Data Sheet

TEA1721AT
HV start-up flyback controller with integrated MOSFET for 5 W
applications, 430 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. 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 430 Hz enables no-load power
consumption below < 10 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
TEA1721AT
NXP Semiconductors
HV start-up flyback controller with integrated MOSFET for 5 W
Green features:
 Enables no-load power consumption below < 10 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 and other low power adapters up to 5 W
 Standby supply for TV and desktop PC
 Power supply for white goods applications
1.4 Quick reference data
Table 1.
Symbol
Quick reference data
Parameter
Conditions
Min
Typ
Max Unit
Ids = 30 mA; Tj = 25 °C
13
15.5 17
Ω
Hz
Power switch (Pin: DRAIN)
RDSon
drain-source
on-state
resistance
Oscillator (Pins: DRAIN and SOURCE)
fburst
burst frequency
burst frequency in CVB mode,
without jitter
390
430
470
fosc-high
oscillator
frequency High
maximum switching frequency
in CV and CC mode, without
jitter
48
50.5 53
kHz
15
17
19
V
7.5
8.5
9.5
V
Supply (Pin: VCC)
TEA1721AT
Product data sheet
VCC(startup)
start-up supply
voltage
VCC(stop)
stop supply
voltage
undervoltage lockout of IC
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Rev. 2.1 — 7 June 2012
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HV start-up flyback controller with integrated MOSFET for 5 W
2. Ordering information
Table 2.
Ordering information
Type number
Package
TEA1721AT/N1
Name
Description
Version
SO7
plastic small outline package; 7 leads; body width 3.9 mm
SOT1175-1
3. Block diagram
3.1 Block diagram
start-up source
VCC
DRAIN
START
STOP
enable
REFERENCES
AND
TEMPERATURE
PROTECTION
OTP
BURST
REGULATOR
Vref
FB
VFBS
SENSOR
demag
fosc,
VSOURCE AND
JITTER
controller and cable REGULATOR
VOVP(FBS)
OSCILLATOR
fburst
fSW
CONTROL
LOGIC
driver
power
switch
compensation
VSOURCE
comparator
SOURCE
GND
Vpeak
TEA1721
001aan293
Fig 1.
Block diagram
TEA1721AT
Product data sheet
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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
4.2 Pin description
Pin
Pin name
I/O type
1
GND1
ground
2
GND2
ground
3
GND3
ground
4
FB
5
VCC
I
supply input
6
SOURCE
O
source for power switch
7
DRAIN
I
drain of power switch
-
-
I
Pin description
feedback input for voltage sensing
high voltage spacer
5. Functional description
5.1 Start-up
The TEA1721 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 TEA1721’s control loop and defines the
operating mode.
TEA1721AT
Product data sheet
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TEA1721AT
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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.
5.3.1 Constant Voltage with Burst mode (CVB)
At low power, the TEA1721 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 TEA1721 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 TEA1721 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 TEA1721 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 ISOURCE regulation 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
ISOURCE regulation at the VSOURCE maximum level of 555 mV and a maximum switching
frequency of 50.5 kHz.
TEA1721AT
Product data sheet
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TEA1721AT
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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.
TEA1721AT
Product data sheet
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TEA1721AT
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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).
Symbol
Parameter
Tamb
Conditions
Min
Max
Unit
ambient temperature
-40
+85
°C
Tj
junction temperature
-40
+150
°C
Tstg
storage temperature
VESD
electrostatic discharge voltage
CDM; all pins
-55
+150
°C
-500
+500
V
HBM; all pins, except pin 7
[1]
-2000
+2000 V
HBM; pin 7
[1]
-1000
+1000 V
Voltages
VDRAIN
voltage on pin DRAIN
-2
+700
V
VSOURCE
voltage on pin SOURCE
-0.3
+5
V
VCC
voltage on pin VCC
-0.3
+35
V
VFB
voltage on pin FB
-20
+5
V
IDRAIN
current on pin DRAIN
-0.1
+0.7
A
ISOURCE
current on pin SOURCE
-0.7
+0.1
A
Currents
[1]
Human body model: equivalent to discharging a 100 pF capacitor through a 1.5 kΩ series resistor.
