TSM111CD datasheet(14/17 Pages) STMICROELECTRONICS

14 / 17 page

TSM111

14/17

When the system has latched (either after over-

current or overvoltage condition), the system

needs to be reset via the Remote input. The C2

capacitor determines 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 low-

er than 38.8k

Ω.

R5 = 1k

Ω is a good value.

The evaluation board integrates the possibility to

make the Remote signal either manual, or elec-

tronic 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 require-

ments (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

undervoltage 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

connected to a power line representative of the

AC mains power situation. As an example, an ad-

ditional 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 need-

ed.

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 should be connected to

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

R 1W

10m

Ω

2.5m

Ω

10A

20A

R 1/4W

R 1/2W

R 1W

10m

Ω

2.5m

Ω

10A

20A

R 1/4W

R 1/2W

R 1W

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

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