a voltage source in CVB and CV modes. The converter acts as a current source in CC mode. 5.3.
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TEA1721BT NXP Semiconductors 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.
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TEA1721BT NXP Semiconductors HV start-up flyback controller with integrated MOSFET for 5 W 6. Limiting values Table 3. Limiting values In accordance with the Absolute Maximum Rating System (IEC 60134).
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TEA1721BT NXP Semiconductors HV start-up flyback controller with integrated MOSFET for 5 W 8. Characteristics Table 5. Characteristics VCC = 20 V; VFB = 0 V; Rsource = 1.5 Ω; Tj-switch = 25 °C; Tj-controller = 25 °C; all voltages referenced to GND, positive currents flow into the IC, unless otherwise specified. Symbol Parameter Conditions Min Typ Max Unit Supply (Pin: VCC) ICC(startup)0V start-up supply current VCC = 0 V -1.6 -1.2 -0.
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TEA1721BT NXP Semiconductors HV start-up flyback controller with integrated MOSFET for 5 W Table 5. Characteristics …continued VCC = 20 V; VFB = 0 V; Rsource = 1.5 Ω; Tj-switch = 25 °C; Tj-controller = 25 °C; all voltages referenced to GND, positive currents flow into the IC, unless otherwise specified.
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TEA1721BT NXP Semiconductors HV start-up flyback controller with integrated MOSFET for 5 W 9. Package outline SO7: plastic small outline package; 7 leads; body width 3.9 mm SOT1175-1 D A E X c HE y v A Z 7 5 Q A2 A A1 A3 θ pin 1 index Lp L 1 4 detail X e w bp 0 2.5 5 mm scale Dimensions Unit mm A A1 A2 A3 bp c 0.49 0.25 max 1.75 0.250 1.45 0.175 1.35 0.25 0.40 0.20 nom 0.100 1.25 0.36 0.19 min D E 5.0 4.9 4.8 4.0 3.9 3.8 e HE 1.27 6.2 6.0 5.8 L Lp 1.05 1.0 0.7 0.
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TEA1721BT NXP Semiconductors HV start-up flyback controller with integrated MOSFET for 5 W 10. Revision history Table 6. Revision history Document ID Release date Data sheet status Change notice Supersedes TEA1721BT v.2.1 20120607 Product data sheet - TEA1721BT v.2 Modifications: • • Symbol td(OCP) changed to tPD in table 5 on page 8. Data sheet title changed. TEA1721BT v.2 20120507 Product data sheet - TEA1721BT v.1 TEA1721BT v.
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TEA1721BT NXP Semiconductors HV start-up flyback controller with integrated MOSFET for 5 W 11. Legal information 11.1 Data sheet status Document status[1] [2] Product status[3] Definition Objective [short] data sheet Development This document contains data from the objective specification for product development. Preliminary [short] data sheet Qualification This document contains data from the preliminary specification.
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TEA1721BT NXP Semiconductors HV start-up flyback controller with integrated MOSFET for 5 W Terms and conditions of commercial sale — NXP Semiconductors products are sold subject to the general terms and conditions of commercial sale, as published athttp://www.nxp.com/profile/terms, unless otherwise agreed in a valid written individual agreement. In case an individual agreement is concluded only the terms and conditions of the respective agreement shall apply.
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TEA1721BT NXP Semiconductors HV start-up flyback controller with integrated MOSFET for 5 W 13. Contents 1 1.1 1.2 1.3 1.4 2 3 3.1 4 4.1 4.2 5 5.1 5.2 5.3 5.4 5.3.1 5.3.2 5.3.3 6 7 8 9 10 11 11.1 11.2 11.3 11.4 12 Product profile . . . . . . . . . . . . . . . . . . . . . . . . . . .1 General description . . . . . . . . . . . . . . . . . . . . . .1 Features and benefits . . . . . . . . . . . . . . . . . . . . .1 Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 Quick reference data . .