UM10520
TEA1721 isolated 3-phase universal mains flyback converter
demo board
Rev. 1.2 — 15 May 2013
User manual
Document information
Info
Keywords
Abstract
Content
TEA1721, isolated, 3-phase universal mains, AC/DC conversion, flyback
converter, Switched Mode Power Supply (SMPS)
This user manual describes the application of the TEA1721ADB1062
demo board. The demo board is designed as an isolated 24 V, 5 V and
3.3 V AC/DC SMPS for supplying up to 5 W into a load.
NXP Semiconductors
UM10520
Isolated 3-phase universal mains flyback converter demo board
Revision history
Rev
v.1.2
Date
20130515
Description
updated issue
Figure 5 “TEA1721 3-phase SMPS circuit diagram”
has been updated.
updated issue
first issue
Modifications:
v.1.1
v.1
20130501
20120123
Contact information
For more information, please visit:
http://www.nxp.com
For sales office addresses, please send an email to:
salesaddresses@nxp.com
UM10520
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2013. All rights reserved.
User manual
Rev. 1.2 — 15 May 2013
2 of 17
NXP Semiconductors
UM10520
Isolated 3-phase universal mains flyback converter demo board
1. Introduction
WARNING
Lethal voltage and fire ignition hazard
The non-insulated high voltages that are present when operating this product, constitute a
risk of electric shock, personal injury, death and/or ignition of fire.
This product is intended for evaluation purposes only. It shall be operated in a designated test
area by personnel qualified according to local requirements and labor laws to work with
non-insulated mains voltages and high-voltage circuits. This product shall never be operated
unattended.
This user manual describes the application of the TEA1721ADB1062 demo board. The
demo board is designed as an isolated 24 V, 5 V and 3.3 V AC/DC SMPS for supplying up
to 5 W to a load.
On the input side, single phase, 2-phase or 3-phase Universal Mains power can be
connected. The switch-mode converter operates in flyback mode at a maximum
frequency of around 50 kHz. Overcurrent and short-circuit protection are built in. The
power consumption is below 50 mW under no-load conditions.
EMI filtering and surge protection using TVS diodes is implemented in this circuit. This
application is intended as a 3-phase low-power SMPS which is especially suited for
3-phase industrial and multi-phase e-metering SMPS applications.
Do not exceed an RMS input voltage of 560 V (AC) across any combination of the J1.x
connectors. 560 V (AC) corresponds to a maximum instantaneous voltage difference of
800 V.
An additional high surge protection using MOVs can be implemented if necessary.
1.1 Features and benefits
•
•
•
•
•
•
•
Compatible with 3-phase universal mains
Tolerant with respect to “missing neutral”
Inrush current limitation
EMI filtering to meet EMC requirements of EN55022
ESD protection on the TEA1721
Optional high-surge protection companion circuit option
Power Line Communication (PLC) decoupling extension
UM10520
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2013. All rights reserved.
User manual
Rev. 1.2 — 15 May 2013
3 of 17
NXP Semiconductors
UM10520
Isolated 3-phase universal mains flyback converter demo board
2. Safety warning
The demo board is powered by AC mains voltage. Avoid touching the board when power
is applied. An isolated housing is obligatory when used in uncontrolled, non-laboratory
environments. Always provide galvanic isolation of the mains phase using a variable
transformer. The following symbols identify isolated and non-isolated devices.
019aab173
019aab174
a. Isolated
Fig 1.
Isolated and non-isolated symbols
b. Non-isolated
UM10520
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2013. All rights reserved.
User manual
Rev. 1.2 — 15 May 2013
4 of 17
NXP Semiconductors
UM10520
Isolated 3-phase universal mains flyback converter demo board
3. Specification
Table 1.
Parameter
AC line input voltage
Demo board specification
Value
single-phase:
85 V (AC) to 560 V (AC)
2-phase or 3-phase:
50 V (AC) to 320 V (AC)
[1]
assuming 120 phase angle. The Phase and the Neutral
wires from the mains utility system can be connected
randomly to the J1.x terminals.
supplied from connectors:
J2.1 = 24 V, GND
J2.2 = 5 V
J2.3 = 3.3 V
J2.4 = 0 V, GND
maximum output current
24 V = 200 mA
5 V = 300 mA
3.3 V = 300 mA
maximum output power
output voltage accuracy
output voltage stability
efficiency
operating temperature
EMC Compliance
board dimensions
[1]
Comment
supplied to any pair of the J1.x terminals
output voltage
24 V (DC), 5 V (DC) and
3.3 V (DC)
5W
5
%
5
%
76.7 % at 115 V/60 Hz
79.6 % 230 V/50 Hz
40 C
to 85
C
EN 55022
82 mm
62 mm
35 mm
L
B
H
depends primarily on the accuracy of the secondary
winding construction of transformer T1
strongly depends on the magnetic coupling of the
secondary and auxiliary winding of transformer T1
Each phase, measured between the neutral and the phase wire
UM10520
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2013. All rights reserved.
User manual
Rev. 1.2 — 15 May 2013
5 of 17
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