INTEGRATED CIRCUITS
DATA SHEET
TEA1533P; TEA1533AP
GreenChip
TM
II SMPS control IC
Product specification
Supersedes data of 2002 May 31
2002 Aug 23
Philips Semiconductors
Product specification
GreenChip
TM
II SMPS control IC
FEATURES
Distinctive features
•
Universal mains supply operation (70 to 276 V AC)
•
High level of integration, giving a very low external
component count.
Green features
•
Valley or zero voltage switching for minimum switching
losses
•
Efficient quasi-resonant operation at high power levels
•
Frequency reduction at low power standby for improved
system efficiency (<3 W)
•
Cycle skipping mode at very low loads. P
i
<300 mW at
no-load operation for a typical adapter application
•
On-chip start-up current source.
Protection features
•
Safe restart mode for system fault conditions
•
Continuous mode protection by means of
demagnetization detection (zero switch-on current)
•
Accurate and adjustable overvoltage protection (latched
in TEA1533P, safe restart in TEA1533AP)
•
Short winding protection
•
Undervoltage protection (foldback during overload)
•
Overtemperature protection (latched in TEA1533P, safe
restart in TEA1533AP)
•
Low and adjustable overcurrent protection trip level
•
Soft (re)start
•
Mains voltage-dependent operation enabling level.
APPLICATIONS
TEA1533P; TEA1533AP
Besides typical application areas, i.e. adapters and
chargers, the device can be used in TV and monitor
supplies and all applications that demand an efficient and
cost-effective solution up to 250 W.
1
2
3
4
8
7
6
5
TEA1533P
TEA1533AP
MGU505
Fig.1 Basic application diagram.
2002 Aug 23
2
Philips Semiconductors
Product specification
GreenChip
TM
II SMPS control IC
GENERAL DESCRIPTION
The GreenChip™
(1)
II is the second generation of green
Switched Mode Power Supply (SMPS) control ICs
operating directly from the rectified universal mains. A high
level of integration leads to a cost effective power supply
with a very low number of external components.
The special built-in green functions allow the efficiency to
be optimum at all power levels. This holds for
quasi-resonant operation at high power levels, as well as
fixed frequency operation with valley switching at medium
power levels. At low power (standby) levels, the system
operates at a reduced frequency and with valley detection.
(1) GreenChip is a trademark of Koninklijke Philips
Electronics N.V.
TEA1533P; TEA1533AP
The proprietary high voltage BCD800 process makes
direct start-up possible from the rectified mains voltage in
an effective and green way. A second low voltage
BICMOS IC is used for accurate, high-speed protection
functions and control.
Highly efficient and reliable supplies can easily be
designed using the GreenChipII control IC.
ORDERING INFORMATION
PACKAGE
TYPE NUMBER
NAME
TEA1533P
TEA1533AP
DIP8
DESCRIPTION
plastic dual in-line package; 8 leads (300 mil)
VERSION
SOT97-1
2002 Aug 23
3
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book, full pagewidth
2002 Aug 23
4
BLOCK DIAGRAM
Philips Semiconductors
GreenChip
TM
II SMPS control IC
VCC
1
SUPPLY
MANAGEMENT
START-UP
CURRENT SOURCE
OCP
Iprot(DEM)
VALLEY
clamp
8
DRAIN
internal
supply
2
S1
M-level
UVLO start
DEMAG
SHORT
PROTECTION
7
4
HVS
n.c.
DEM
GND
VOLTAGE
CONTROLLED
OSCILLATOR
LOGIC
100
mV
50
mV
FREQUENCY
CONTROL
UP/DOWN
COUNTER
OVER-
VOLTAGE
PROTECTION
Iprot(CTRL)
CTRL
3
−1
POWER-ON
RESET
LOGIC
DRIVER
Iss
LEB
6
DRIVER
S
Q
blank
soft
start
S2
0.5 V
2.5 V
burst
detect
OVER-
TEMPERATURE
PROTECTION
UVLO
R
Q
5
OCP
Isense
S
VCC < 4.5 V
or UVLO
(TEA1533AP)
Q
TEA1533P; TEA1533AP
R
Q
TEA1533P
TEA1533AP
MAXIMUM
ON-TIME
PROTECTION
short
winding
0.88 V
OVERPOWER
PROTECTION
MGU506
Product specification
Fig.2 Block diagram.
Philips Semiconductors
Product specification
GreenChip
TM
II SMPS control IC
PINNING
SYMBOL PIN
V
CC
GND
CTRL
DEM
1
2
3
4
ground
control input
input from auxiliary winding for
demagnetization timing, overvoltage
and overpower protection
programmable current sense input
gate driver output
high voltage safety spacer, not
connected
drain of external MOS switch, input for
start-up current and valley sensing
25
f
handbook, halfpage
(kHz)
TEA1533P; TEA1533AP
FUNCTIONAL DESCRIPTION
DESCRIPTION
supply voltage
The TEA1533 is the controller of a compact flyback
converter, and is situated at the primary side. An auxiliary
winding of the transformer provides demagnetization
detection and powers the IC after start-up.
The TEA1533 can operate in multi modes (see Fig.4).
I
sense
DRIVER
HVS
DRAIN
5
6
7
8
MGU508
VCO
175
fixed
quasi resonant
P (W)
Fig.4 Multi modes operation.
handbook, halfpage
VCC 1
GND 2
8 DRAIN
7 HVS
TEA1533P
TEA1533AP
6 DRIVER
CTRL 3
DEM 4
MGU507
5 Isense
The next converter stroke is started only after
demagnetization of the transformer current (zero current
switching), while the drain voltage has reached the lowest
voltage to prevent switching losses (green function). The
primary resonant circuit of the primary inductance and
drain capacitor ensures this quasi-resonant operation. The
design can be optimized in such a way that zero voltage
switching can be reached over almost the universal mains
range.
To prevent very high frequency operation at lower loads,
the quasi-resonant operation changes smoothly in fixed
frequency PWM control.
At very low power (standby) levels, the frequency is
controlled down, via the VCO, to a minimum frequency of
approximately 25 kHz.
Start-up, mains enabling operation level and
undervoltage lock-out
Initially, the IC is self supplying from the rectified mains
voltage via pin DRAIN (see Figs 11 and 12). Supply
capacitor C
VCC
is charged by the internal start-up current
source to approximately 4 V or higher, depending on the
voltage on pin DRAIN.
Fig.3 Pin configuration.
2002 Aug 23
5
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