TEA2018 Fast Delivery |IC PHOENIX CO.,LIMITED

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TEA2018
CURRENT MODE SWITCHING POWER SUPPLY CONTROL CIRCUIT
TEA2018A
CURRENT MODE SWITCHING
POWER SUPPLY CONTROL CIRCUIT
OSCILLATOR
GROUND
COLLECTOR CURRENT SENSING
NEGATIVE SUPPLY VOLTAGE
ERROR AMPLIFIER NON-INVERTING INPUT
DEMAGNETIZATION SENSING
POSITIVESUPPLY VOLTAGE
OUTPUT
PIN CONNECTIONS
DIP8
(Plastic Package)
ORDER CODE: TEA2018A
.DIRECT DRIVE OF THE EXTERNAL
SWITCHING TRANSISTOR.POSITIVE AND NEGATIVE OUTPUT CUR-
RENTS UP TO 0.5A.CURRENT LIMITATION.TRANSFORMER DEMAGNETIZATION
SENSING.FULL OVERLOAD AND SHORT-CIRCUIT
PROTECTION .PROPORTIONALBASE CURRENT DRIVING.LOW STANDBY CURRENT BEFORE START-
ING(< 1.6 mA).THERMAL PROTECTION
DESCRIPTION
The TEA2018Aisan 8-pin DIP low-cost integrated
circuit designed for the controlof switch mode
power supplies.
Duetoits current mode regulation,the TEA2018A
facilitates designof power supplies with following
features:. High stability regulation loop. Automatic input voltage feed-forwardin dis-
continuous mode fly-back. Automatic pulse-by-pulse current limitation
Typical applications: Video Display Units, TV sets,
typewriters, microcomputers andindustrialapplica-
tions
Where synchronizationis required, use the
TEA2019. For more details, see application
note AN406/0591
MONITORING
VCC
FLIP-FLOP
RECOPY
DELAY
500ns1
THERMAL
SHUTDOWN
-1V
VOLTAGE
LIMITATION
OSCILLATOR1
2.4V
COMPARATOR
INTERNAL
BIAS VCC
”Good”
VREF
2.4V2
DEMAGNETIZATION
SENSING
Undervoltage0.1V
OUTPUT
GROUNDISENSE VCC
RCtt
VCC≅50
MAXIMUM
DUTYCYCLE
70%
TEA2018A
2018A-02.EPS
BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
VCC+ Positive Supply Voltage 15 V
VCC- Negative Supply Voltage -5 V
IO(peak) Peak Output Current (duty cycle< 5%) ±1A Input Current (Pin3) ±5mA Junction Temperature +150 oC
Toper Operating Ambient Temperature Range -20, +70 oC
Tstg Storage Temperature Range -40, +150 oC
2018A-01.TBL
THERMAL DATA
Symbol Parameter Value Unit
Rth(j-a) Junction-ambient Thermal Resistance 80 o C/W
2018A-02.TBL
ELECTRICAL OPERATING CHARACTERISTICS
Tamb =25oC, potentials referencedto ground (unless otherwise specified) (see test circuit)
Symbol Parameter Min. Typ. Max. Unit
VCC+ Positive Supply Voltage 6.6 8 15 V
VCC- Negative Supply Voltage -1 -3 -5 V
VCC(start) Minimum Positive Supply Voltage requiredfor starting (VCC+ rising) 6 6.6 V
VCC(stop) Minimum Positive Voltage below wich device stops operating (VCC+ falling) 4.2 4.9 5.6 V
2018A-03.TBL
TEA2018A
ELECTRICAL OPERATING CHARACTERISTICS
Tamb =25oC, potentials referencedto ground (unless otherwise specified) (see test circuit)
Symbol Parameter Min. Typ. Max. Unit
ΔVCC+ Hysteresison VCC+ Threshold 0.7 1.1 1.6 V
ICC(sb) Stand-by Supply Currentbefore starting (VCC+< VCC(start)) 1 1.6 mA
Vth(IC) Current Limitation Threshold Voltage (Pin3) -1100 -1000 -880 mV
R(IC) Collector Current Sensing Input Resistance 1000 Ω
V7(th) Demagnetization Sensing Threshold 75 100 125 mV Demagnetization Sensing Input Current (Pin7= 0V) 1 μA
τmax Maximum Duty Cycle 60 70 % Error Amplifier Gain 50
II+ Error Amplifier Input Current (non-invertinginput) 2 μA
VREF Internal Reference Voltage 2.3 2.4 2.5 V
ΔVREF Reference Voltage Temperature Drift 10-4 V/oC
tOSC Oscillator Free-running Period(R= 59kΩ,C= 1.2nF) 44 48 52 μs
ΔfOSC Oscillator Frequency Drift with Temperature (VCC+= +8V) 0.05 %/oC
ΔfOSC
ΔVCC Oscillator Frequency Drift with VCC+ (+8V< VCC+< +14V) 0.5 %/V
ton(min) Minimum Conducting Time(Ct= 1nF) 2 μs
2018A-04.TBL
RECOMMENDED OPERATING CONDITIONS
Symbol Parameter Min. Typ. Max. Unit
VCC+ Positive Supply Voltage 8 V
VCC- Negative Supply Voltage -3 V Output Current 0.5 A
foper Operating Frequency 30 kHz
2018A-05.TBL
TEA2018A
22nF
1.2nF
4.7nF V7 V6
470nF
22nF
22nF
10Ω470Ω
100Ω
59kΩ
TEST CIRCUIT
TEA2018A
GENERAL DESCRIPTION
(see application note AN-086)
Operating Principles (Figure1) every period, the beginningof the conduction
timeof the transistoris triggeredby the fallof the
oscillator sawtooth which actsas clock signal. The
period Toscis givenby: Tosc≅ 0.66Ct (Rt+ 200)
(Toscin seconds,Ctin Farad,RtinΩ)
The endof the conduction timeis determinedbya
signal issued from comparing the following sig-
nals: the sawtooth waveform representing the
collector currentof the switching transistor,
sampled across the emitter shunt resistor, the outputof the error amplifier.
