TEA2019 datasheet(5/7 Pages) STMICROELECTRONICS

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• 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.

• 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).

R

B

R e

IB

I

C

t

I

C

I

B

0

COLLECTOR

CURRENT

BIAS

CURRENT

I

C

I

B

R e

R

B

I

C

t

on(min)

1

12

TEA2019

Figure 2

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.

V

CC (start)

CC (stop)

V

CC

V

CC

6V

4.9V

t

Figure 3 : Normal TEA2019 Start up Sequence

TEA2019

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