TEA152x
SMPS ICs for low-power systems
Rev. 04 — 14 September 2010
Product data sheet
1. General description
The TEA152x family STARplug is a Switched Mode Power Supply (SMPS) controller IC
that operates directly from the rectified universal mains. It is implemented in the
high-voltage EZ-HV SOI process, combined with a low-voltage Bipolar Complementary
Metal-Oxide Semiconductor (BiCMOS) process. The device includes a high-voltage
power switch and a circuit for start-up directly from the rectified mains voltage.
A dedicated circuit for valley switching is built in, which makes a very efficient slim-line
electronic power-plug concept possible.
In its most basic version of application, the TEA152x family acts as a voltage source.
Here, no additional secondary electronics are required. A combined voltage and current
source can be realized with minimum costs for external components. Implementation of
the TEA152x family renders an efficient and low cost power supply system.
2. Features and benefits
Designed for general purpose supplies up to 30 W
Integrated power switch:
TEA1520x: 48
Ω;
650 V
TEA1521x: 24
Ω;
650 V
TEA1522x: 12
Ω;
650 V
TEA1523P: 6.5
Ω;
650 V
Operates from universal AC mains supplies (80 V to 276 V)
Adjustable frequency for flexible design
RC oscillator for load insensitive regulation loop constant
Valley switching for minimum switch-on loss
Frequency reduction at low power output makes low standby power possible
(< 100 mW)
Adjustable overcurrent protection
Undervoltage protection
Temperature protection
Short-circuit winding protection
Simple application with both primary and secondary (opto) feedback
Available in DIP8 and SO14 packages
NXP Semiconductors
TEA152x
SMPS ICs for low-power systems
3. Applications
Chargers
Adapters
Set-Top Box (STB)
DVD
CD(R)
TV/monitor standby supplies
PC peripherals
Microcontroller supplies in home applications and small portable equipment, etc.
4. Quick reference data
Table 1.
Symbol
V
drain
R
DSon
Quick reference data
Parameter
voltage on pin DRAIN
drain-source on-state
resistance
TEA1520x
I
source
=
−0.06
A
T
j
= 25
°C
T
j
= 100
°C
TEA1521x
I
source
=
−0.125
A
T
j
= 25
°C
T
j
= 100
°C
TEA1522x
I
source
=
−0.25
A
T
j
= 25
°C
T
j
= 100
°C
TEA1523P
I
source
=
−0.50
A
T
j
= 25
°C
T
j
= 100
°C
V
CC
f
osc
I
drain
supply voltage
oscillator frequency
current on pin DRAIN
V
drain
> 60 V;
no auxiliary supply
continuous
-
-
−0.4
10
-
6.5
9.0
-
100
1.5
7.5
10.0
+40
200
2
Ω
Ω
V
kHz
mA
-
-
12
17
13.8
19.6
Ω
Ω
-
-
24
34
27.6
39.1
Ω
Ω
-
-
48
68
55.2
78.2
Ω
Ω
Conditions
T
j
> 0
°C
Min
−0.4
Typ
-
Max
+650
Unit
V
TEA152X
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 04 — 14 September 2010
2 of 20
NXP Semiconductors
TEA152x
SMPS ICs for low-power systems
5. Ordering information
Table 2.
Ordering information
Package
Name
TEA1520P
TEA1521P
TEA1522P
TEA1523P
TEA1520T
TEA1521T
TEA1522T
DIP8
DIP8
DIP8
DIP8
SO14
SO14
SO14
Description
plastic dual in-line package; 8 leads (300 mil)
plastic dual in-line package; 8 leads (300 mil)
plastic dual in-line package; 8 leads (300 mil)
plastic dual in-line package; 8 leads (300 mil)
plastic small outline package; 14 leads; body width 3.9 mm
plastic small outline package; 14 leads; body width 3.9 mm
plastic small outline package; 14 leads; body width 3.9 mm
Version
SOT97-1
SOT97-1
SOT97-1
SOT97-1
SOT108-1
SOT108-1
SOT108-1
Type number
6. Block diagram
V
CC
1 (1)
SUPPLY
8 (14)
DRAIN
VALLEY
TEA152x
7 (12, 13)
n.c.
GND
2 (2, 3, 4,
5, 9, 10)
LOGIC
100 mV
PWM
stop
3 (6)
6 (11)
RC
OSCILLATOR
THERMAL
SHUTDOWN
PROTECTION
LOGIC
POWER-UP
RESET
SOURCE
low freq
F
1.8
U
blank
overcurrent
4 (7)
REG
2.5 V
0.5 V
10x
short circuit winding
0.75 V
5 (8)
AUX
mgt419
Pin numbers without parenthesis refer to DIP8 packages and within parenthesis refer to SO14 packages.
