1.
General description
The TEA1623P; TEA1623PH 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-HVTM SOI process, combined with a low voltage 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 TEA1623P; TEA1623PH 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 TEA1623P; TEA1623PH renders an efficient and low cost power
supply system.
2.
Features
s
Designed for general purpose supplies
s
Integrated power switch: 6.5
and 650 V
s
Operates from universal AC mains supplies: 80 V to 276 V
s
Adjustable frequency for flexible design
s
RC oscillator for load insensitive regulation loop constant
s
Valley switching for minimum switch-on loss
s
Frequency reduction at low power output for low standby power: <100 mW
s
Adjustable overcurrent protection
s
Undervoltage protection
s
Temperature protection
s
Short winding protection
s
Safe restart mode for system fault conditions
s
Simple application with both primary and secondary (opto) feedback
s
Available in 8-pin and 16-pin DIP package.
3.
Applications
TEA1623P; TEA1623PH
STARplug
TM
Rev. 01 -- 17 March 2004
Product data sheet
s
Adapters
s
VCD
s
Set-Top Box (STB)
s
CD(R)
s
DVD
s
PC Silverbox standby SMPS.
9397 750 12579
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Product data sheet
Rev. 01 -- 17 March 2004
2 of 18
Philips Semiconductors
TEA1623P; TEA1623PH
STARplug
TM
4.
Quick reference data
5.
Ordering information
Table 1:
Quick reference data
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
V
CC(max)
maximum supply voltage
-
-
40
V
V
DRAIN(max)
maximum voltage at pin
DRAIN
T
j
> 0
C
-
-
650
V
I
DRAIN
supply current drawn from
pin DRAIN
no auxiliary supply
-
0.5
-
mA
R
DSon
drain-source on-state
resistance
I
SOURCE
=
-
0.5 A
T
j
= 25
C
-
6.5
7.5
T
j
= 100
C
-
9.0
10.0
f
osc
oscillator frequency range
10
-
200
kHz
T
amb
ambient temperature
-
20
-
+85
C
Table 2:
Ordering information
Type number
Package
Name
Description
Version
TEA1623P
DIP8
plastic dual in-line package; 8 leads (300 mil)
SOT97-1
TEA1623PH
DIP16
plastic dual in-line package; 16 leads (300 mil);
long body
SOT38-1
9397 750 12579
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Product data sheet
Rev. 01 -- 17 March 2004
5 of 18
Philips Semiconductors
TEA1623P; TEA1623PH
STARplug
TM
7.2 Pin description
8.
Functional description
The TEA1623P; TEA1623PH 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 TEA1623P; TEA1623PH 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
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 undervoltage lock-out
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(start)
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.
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
Table 3:
Pin description
Symbol
Pin
Description
TEA1623P
TEA1623PH
V
CC
1
3
supply voltage
GND
2
4
ground
RC
3
5
frequency setting
REG
4
6
regulation input
SGND
-
8
signal ground; must preferably be connected to pin GND
AUX
5
11
input for voltage from auxiliary winding for timing
(demagnetization)
SOURCE 6
12
source of internal MOS switch
n.c.
7
1, 2, 7, 9, 10,
13, 15, 16
not connected
DRAIN
8
14
drain of internal MOS switch; input for start-up current
and valley sensing
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