7. Thermal characteristics
Table 4.
Thermal characteristics
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
Rth(j-a)
thermal resistance
from junction to
ambient
in free air; SO7 package; on open PCB
of 2.2 cm X 2.2 cm; 2-layer; 70 µm Cu
-
136
-
K/W
in free air; SO7 package; on open PCB
of 3 cm X 6 cm; 1-layer; 35 µm Cu
-
136
-
K/W
TEA1721AT
Product data sheet
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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
-0.8
mA
ICC(startup)17V
start-up supply current
VCC = VCC(startup)
-1.6
-0.7
-0.2
mA
ICC(energysave)
supply current in
energy save
VFB = 2.8 V, non-switching
90
130
170
µA
ICC(50kHz)
supply current at 50
kHz
in CC mode
530
750
970
µA
VCC(startup)
start-up supply voltage
15
17
19
V
VCC(stop)
stop supply voltage
7.5
8.5
9.5
V
Totp
overtemperature
protection threshold
temperature on
controller die
140
150
160
°C
Totp(hys)
overtemperature
protection temperature
hysteresis
-
50
-
°C
3.1
3.2
3.3
V
2.5
2.55
2.6
V
undervoltage lockout of IC
Feedback (Pin: FB)
Vth(ovp)fbck
feedback overvoltage
protection threshold
voltage
Vref(fbck)
feedback reference
voltage
Vth(fbck)CV
constant voltage mode in burst mode operation
feedback threshold
voltage
2.35
2.4
2.45
V
Vth(det)demag(fb)
demagnetization
detection voltage level
on FB pin
25
50
75
mV
in CV ode
Oscillator (Pins: DRAIN and SOURCE)
fburst
burst frequency
burst frequency in CVB mode, without
jitter
390
430
470
Hz
fjit/fsw
jitter frequency to
switching frequency
ratio
in all operation modes except in CVB
mode
5
7
9
%
fosc-high
oscillator frequency
High
maximum switching frequency in CV
and CC mode, without jitter
48
50.5
53
kHz
fosc-low
oscillator frequency
Low
minimum switching frequency in CV
and CC mode, without jitter. Switching
frequency in CVB mode
21
22.5
24
kHz
fsweep
jitter sweep frequency
In current source operation
150
200
250
Hz
δmax
maximum duty cycle
72
75
78
%
TEA1721AT
Product data sheet
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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.
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
Power switch (Pin: DRAIN)
Idrain(off)
off-state drain current
VDRAIN = 325 V
-
1
-
µA
RDSon
drain-source on-state
resistance
Tj = 25 °C; Ids = 30 mA
13
15.5
17
Ω
V(BR)DS
drain-source
breakdown voltage
700
-
-
V
Peak current comparator (Pin: SOURCE)
tPD
propagation delay time dV/dt = 0.2 V/µs
-
100
-
ns
tleb
leading edge blanking
time
290
325
360
ns
Vref-peak-high
reference voltage, high maximum peak voltage in CV and CC
peak voltage
modes, without jitter
0.525
0.555
0.585
V
Vref-peak-low
reference voltage, low
peak voltage
in CVB mode
0.085
0.1
0.115
V
Vref-0 V
reference voltage at
start-up or 0 V
feedback voltage
in CC mode with VFBS = 0 V
0.18
0.21
0.24
V
TEA1721AT
Product data sheet
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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
0.4
Q
v
w
0.70
0.67
0.60 0.25 0.25
y
Z
θ
0.1
0.7
0.5
0.3
8°
4°
0°
Note
1. Plastic or metal protrusions of 0.15 mm maximum per side are not included.
2. Plastic interlead protrusions of 0.25 mm maximum per side are not included.
References
Outline
version
IEC
JEDEC
JEITA
SOT1175-1
---
---
---
Fig 3.
sot1175-1_po
European
projection
Issue date
10-03-30
10-04-21
Package outline SOT1175-1 (SO7)
TEA1721AT
Product data sheet
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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
TEA1721AT v.2.1
20120607
Product data sheet
-
TEA1721AT v.2
Modifications:
•
•
Symbol td(OCP) changed to tPD in table 5 on page 8.
