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PDF TEA2019 Data sheet ( Hoja de datos )
| Número de pieza | TEA2019 | |
| Descripción | CURRENT MODE SWITCHING POWER SUPPLY CONTROL CIRCUIT | |
| Fabricantes | ST Microelectronics | |
| Logotipo |  |
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TEA2019
CURRENT MODE SWITCHING
POWER SUPPLY CONTROL CIRCUIT
. DIRECT DRIVE OF THE EXTERNAL
SWITCHING TRANSISTOR
. POSITIVE AND NEGATIVE OUTPUT CUR-
RENTS UP TO 0.5A
. CURRENT LIMITATION
. TRANSFORMER DEMAGNETIZATION AND
POWER TRANSISTOR SATURATION SENS-
ING
. FULL OVERLOAD AND SHORT-CIRCUIT
PROTECTION
. PROPORTIONAL BASE CURRENT DRIVING
. LOW STANDBY CURRENT BEFORE START-
ING (1.6mA)
. SYNCHRONIZATION CAPABILITY WITH IN-
TERNAL PLL
. THERMAL PROTECTION
Due to its current mode regulation, the TEA2019
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, micro-computers and industrial appli-
cations. For more details, see application
note AN406/0591.
DESCRIPTION
The TEA2019 is an 14-pin DIP low cost integrated
circuit designed for the control of switch mode
power supplies. It has the same basic functions as
the TEA2018Abut with synchronization capability
by internal PLL. It is particularly suitable for appli-
cations where oscillator synchronization is re-
quired.
PIN CONNECTIONS
OUTPUT
AUXILIARY OUTPUT SUPPLY
POSITIVE SUPPLY VOLTAGE
SATURATION SENSING
DEMAGNETIZATION SENSING
ERROR AMPLIFIER NON-INVERTING INPUT
SYNCHRONIZATION INPUT
1
2
3
4
5
6
7
August 1992
DIP 14
(Plastic package)
ORDER CODE : TEA2019
14 NEGATIVE SUPPLY (OUTPUT STAGE)
13 SUBSTRATE
12 I C SAMPLE (NEGATIVE)
11 GROUND
10 OSCILLATOR CAPACITOR
9 OSCILLATOR REFERENCE CURRENT
8 PLL OUTPUT
1/7
1 page  
TEA2019
• Efficient and fast switch-off
When the positive base drive is removed, 1s
(typically) will elapse before the application of
negative current therefore allowing a safe and
rapid collector current fall.
Safety Functions
• Overload & short-circuit protection
When the voltage applied to pin 12 exceeds the
current limitation thershold voltage [Vth(Ic)], the
output flip-flop is reset and the transistor is turned
off.
The shunt resistor Re must be calculated so as
to obtain the current limitation threshold on pin
12 at the maximum allowable collector current.
Figure 2
• Demagnetization sensing
This function disables any new conduction cycle
of the transistor as long as the core is not com-
pletely demagnetized.
When not used, pin 5 must be grounded.
• ton(max)
Outside the regulation area and in the absence
of current limitation, the maximum conduction
time is set at about 70% of the period.
• ton(min)
A minimum conducting time is ensured during
each period (see Figure 2).
• Supply voltage monitoring
The TEA2019 will stop operatingif VCC+ on Pin 3
falls below the threshold level VCC(stop).
IC
TEA2019
12
RB
1
IB
IC
Re
0
IB t on(min)
0
COLLECTOR
CURRENT IC
t
BIAS
CURRENT
IB
RB
Re
IC
t
Starting Process (Figure 3)
Prior to starting, a low current is drawn from the
high voltage source through a high value resistor.
This current charges the power supply storage
capacitor of the device.
No output pulses are available before the voltage
on pin 3 has reached the threshold level [VCC(start),
V+CC rising].
During this time the TEA2019 draws only 1mA
(typically). When the voltage on pin 3 reaches this
threshold base drive pulses appear.
The energy drawn by these pulses tends to dis-
charge the power supply storage capacitor. How-
ever a hysteresis of about 1.1V (typically) (∆ VCC)
is implemented to avoid the device from stopping.
Figure 3 : Normal TEA2019 Start up Sequence
V CC
6V
4.9V
V CC
VCC (start)
VCC (stop)
t
5/7
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet TEA2019.PDF ] | |
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