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PDF TEA1723BT Data sheet ( Hoja de datos )
| Número de pieza | TEA1723BT | |
| Descripción | HV start-up flyback controller | |
| Fabricantes | NXP Semiconductors | |
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TEA1723BT
HV start-up flyback controller with integrated MOSFET for
11 W applications, 905 Hz burst frequency
Rev. 2.2 — 7 June 2012
Product data sheet
1. Product profile
1.1 General description
The TEA1723 is a small and low cost module Switched Mode Power Supply (SMPS)
controller IC for power applications (up to 11 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 TEA1723, 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 < 25 mW at 230 V (AC) mains input.
1.2 Features and benefits
Power features:
Low power SMPS controller with integrated power switch designed for applications up
to 11 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
Energy Star 2.0 compliant
Jitter function for reduced EMI
1 page  
NXP Semiconductors
TEA1723BT
HV start-up flyback controller with integrated MOSFET for 11 W
5.3 Operating modes
The TEA1723 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.
5.3.1 Constant Voltage with Burst mode (CVB)
At low power, the TEA1723 operates in Burst mode.
Burst mode operates with a VSOURCE = 100 mV, a switching frequency of 22.5 kHz and
burst duty-cycle regulation by sensing the FB voltage.
The TEA1723 features an energy save function that puts the main part of the analogue
blocks in a sleep mode with low supply current in burst mode. The burst mode enables the
energy save mode in the non-switching part of the burst. The IC switches to the nominal
supply just before new burst starts.
Transition from burst mode to CV mode happens at 100 % burst duty cycle: a burst
completely filled with 32 pulses. This 100 % pulse train is identical to the lowest power
level of the CV mode. The TEA1723 changes directly from burst mode to CV mode if the
FB voltage drops below 2.4 V in burst mode.
5.3.2 Constant Voltage mode (CV)
At higher power levels, the TEA1723 operates in CV mode. The output voltage is sensed
by the FB pin and the control keeps the output voltage constant over the power range.
CV mode starts at 22.5 kHz switching frequency and ISOURCEregulation at the VSOURCE
minimum level of 100 mV.
With an increasing power output, the VSOURCE level and the switching frequency are also
increased.
CV mode is exited when the maximum power level is reached. Maximum power occurs at
ISOURCEregulation at the VSOURCE maximum level of 555 mV and a maximum switching
frequency of 50.5 kHz.
TEA1723BT
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 2.2 — 7 June 2012
© NXP B.V. 2012. All rights reserved.
5 of 14
5 Page 
NXP Semiconductors
TEA1723BT
HV start-up flyback controller with integrated MOSFET for 11 W
10. Revision history
Table 6. Revision history
Document ID
Release date
Data sheet status
Change notice
TEA1723BT v.2.2
Modifications:
20120607
Product data sheet
-
• Symbol td(OCP) changed to tPD in table 5 on page 8.
• Data sheet title changed.
TEA1723BT v.2.1
20120515
Product data sheet
-
TEA1723BT v.2
20120508
Product data sheet
-
TEA1723BT v.1
20120124
Preliminary data sheet -
Supersedes
TEA1723BT v.2.1
TEA1723BT v.2
TEA1723BT v.1
-
TEA1723BT
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 2.2 — 7 June 2012
© NXP B.V. 2012. All rights reserved.
11 of 14
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