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TEA2019 Datasheet(PDF) 6 Page - STMicroelectronics

Part No. TEA2019
Description  CURRENT MODE SWITCHING POWER SUPPLY CONTROL CIRCUIT
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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TEA2019 Datasheet(HTML) 6 Page - STMicroelectronics

   
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The TEA2019 has some additional capabilities
compared to the TEA2018A :
• The oscillator charge current its supplied through
an internal current generator,programmed exter-
nally - instead of using an external charging
resistor. The sawtooth so obtained is linear.
• The oscillator can be synchronized through an
internal PLL circuit. This feature provides syn-
chronization between the external sync pulse
and the end of the switching transistor current.
The sync pulse can be for example the fly-back
pulse of a TV horizontal sweep circuit. As indi-
cated in the application diagram, this pulse is
applied first to a R.C. network to obtain a low
voltage sawtooth and then to pin 7 of the circuit.
The PLL output (pin 8) supplies a correction
current to pin 9 through an external resistor, so
as to maintain the oscillator at the correct fre-
quency (refer to application note 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
voltage in order to reduce the I.C. power dissipa-
tion.
For low power applications, the circuit can be
normally supplied by connecting pins 2 and 3
together.
• In order to protect the substrate (pin 13) from the
parasitic voltage peaks produced by negative
output current peaks at pin 14, the substrate
(pin 13) is internally separated from the negative
supply (pin 14). They must be externally con-
nected together.
• The switching transistor saturation voltage can
be monitored at pin 4. To achieve this, a high
voltage diode must be connected between the
collector of the switching transistor and pin 4.
Also a resistor must be connected from pin 4 to
V
+
CC (see application diagram). This arrange-
ment is useful when the chosen value of base
current is very low and as a consequence the
saturationvoltage will be high. In this event, when
VCE(sat) increases above 2.5V, the base current
is interrupted before the normal end of the period.
Remark : the TEA2019 can also operate without
this protection.
47
µF
385V
0.1
µF
0.1
µF
4 x 1N4007
RF Filter
2 x 12mH
0.5A
1N4148
Primary Ground
Secondary Ground
TEA2019
Mains
Input
7
8
65
910
4
11
3
12
21
13
14
1.5nF
22nF
3.3nF
56k
56k
3.9k
82k
10k
10k
1.8k
47nF
33nF
C2
10
µF
18
10
10k
470
µF
1N4148
3.9
120k
1W
3.3
BUV
46A
BYT
11-100
BYT11-100
0.47
4.7
10
µF
BYT11-800
BYT11-800
100
µF
160V
470
µF
40V
120V
0.4A
24V
0.5A
1k
3W
680
3W
2.2nF
100
3 x 1N4001
n3
n0
n2
n1
Sync.
Pulse
TYPICAL APPLICATION
.
PMAX = 60W
.
Free-running Frequency : 15kHz
.
155VRMS
≤ VAC ≤ 250VRMS
.
Outputs:
120V
± 3%, 0.4A
24V
±3%, 0.5A
.
VCE Monitoring
TEA2019
6/7


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