Philips TEA1541 User Manual

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TEA1541

SMPS control IC with synchronization function

Product speciﬁcation 2003 Aug 11

Philips Semiconductors Product speciﬁcation

SMPS control IC with synchronization function

CONTENTS

1 FEATURES

1.1 Distinctive features

1.2 Green features

1.3 Protection features 2 GENERAL DESCRIPTION 3 ORDERING INFORMATION 4 BLOCK DIAGRAM 5 PINNING 6 FUNCTIONAL DESCRIPTION

6.1 Start-up, mains voltage-dependent operation-enabling level and undervoltage lock-out

6.2 Supply management

6.3 Primary current regulation

6.4 Oscillator

6.5 Demagnetization

6.6 Minimum and maximum ‘on-time’

6.7 Overvoltage protection

6.8 Overcurrent protection and overpower protection

6.9 Soft start

6.10 Winding short-circuit protection

6.11 Overtemperature protection

6.12 Burst standby mode

6.13 Driver

TEA1541

7 LIMITING VALUES 8 THERMAL CHARACTERISTICS 9 QUALITY SPECIFICATION 10 CHARACTERISTICS 11 APPLICATION INFORMATION 12 PACKAGE OUTLINE 13 SOLDERING

13.1 Introduction to soldering through-hole mount packages

13.2 Soldering by dipping or by solder wave

13.3 Manual soldering

13.4 Suitability of through-hole mount IC packages for dipping and wave soldering methods

14 DATA SHEET STATUS 15 DEFINITIONS 16 DISCLAIMERS

2003 Aug 11 2

Philips Semiconductors Product speciﬁcation

SMPS control IC with synchronization function

1 FEATURES

1.1 Distinctive features

• Universal mains supply operation (70 to 276 V AC)

• High-level of integration requiring few external

components

• Synchronization with internal frequency divider

• Frequency independent over-power protection.

1.2 Green features

• Frequency reductionat low power standby for improved system efficiency (<3 W)

• Burst mode operation for very low power standby levels (<1 W)

• On-chip start-up current source.

1.3 Protection features

• Safe restart mode for system fault conditions

• Continuous mode protection using demagnetization

detection (zero switch-on current)

• Accurate and adjustable overvoltage protection

• Winding short-circuit protection

• Undervoltage protection (foldback during overload)

• Overtemperature protection

• Adjustable low overcurrent protection (OCP) trip level

• Soft (re)start

• Mains voltage-dependent operation-enabling level.

TEA1541

2 GENERAL DESCRIPTION

The TEA1541 is a second generation GreenChip Switched Mode Power Supply (SMPS) controller IC that operates directly from the rectified universal mains. A high-level of integration provides a cost-effective power supply requiring only a few external components.

The TEA1541 controller enables easy design of highly efficient, reliable switched mode power supplies. Its internal oscillator can be synchronized to pulses from an external signal source. External synchronizing pulses whose frequency is above the SMPS switching frequency range are divided by an internal divider.

Special built-in green functions ensure optimum efficiency at all power levels. At low power (standby) levels, the SMPS supply operates at a lower frequency. In burst standbymode, power consumptioncan be reducedto less than 1 W.

The proprietary EZ-HV SOI process allows start-up directly from the rectified mains voltage,avoiding the need for bleeder circuits, and also saves energy.

A low voltage BICMOS implements accurate control and high speed protection functions.

(1) GreenChip is a trademark of Koninklijke Philips

Electronics N.V.

TM(1)

3 ORDERING INFORMATION

TYPE

NUMBER

TEA1541P DIP8 plastic dual-in-line package; 8 leads (300 mil) SOT97-1

2003 Aug 11 3

NAME DESCRIPTION VERSION

PACKAGE

Philips Semiconductors Product speciﬁcation

SMPS control IC with synchronization function

handbook, full pagewidth

mains

Sync

pulses

VCC

TEA1541P

DEM

TEA1541

VIN

n.c.

