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VOLTAGE SUPPLY OPERATING AREA

Figure 2 shows the Voltage Supply Operating area

during the switch ON-OFF and OFF-ON sequence.

- Switch ON-OFF sequence:

For an Input Voltage Vi > 25V, the circuit operates

correctly, because it lies in the Voltage Supply

Operating Area.

The converter goes in High Input Impedance mode

remains between 0 -10V range for almost for almost

100 ms, the converter is in OFF condition.

- Switch OFF-ON sequence:

The quiescent current Iq remains below 10

µAif Vi

is lower than 18V.

The start-up voltage is between 34 to 44V. After 1

ms in this condition, the converter is in Voltage

115V

25V

0V

10V

44V

t>1mS

t>100mS

18V

Voltage Supply

Operating Area

Voltage

Supply

Operating

Area

Iq < 10

µA Area

Iq < 10

µA Area

Vi

t

34V

Figure 2.

Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for the

consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No

license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specification mentioned

in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied.

SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without express

written approval of SGS-THOMSON Microelectronics.

© 1994 SGS-THOMSON Microelectronics – All Rights Reserved

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