CONTROL CIRCUIT. TEA2018A Datasheet

TEA2018A CIRCUIT. Datasheet pdf. Equivalent

Part TEA2018A
Description CURRENT MODE SWITCHING POWER SUPPLY CONTROL CIRCUIT
Feature TEA2018A CURRENT MODE SWITCHING POWER SUPPLY CONTROL CIRCUIT . . . . . . . . . . . DIRECT DRIVE OF.
Manufacture ST Microelectronics
Datasheet
Download TEA2018A Datasheet

TEA2018A CURRENT MODE SWITCHING POWER SUPPLY CONTROL CIRCUIT TEA2018A Datasheet
Recommendation Recommendation Datasheet TEA2018A Datasheet




TEA2018A
TEA2018A
CURRENT MODE SWITCHING
POWER SUPPLY CONTROL CIRCUIT
. DIRECT DRIVE OF THE EXTERNAL
SWITCHING TRANSISTOR
. POSITIVE AND NEGATIVE OUTPUT CUR-
RENTS UP TO 0.5 A
. CURRENT LIMITATION
. TRANSFORMER DEMAGNETIZATION
SENSING
. FULL OVERLOAD AND SHORT-CIRCUIT
PROTECTION
. PROPORTIONAL BASE CURRENT DRIVING
. LOW STANDBY CURRENT BEFORE START-
ING (< 1.6 mA)
. THERMAL PROTECTION
DESCRIPTION
The TEA2018A is an 8-pin DIP low-cost integrated
circuit designed for the control of switch mode
power supplies.
Due to its current mode regulation, the TEA2018A
facilitates design of power supplies with following
features :
. High stability regulation loop
. Automatic input voltage feed-forward in dis-
continuous mode fly-back
. Automatic pulse-by-pulse current limitation
Typical applications : Video Display Units, TV sets,
typewriters, microcomputers and industrialapplica-
tions
Where synchronization is required, use the
TEA2019. For more details, see application
note AN406/0591
PIN CONNECTIONS
DIP8
(Plastic Package)
ORDER CODE : TEA2018A
OSCILLATOR
GROUND
COLLECTOR CURRENT SENSING
NEGATIVE SUPPLY VOLTAGE
1
2
3
4
8 ERROR AMPLIFIER NON-INVERTING INPUT
7 DEMAGNETIZATION SENSING
6 POSITIVE SUPPLY VOLTAGE
5 OUTPUT
May 1993
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TEA2018A
TEA2018A
BLOCK DIAGRAM
TEA2018A
IS 7
DEMAGNETIZATION
SENSING
0.1V
VCC
6
INTERNAL
BIAS
VCC
MONITORING
VCC
” Good”
V REF
2.4V
Undervoltage
Rt Ct 1
OSCILLATOR
MAXIMUM
DUTY CYCLE
70%
COMPARATOR
8
G 50
2.4V
-1V
VOLTAGE
LIMITATION
&
FLIP-FLOP
&
1
THERMAL
SHUTDOWN
Ic
RECOPY
DELAY
500ns
1
5 OUTPUT
3
I SENSE
2
GROUND
4
V CC
ABSOLUTE MAXIMUM RATINGS
Symbol
VCC+
VCC-
IO(peak)
II
Tj
Toper
Tstg
Parameter
Positive Supply Voltage
Negative Supply Voltage
Peak Output Current (duty cycle < 5%)
Input Current (Pin 3)
Junction Temperature
Operating Ambient Temperature Range
Storage Temperature Range
Value
15
-5
±1
±5
+150
-20, +70
-40, +150
Unit
V
V
A
mA
oC
oC
oC
THERMAL DATA
Symbol
Rth (j-a)
Parameter
Junction-ambient Thermal Resistance
Value
80
Unit
oC/W
ELECTRICAL OPERATING CHARACTERISTICS
Tamb = 25oC, potentials referenced to ground (unless otherwise specified) (see test circuit)
Symbol
VCC+
VCC-
VCC(start)
VCC(stop)
Parameter
Positive Supply Voltage
Negative Supply Voltage
Minimum Positive Supply Voltage required for starting (VCC+ rising)
Minimum Positive Voltage below wich device stops operating (VCC+ falling)
Min.
6.6
-1
4.2
Typ.
8
-3
6
4.9
Max.
15
-5
6.6
5.6
Unit
V
V
V
V
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