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TEA1521T 데이터시트, 핀배열, 회로
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




TEA1521T pdf, 반도체, 판매, 대치품
NXP Semiconductors
7. Pinning information
7.1 Pinning
TEA152x
SMPS ICs for low-power systems
VCC 1
8 DRAIN
GND 2
7 n.c.
TEA152xP
RC 3
6 SOURCE
REG 4
5 AUX
001aae137
Fig 2. Pin configuration DIP8
VCC 1
GND 2
14 DRAIN
13 n.c.
GND 3
GND 4
12 n.c.
TEA152xT 11 SOURCE
GND 5
10 GND
RC 6
9 GND
REG 7
8 AUX
001aae138
Fig 3. Pin configuration SO14
7.2 Pin description
Table 3.
Symbol
VCC
GND
RC
REG
AUX
Pin description
Pin
DIP8 SO14
11
2 2, 3, 4,
5, 9, 10
36
47
58
SOURCE
n.c.
DRAIN
6
7
8
11
12, 13
14
Description
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
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
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 04 — 14 September 2010
© NXP B.V. 2010. All rights reserved.
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TEA1521T 전자부품, 판매, 대치품
NXP Semiconductors
TEA152x
SMPS ICs for low-power systems
40
phase
(deg)
20
mgt424
0
20
40
0
200 400 600 800
f (kHz)
Fig 5. Typical phase of drain ringing at switch-on (at N × Vo = 80 V)
8.5 Demagnetization
The system operates in discontinuous conduction mode all the time. As long as the
secondary stroke has not ended, the oscillator will not start a new primary stroke. During
the first tsuppr seconds, demagnetization recognition is suppressed. This suppression may
be necessary in applications where the transformer has a large leakage inductance and at
low output voltages.
8.6 Minimum and maximum duty factor
The minimum duty factor of the switched mode power supply is 0 %. The maximum duty
factor is set to 75 % (typical value at 100 kHz oscillation frequency).
8.7 OverCurrent Protection (OCP)
The cycle-by-cycle peak drain current limit circuit uses the external source resistor RI to
measure the current. The circuit is activated after the leading edge blanking time tleb. The
protection circuit limits the source voltage to Vsource(max), and thus limits the primary peak
current.
8.8 Short-circuit winding protection
The short-circuit winding protection circuit is also activated after the leading edge blanking
time. If the source voltage exceeds the short-circuit winding protection voltage Vswp, the IC
stops switching. Only a power-on reset will restart normal operation. The short-circuit
winding protection also protects in case of a secondary diode short circuit.
8.9 OverTemperature Protection (OTP)
An accurate temperature protection is provided in the device. When the junction
temperature exceeds the thermal shutdown temperature, the IC stops switching. During
thermal protection, the IC current is lowered to the start-up current. The IC continues
normal operation as soon as the overtemperature situation has disappeared.
TEA152X
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 04 — 14 September 2010
© NXP B.V. 2010. All rights reserved.
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