Data sheet title changed.
TEA1721AT v.2
20120507
Product data sheet
-
TEA1721AT v.1
TEA1721AT v.1
20120124
Preliminary data sheet
-
-
TEA1721AT
Product data sheet
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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.
Product [short] data sheet
Production
This document contains the product specification.
[1]
Please consult the most recently issued document before initiating or completing a design.
[2]
The term 'short data sheet' is explained in section "Definitions".
[3]
The product status of device(s) described in this document may have changed since this document was published and may differ in case of multiple devices. The latest product
status information is available on the Internet at URLhttp://www.nxp.com.
11.2 Definitions
Preview — The document is a preview version only. The document is still
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Short data sheet — A short data sheet is an extract from a full data sheet
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Notwithstanding any damages that customer might incur for any reason
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customer for the products described herein shall be limited in accordance
with theTerms and conditions of commercial sale of NXP Semiconductors.
TEA1721AT
Product data sheet
Right to make changes — NXP Semiconductors reserves the right to make
changes to information published in this document, including without
limitation specifications and product descriptions, at any time and without
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Quick reference data — The Quick reference data is an extract of the
product data given in the Limiting values and Characteristics sections of this
document, and as such is not complete, exhaustive or legally binding.
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Limiting values — Stress above one or more limiting values (as defined in
the Absolute Maximum Ratings System of IEC 60134) will cause permanent
damage to the device. Limiting values are stress ratings only and (proper)
operation of the device at these or any other conditions above those given in
the Recommended operating conditions section (if present) or the
Characteristics sections of this document is not warranted. Constant or
repeated exposure to limiting values will permanently and irreversibly affect
the quality and reliability of the device.
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andUCODE — are trademarks of NXP B.V.
In the event that customer uses the product for design-in and use in
automotive applications to automotive specifications and standards, customer
(a) shall use the product without NXP Semiconductors’ warranty of the
HD Radio andHD Radio logo — are trademarks of iBiquity Digital
Corporation.
12. Contact information
For more information, please visit:http://www.nxp.com
For sales office addresses, please send an email to:[email protected]
TEA1721AT
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.
13 of 14
TEA1721AT
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 . . . . . . . . . . . . . . . . . . . . .2
Ordering information . . . . . . . . . . . . . . . . . . . . . .3
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Pinning information . . . . . . . . . . . . . . . . . . . . . . .4
Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . .4
Functional description . . . . . . . . . . . . . . . . . . . .4
Start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Primary sensing . . . . . . . . . . . . . . . . . . . . . . . . .4
Operating modes . . . . . . . . . . . . . . . . . . . . . . . .5
Jitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Constant Voltage with Burst mode (CVB). . . . . .5
Constant Voltage mode (CV) . . . . . . . . . . . . . . .5
Constant Current mode (CC) . . . . . . . . . . . . . . .6
Limiting values. . . . . . . . . . . . . . . . . . . . . . . . . . .7
Thermal characteristics . . . . . . . . . . . . . . . . . . .7
Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Package outline . . . . . . . . . . . . . . . . . . . . . . . . .10
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . 11
Legal information. . . . . . . . . . . . . . . . . . . . . . . .12
Data sheet status . . . . . . . . . . . . . . . . . . . . . . .12
Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Disclaimers . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Trademarks. . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Contact information. . . . . . . . . . . . . . . . . . . . . .13
Please be aware that important notices concerning this document and the product(s)
described herein, have been included in section ‘Legal information’.
© NXP B.V. 2012.
All rights reserved.
For more information, please visit: http://www.nxp.com
For sales office addresses, please send an email to: [email protected]
Date of release: 7 June 2012
Document identifier: TEA1721AT
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