TSM111CD datasheet(15/18 Pages) STMICROELECTRONICS

15 / 18 page

loads charging) are blanked for a time dependingon

each application.

When the system has latched (either after overcur-

rent or overvoltage condition), the system needs to

be reset via the Remote input. The C2 capacitor de-

termines two different timings to the Fault output :

C2=100nF => Trem1(ON to OFF)=8ms

C2=100nF => Trem2(OFF to ON)=24ms

R5 is a pull down resistor on the remote pin of

TSM111. Note that an integrated pull up resistor of

100k

Ω is to be taken into account in the choice of

R5, knowing that the threshold voltage of the input

comparator is 1.4V. Therefore, R5 should be lower

than 38.8k

Ω.

R5 = 1k

Ω is a good value.

The evaluation board integrates the possibility to

make theRemote signaleither manual, or electronic

thanks to the ORing diodes D5 and D6 (and the pull

down resistor R5), and the Push Button (SW1).

These diodes can of course be replaced by straps

according to the evaluation requirements (manual

or electronic).

The Tpor delay time allows the PG output (Power

Good) to rise to high level when the 5V power line

internal supervision circuitry has stayed above the

undervoltage 4.3V threshold for more than Tpor

time following the approximated equation 6 :

C3 x Vth = Ic x Tpor

eq6

where Vth is 2V and Ic is 20

µA.

C3=2.2

µF => Tpor=300ms

When the 5V power line passes under the 4.3V un-

dervoltage threshold, the Power Good signal (PG)

falls immediately to low level.

The Power Good output can also be triggered by the

Vdet input of the board. This input should be con-

nected to a power line representative of the AC

mains power situation. As an example, an additional

winding on the auxiliary power supply offer an early

warning of power down from the mains power point

of view. The UV threshold is internally fixed to

Vdet=1.26V. Therefore, it is necessary to add a

zener diode D1.

D1=15Vzener => Vdet=16.26V

Note that a 20k

Ω serial pull down resistor is inte-

grated. Therefore, only a low power zener is

needed.

The Fault output needs a pull up resistor R6.

The Power Good output needs a pull up resistor

R11. Both signals are pulled up to the 5Vstandby

power supply which can be generated from the

evaluation board thanks to a 78L05 5V regulator.

This regulator needs a C6 bypass capacitor. The C7

bypass capacitor smoothens the VCC pin of

TSM111.

The Adj (Adjust) pin shouldbe connectedto ground.

Adjust allows to tune a new overvoltage protection

value (ex 2.7V instead of 3.3V).

Example of component lists

Table 1 gives an example of component list

Name

Type

Value

Comment

TSM111

DIP20

78L05

TO92

R 1/4W

R 1/2W

R1W

10m

Ω

2.5m

Ω

10A

20A

R 1/4W

R 1/2W

R1W

10m

Ω

2.5m

Ω

10A

20A

R 1/4W

R 1/2W

R1W

65m

Ω

13m

Ω

6.5m

Ω

10A

R 1/4W

33k

Ω

R 1/4W

Ω

R 1/4W

47k

Ω

R 1/4W

depends on opto used

R 1/4W

10k

Ω comp. network to

be fine tuned

R 1/4W

depends on opto used

R10

R 1/4W

10k

Ω comp. network to

be fine tuned

R11

R 1/4W

47k

Ω

Z 1/4W

15V

D 1/4W

1N4148

D 1/4W

1N4148

C Electro

4.7

µF

C Plastic

100nF

C Electro

2.2

µF

C Plastic

10NF comp. network to

be fine tuned

C Plastic

10NF comp. network to

be fine tuned

C Plastic

100nF

C Electro

µF

Figures 2a and 2b show the copper and silkscreen

sides of the Evaluation board PCB.

Note that it is not a 1/1 scale.

TSM111

15/18

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