TEA2019 SGS-Thomson-Microelectronics, TEA2019 Datasheet

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TEA2019

Manufacturer Part Number
TEA2019
Description
Current mode switching power supply control circuit
Manufacturer
SGS-Thomson-Microelectronics
Datasheet

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DESCRIPTION
The TEA2019 is an 14-pin DIP low cost integrated
circuit designed for the control of switch mode
power supplies. It has the same basic functions as
the TEA2018Abut with synchronization capability
by internal PLL. It is particularly suitable for appli-
cations where oscillator synchronization is re-
quired.
.
.
.
.
.
.
.
.
.
PIN CONNECTIONS
August 1992
ERROR AMPLIFIER NON-INVERTING INPUT
DIRECT
SWITCHING TRANSISTOR
POSITIVE AND NEGATIVE OUTPUT CUR-
RENTS UP TO 0.5A
CURRENT LIMITATION
TRANSFORMER DEMAGNETIZATION AND
POWER TRANSISTOR SATURATION SENS-
ING
FULL OVERLOAD AND SHORT-CIRCUIT
PROTECTION
PROPORTIONAL BASE CURRENT DRIVING
LOW STANDBY CURRENT BEFORE START-
ING (1.6mA)
SYNCHRONIZATION CAPABILITY WITH IN-
TERNAL PLL
THERMAL PROTECTION
DEMAGNETIZATION SENSING
DRIVE
POSITIVE SUPPLY VOLTAGE
AUXILIARY OUTPUT SUPPLY
SYNCHRONIZATION INPUT
SATURATION SENSING
OF
THE
OUTPUT
EXTERNAL
POWER SUPPLY CONTROL CIRCUIT
1
2
3
4
5
6
7
CURRENT MODE SWITCHING
Due to its current mode regulation, the TEA2019
facilitates design of power supplies with following
.
features :
.
.
Typical applications : Video Display Units, TV sets,
typewriters, micro-computers and industrial appli-
cations. For more details, see application
note AN406/0591.
High stability regulation loop.
Automatic input voltage feed-forward in dis-
continuous mode fly-back.
Automatic pulse-by-pulse current limitation.
14
13
12
11
10
9
8
ORDER CODE : TEA2019
NEGATIVE SUPPLY (OUTPUT STAGE)
SUBSTRATE
I
GROUND
OSCILLATOR CAPACITOR
OSCILLATOR REFERENCE CURRENT
PLL OUTPUT
C
(Plastic package)
SAMPLE (NEGATIVE)
DIP 14
TEA2019
1/7

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TEA2019 Summary of contents

Page 1

... SYNCHRONIZATION CAPABILITY WITH IN- . TERNAL PLL THERMAL PROTECTION DESCRIPTION The TEA2019 is an 14-pin DIP low cost integrated circuit designed for the control of switch mode power supplies. It has the same basic functions as the TEA2018Abut with synchronization capability by internal PLL particularly suitable for appli- cations where oscillator synchronization is re- quired ...

Page 2

... TEA2019 BLOCK DIAGRAM ABSOLUTE MAXIMUM RATINGS Symbol + V Positive Supply Voltage CC V Auxiliary Output Supply Voltage (aux) – V Negative Supply Voltage CC I (peak) Peak Output Current (duty cycle < 5 Input Current Pins 4 Junction Temperature j T Operating Ambient Temperature Range oper ...

Page 3

... Operating Frequency oper Parameter Parameter + rising falling < CC(start 8V < V < + 14V 1nF) t Parameter Parameter OSC SYN min Parameter Parameter TEA2019 Value Unit 80 C/W Min. Typ. Max. Unit 6 –1 –3 – 6.6 V 4.2 4.9 5.6 V 0.7 1.1 1 1.6 mA –1100 –1000 –880 mV ...

Page 4

... I C The ratio is programmed as follows (Figure 2 4 470 22nF 4 TEA2019 59k 1% 1.5nF 100 47nF V10 V12 Figure 1 : Current Mode Control OSCILLATOR ERROR AMPLIFIER V REF ERROR SIGNAL COMPARATOR I SENSE C OSCILLATOR SAWTOOTH ...

Page 5

... V rising]. CC During this time the TEA2019 draws only 1mA (typically). When the voltage on pin 3 reaches this threshold base drive pulses appear. The energy drawn by these pulses tends to dis- charge the power supply storage capacitor. How- ever a hysteresis of about 1 ...

Page 6

... AN406/0591 for detailed information). In the TEA2019, the power supply of the positive output stage is separated from the main power supply, so that it can be supplied from a lower TYPICAL APPLICATION ...

Page 7

... The Netherlands - Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S. Typ. Max. Min. 0.020 1.65 0.055 0.5 0.25 20 8.5 2.54 15.24 7.1 5.1 3.3 2.54 0.050 2 C system, is granted provided that the system conforms to C Standard Specifications as defined by Philips. TEA2019 b1 E Inches Typ. Max. 0.065 0.020 0.010 0.787 0.335 0.100 0.600 0.280 0.201 0.130 0.100 7/7 ...

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