TEA2018A
CURRENT MODE SWITCHING POWER SUPPLY CONTROL CIRCUIT
. . . . . . . . . . .
DIRECT DRIVE OF THE EXTERNAL SWITCH...
TEA2018A
CURRENT MODE SWITCHING POWER SUPPLY CONTROL CIRCUIT
. . . . . . . . . . .
DIRECT DRIVE OF THE EXTERNAL SWITCHING
TRANSISTOR POSITIVE AND NEGATIVE OUTPUT CURRENTS UP TO 0.5 A CURRENT LIMITATION TRANSFORMER DEMAGNETIZATION SENSING FULL OVERLOAD AND SHORT-CIRCUIT PROTECTION PROPORTIONAL BASE CURRENT DRIVING LOW STANDBY CURRENT BEFORE STARTING (< 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 discontinuous mode fly-back Automatic pulse-by-pulse current limitation Typical applications : Video Display Units, TV sets, typewriters, microcomputers and industrialapplications 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 7 6 5
ERROR AMPLIFIER NON-INVERTING INPUT DEMAGNETIZATION SENSING POSITIVE SUPPLY VOLTAGE
2018A-01.EPS
OUTPUT
May 1993
1/7
TEA2018A
BLOCK DIAGRAM
VCC 6
TEA2018A
IS 7 DEMAGNETIZATION SENSING
V CC INTERNAL BIAS MONITORING
V REF 2.4V
0.1V
VCC ”Good”
Undervoltage
Rt
Ct 1
OSCILLATOR
& FLIP-FLOP
Ic RECOPY 5 OUTPUT DELAY 500ns 1
MAXIMUM DUTY CYCLE 70%
& 1
COMPARATOR 8 G ≅...