MDB082

Fig.1 Basic application.

2003 Aug 11 4

Philips Semiconductors Product speciﬁcation

SMPS control IC with synchronization function

4 BLOCK DIAGRAM

(internal

control)

PRIMARY

CURRENT

PCS

HVS

SIMULATION

VIN

SOURCE

CURRENT

START-UP

Clamp

DEM

−50 mV

DEM

100 mV

PROTECTION

OVERVOLTAGE

DRIVER

TEA1541

sense

MDB083

soft

start

PROTECTION

OVERPOWER

(frequency

880 mV

information)

LEB

blank

short-

circuit

winding

OCP

700 mV

SUPPLY

MANAGEMENT

mains ok

DEM

SHORT-CIRCUIT

UVLO start

supply

internal

OCP

PROTECTION

MODE

PROTECTION

CONTINUOUS

(frequency

VOLTAGE

OSCILLATOR

CONTROLLED

CTRL

information)

CONTROL

FREQUENCY

SYNC.

DETECTOR

LOGIC

PCS

control)

(internal

OCP

OVER-

PROTECTION

TEMPERATURE

control)

(internal

SAMPLE-

AND-HOLD

UVLO

RESET

POWER-ON

3.5 V

BURST

CONTROL

burst

detect

ON-TIME

MAXIMUM

PROTECTION

(frequency

information)

TEA1541

handbook, full pagewidth

Fig.2 Block diagram.

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2003 Aug 11 5

GND

CTRL

Philips Semiconductors Product speciﬁcation

SMPS control IC with synchronization function

5 PINNING

SYMBOL PIN DESCRIPTION

GND 2 ground CTRL 3 control input DEM 4 input from auxiliary winding

sense

DRIVER 6 gate driver output HVS 7 high voltage safety spacer,

VIN 8 input for start-up current and

6 FUNCTIONAL DESCRIPTION

The TEA1541 is intended as the controller for a compact flyback converter for CRT monitor applications. The IC is situated on the primary side of the output transformer. Output power is determined by the current in the primary winding. The voltage across an auxiliary winding in the transformer is converted to a current by resistor R used by theIC to derive the current in theprimary winding. This winding is also used for continuous mode protection, overvoltage protection, and to power the IC after start-up.

The IC can operate in either synchronized or unsynchronized mode. In synchronized mode, the IC synchronizes the converter switching frequency to the monitor line frequency to prevent interference. Line synchronizing pulses are applied to pin CTRL.

1 supply voltage

for demagnetization timing, OVP and overpower protection (OPP)

5 programmablecurrent sense

input

not connected

mains voltage recognition

and

DEM

TEA1541

handbook, halfpage

The IC has an internal frequency divider which allows it to operate in synchronized mode at a lower frequency than the synchronizing pulses supplied to pin CTRL by the application. The limited frequency range allows an economical design of the transformer.

In unsynchronized mode, when the power that is drawn from the converter decreases, the converter switching frequency also decreases. At very low power (standby) levels, the frequency of the VCO decreases from 25 kHz to the minimumvalue of approximately 6 kHz as shown by the slope of Fig.4. In a typical application it is possible to obtain an input power of less than 3 W with an output power of 100 mW.

GND

CTRL

DEM

TEA1541P

3 4

MDB084

Fig.3 Pin configuration.

8 7 6 5

VIN HVS DRIVER I

sense

Each operating cycle of the convertercomprises a primary stroke followed by a secondary stroke. During the primary stroke, current flows in the primary winding. The secondary stroke transfers the energy stored in the transformer core to the secondary winding. In either synchronized or unsynchronized mode, the primary stroke only starts at the end of the secondary stroke when the transformer is demagnetized to ensure zero switching primary current. If no synchronizing pulses are present (unsynchronized mode), the IC will operate at its minimum switching frequency.

2003 Aug 11 6

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