TEA1723AT Datasheet PDF - NXP

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TEA1723AT
NXP

Part Number TEA1723AT
Description HV start-up flyback controller
Page 14 Pages


TEA1723AT datasheet pdf
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TEA1723AT
HV start-up flyback controller with integrated MOSFET for
11 W applications, 430 Hz burst frequency
Rev. 2.1 — 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 430 Hz enables no-load power
consumption < 12 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



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TEA1723AT
HV start-up flyback controller with integrated MOSFET for 11 W
Green features:
Enables no-load power consumption below < 12 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-restart
UnderVoltage LockOut (UVLO) protection on IC supply pin
OverTemperature Protection (OTP)
Soft-start by reduced peak current for zero and low output voltage
Demagnetization protection for guaranteed discontinuous conduction mode operation
Open and short-circuit protection of the Feedback control (FB) pin
Short-circuit protection of the charger output
1.3 Applications
Battery chargers for cellular phones, tablet pc and other power adapters up to 11 W
Standby supply for TV, desktop PC and set-top boxes
Power supply for white goods applications
1.4 Quick reference data
Table 1. Quick reference data
Symbol Parameter
Conditions
Power switch (Pin: DRAIN)
RDSon
drain-source
on-state
resistance
Ids = 30 mA; Tj = 25 °C
Oscillator (Pins: DRAIN and SOURCE)
fburst
burst frequency burst frequency in CVB mode,
without jitter
fosc-high
oscillator
frequency High
maximum switching frequency
in CV and CC mode, without
jitter
Supply (Pin: VCC)
VCC(startup) start-up supply
voltage
VCC(stop)
stop supply
voltage
undervoltage lockout of IC
Min Typ Max Unit
3.5 4.8 6
390 430 470 Hz
48 50.5 53 kHz
15 17 19 V
7.5 8.5 9.5 V
TEA1723AT
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 2.1 — 7 June 2012
© NXP B.V. 2012. All rights reserved.
2 of 14



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NXP Semiconductors
TEA1723AT
HV start-up flyback controller with integrated MOSFET for 11 W
2. Ordering information
Table 2. Ordering information
Type number
Package
Name
TEA1723AT/N1
SO7
3. Block diagram
Description
plastic small outline package; 7 leads; body width 3.9 mm
3.1 Block diagram
Version
SOT1175-1
VCC
FB
GND
START
STOP enable
REFERENCES
AND
TEMPERATURE
PROTECTION
OTP
Vref
VFBS
SENSOR
demag
controller and cable
VOVP(FBS) compensation
fosc,
VSOURCE AND
JITTER
REGULATOR
start-up source
BURST
REGULATOR
OSCILLATOR
fburst
driver
fSW CONTROL
LOGIC
power
switch
VSOURCE
comparator
TEA1723
Vpeak
DRAIN
SOURCE
Fig 1. Block diagram
001aao250
TEA1723AT
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 2.1 — 7 June 2012
© NXP B.V. 2012. All rights reserved.
3 of 14



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4. Pinning information
4.1 Pinning
TEA1723AT
HV start-up flyback controller with integrated MOSFET for 11 W
Fig 2. Pinning top view
GND1 1
GND2 2
GND3 3
FB 4
7 DRAIN
TEA1723
6 SOURCE
5 VCC
001aao249
4.2 Pin description
Pin Pin name
1 GND1
2 GND2
3 GND3
4 FB
5 VCC
6 SOURCE
7 DRAIN
--
I/O type
I
I
O
I
Pin description
ground
ground
ground
feedback input for voltage sensing
supply input
source for power switch
drain of power switch
high voltage spacer
5. Functional description
5.1 Start-up
The TEA1723 starts up by charging the VCC capacitor until the VCC(start) level. The
charging current flows from the high voltage DRAIN pin via an internal start-up current
source to the VCC pin.
Once the start level has been reached the start-up current source is switched off. During
switching operation, the start-up current source remains current-less and has zero
bleeder loss.
5.2 Primary sensing
The FB input senses the reflected secondary voltage on the primary side. The FB input
has a sample and hold function that samples the FB voltage on the secondary stroke to
control the output voltage.
The sampled VFBS voltage is the input for the TEA1723’s control loop and defines the
operating mode.
TEA1723AT
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 2.1 — 7 June 2012
© NXP B.V. 2012. All rights reserved.
4 of 14



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