TD230D datasheet(11/15 Pages) STMICROELECTRONICS

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Figure 9B : Silkscreen

Figure 9C : Schematic

Figure 9A : PCB (not to scale)

eventual control block, or, if it should not be used,

tied to the GND pin.

4. Th e SHUTDOWN pin i s an open dr ain

CMOS/TTL compatible output which should be tied

to the TTL compatible input of an eventual control

block.

The absolute maximum rating of this output is 7V.

In the case of a visual alarm, a LED is likely to be

tied to the positive power supply which can be

destructive for the Shutdown output if the power

supply is over 7V. An easy way to eliminate this is

to add a 6V zener diode between the Shutdown

output and the Ground as shown on figure 10.

5. The time constant of the protection mode (given

by the charge of CTRIP1/2 capacitors) must be

greater than the time constant of the restart at-

tempts (given by the charge of the CSS 1/2 soft start

capacitors). This condition can be described as

follows :

• VSP1/2 xCTRIP1/2 /IP/N2 >VTH1/2 x

(CSS1/2+CISS1/2)/ IP/N1

TD230

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TD230D Datasheet(PDF) 11 Page - STMicroelectronics