Fig 1.
Block diagram
TEA152X
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 04 — 14 September 2010
3 of 20
NXP Semiconductors
TEA152x
SMPS ICs for low-power systems
7. Pinning information
7.1 Pinning
V
CC
GND
GND
V
CC
GND
RC
REG
1
2
8
7
DRAIN
n.c.
SOURCE
AUX
GND
GND
RC
REG
1
2
3
4
5
6
7
001aae138
14 DRAIN
13 n.c.
12 n.c.
TEA152xT
11 SOURCE
10 GND
9
8
GND
AUX
TEA152xP
3
4
001aae137
6
5
Fig 2.
Pin configuration DIP8
Fig 3.
Pin configuration SO14
7.2 Pin description
Table 3.
Symbol
V
CC
GND
RC
REG
AUX
SOURCE
n.c.
DRAIN
Pin description
Pin
DIP8
1
2
3
4
5
6
7
8
SO14
1
2, 3, 4,
5, 9, 10
6
7
8
11
12, 13
14
supply voltage
ground
frequency setting
regulation input
input for voltage from the auxiliary winding for timing
(demagnetization)
source of the internal MOS switch
not connected
drain of the internal MOS switch; input for the start-up current
and valley sensing
Description
8. Functional description
The TEA152x family is the heart of a compact flyback converter, with the IC placed at the
primary side. The auxiliary winding of the transformer can be used for indirect feedback to
control the isolated output. This additional winding also powers the IC. A more accurate
control of the output voltage and/or current can be implemented with an additional
secondary sensing circuit and optocoupler feedback.
The TEA152x family uses voltage mode control. The frequency is determined by the
maximum transformer demagnetizing time and the time of the oscillator. In the first case,
the converter operates in the Self-Oscillating Power Supply (SOPS) mode. In the latter
case, it operates at a constant frequency, which can be adjusted with external
TEA152X
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 04 — 14 September 2010
4 of 20
NXP Semiconductors
TEA152x
SMPS ICs for low-power systems
components R
RC
and C
RC
. This mode is called Pulse Width Modulation (PWM).
Furthermore, a primary stroke is started only in a valley of the secondary ringing. This
valley switching principle minimizes capacitive switch-on losses.
8.1 Start-up and Underoltage lockout
Initially, the IC is self supplying from the rectified mains voltage. The IC starts switching as
soon as the voltage on pin V
CC
passes the V
CC(startup)
level. The supply is taken over by
the auxiliary winding of the transformer as soon as V
CC
is high enough and the supply
from the line is stopped for high efficiency operation.
When for some reason the auxiliary supply is not sufficient, the high-voltage supply also
supplies the IC. As soon as the voltage on pin V
CC
drops below the V
CC(stop)
level, the IC
stops switching and restarts from the rectified mains voltage.
8.2 Oscillator
The frequency of the oscillator is set by the external resistor and capacitor on pin RC. The
external capacitor is charged rapidly to the V
RC(max)
level and, starting from a new primary
stroke, it discharges to the V
RC(min)
level. Because the discharge is exponential, the
relative sensitivity of the duty factor to the regulation voltage at low duty factor is almost
equal to the sensitivity at high duty factors. This results in a more constant gain over the
duty factor range compared to PWM systems with a linear sawtooth oscillator. Stable
operation at low duty factors is easily realized. For high efficiency, the frequency is
reduced as soon as the duty factor drops below a certain value. This is accomplished by
increasing the oscillator charge time.
To ensure that the capacitor can be charged within the charge time, the value of the
oscillator capacitor should be limited to approximately 1 nF.
8.3 Duty factor control
The duty factor is controlled by the internal regulation voltage and the oscillator signal on
pin RC. The internal regulation voltage is equal to the external regulation voltage (−2.5 V)
multiplied by the gain of the error amplifier (typically 20 dB which is 10×).
8.4 Valley switching
A new cycle is started when the primary switch is switched on (see
Figure 4).
After a
certain time (determined by the oscillator voltage RC and the internal regulation level), the
switch is turned off and the secondary stroke starts. The internal regulation level is
determined by the voltage on pin REG.
After the secondary stroke, the drain voltage shows an oscillation with a frequency of
approximately:
1
---------------------------------------------
-
2
× π × (
L
p
×
C
p
)
where:
L
p
= primary self-inductance
C
p
= parasitic capacitance on drain node
TEA152X
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2010. All rights reserved.
(1)
Product data sheet
Rev. 04 — 14 September 2010
5 of 20
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