Base Drive Fast turn-on: On each period,a current pulse
ensures fast transistor switch-on.
This pulse performs also the ton(min) functionat
the beginningof the conduction. Proportionalbase drive:In orderto save power,
the positive base current after the starting pulse
becomesan imageof the collector current.
The ratioICis programmedas follows Figure2):= RB Efficient and fast switch-off: When the positive
base driveis removed, 1ms(typically) will elapse
before the applicationof negative current there-
fore allowinga safe and rapid collector current
fall.
Safety Functions Overload& short-circuit protection: When the
voltage appliedto pin3 exceeds the current
limitation threshold voltage [Vth(Ic)], the output
flip-flopis reset and the transistoris turned off.
The shuntresistorRe mustbe calculatedsoasto
obtain the current limitation thresholdon pin3at
the maximum allowable collector current. Demagnetizationsensing: This functiondisables
any newconductioncycleof thetransistor aslong the coreis not completely demagnetized.
When not used, pin7 mustbe grounded.
-ton(max): Outside the regulation area andin the
absenceof current limitation, the maximum con-
duction timeis setat about70%of the period.
-ton(min):A minimum conducting timeis ensured
during each period (see Figure2) Supply voltage monitoring: The TEA2018A will
stop operatingif VCC+ on pin6 falls below the
threshold level VCC(stop)
OSCILLATOR
SAW-TOOTH
Errorsignal (sample)C
FLIP-FLOP
2018A-05.EPS
TEST CIRCUITI SENSE
OSCILLATOR
ERROR
SIGNAL
ERROR
AMPLIFIER
COMPARATOR
FLIP-FLOP
VREFC
OUTPUT
FILTER LOAD
TEA2018A
TEA2018AC
COLLECTOR
CURRENT
BIAS
CURRENT ReBIC
ton(min)
2018A-06.EPS
Figure2+ VCC+ VoIsCC
1kΩ
50μA
7.5kref
DISCH.
OSC.
GND Ic VCC-
1kΩL= 0.33V CCthH =0.66VCCth
1kΩ
15kCC+ 0.1V
7.5k
15k
2018A-07.EPS
SCHEMATICS OF INPUTS AND OUTPUTS
TEA2018A
Starting Process (Figure3)
Priorto starting,a low currentis drawn from the
high voltage source througha high value resistor.
This current charges the power supply voltage
capacitorof the device. output pulses are available before the voltage pin6 has reached the threshold level [VCC(start),
VCC rising].
During this time the TEA2018A draws only 1mA
(typically). When the voltageon pin6 reaches this
threshold, base drive pulses appear.
The energy drawnby these pulses tendsto dis-
charge the power supply storage capacitor. How-
evera hysteresisof about 1.1V (typically)(Δ VCC) implementedto avoid the device from stopping. (stop)CC (start)CCCC
VCC+
4.9V
2018A-08.EPS
Figure3: Normal Start-up Sequence 3 45 67 8 910 (μs)on (min.) (nF)t
2018A-09.EPS
Figure4: tON (min.) versusCt
47μF
385V
0.1μF
0.1μF x1N4007
RFFilter x12mH
0.5A
220VAC 6 5321
47kΩ
1kΩ
1.2nF 3.9V100Ω
22kΩ 4.7kΩ
10μF150Ω
8.2Ω
4.7μF4.7kΩ
1N414815Ω
1N4148 68Ω
47μF
BUV
46A
2.2kΩ
1nF
1kV
+12V
+5V
4700μF
1000μF
BYW98-50
BYW98-50
220μF
16V
Primary Ground
SecondaryGround
Maximum Power ≅30W
TEA2018A
Operating Frequency≅ 30kHz
2018A-10.EPS
TYPICAL APPLICATION
TEA2018A

Partno	Mfg	Dc	Qty	Available	Descript
TEA2018	ST	N/a	100	avai	CURRENT MODE SWITCHING POWER SUPPLY CONTROL CIRCUIT