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PDF TEA2018A Data sheet ( Hoja de datos )
| Número de pieza | TEA2018A | |
| Descripción | CURRENT MODE SWITCHING POWER SUPPLY CONTROL CIRCUIT | |
| Fabricantes | ST Microelectronics | |
| Logotipo |  |
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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
1/7
1 page  
Figure 2
IC
RB
TEA2018A 5
IB
IC
3
Re
0
I B t on(min)
0
SCHEMATICS OF INPUTS AND OUTPUTS
+
E Is
50µA
Vd + 0.1V
V
+
CC
V CC
TEA2018A
COLLECTOR
CURRENT I C
t
BIAS
CURRENT
IB
RB
Re
IC
t
Vo
V CC
DISCH.
OSC.
V ref
1kΩ
Vth H = 0.66 V CC
Vth L = 0.33 V CC
1kΩ
1kΩ
GND
Ic
V CC -
5/7
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet TEA2018A.PDF ] | |
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| Número de pieza | Descripción | Fabricantes |
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