TRIPLE VOLTAGE AND CURRENT SUPERVISOR

OVERVOLTAGE PROTECTION FOR 3.3V, 5V

AND

12V

WITHOUT

EXTERNAL

COMPONENTS

OVERCURRENT PROTECTION FOR 3.3V, 5V

AND 12V WITH INTERNAL THRESHOLD
VOLTAGE

POWER GOOD CIRCUITRY

GENERATES POWER GOOD SIGNAL

REMOTE ON/OFF FUNCTION

PROGRAMMABLE

TIMING

FOR

POWER

GOOD SIGNAL

14.5V TO 36V SUPPLY VOLTAGE RANGE

TWO 1.6% VOLTAGE REFERENCES FOR

MAIN

AND

AUXILIARY

CONVERTER

REGULATION LOOPS

DESCRIPTION

The TSM111 integrated circuit incorporates all
sensing circuit to control a triple output power sup-
ply. It includes voltage references , comparatorsand
matched resistors bridge for overcurrent and over-
voltage detection without the need of any external
components.Timing generatorwith external capaci-
tors, control turn On and Off delays. It provides an
integrated and cost effective solution for simultane-
ous multiple voltage control.

APPLICATIONS

This circuit is designedto be used in SMPS forDesk-
top PC, to supervise currents and voltages of all out-
puts and generate power good information to the
system while managing all timing during transitory
operation.
The IC also manages the standby mode of SMPS
while the PC is in sleep mode.

ORDER CODES

Part

Number

Temperature

Range

Package

TSM111C

0, +70

Example : TSM111CD

Vs33

Vs5

Vs12

ADJ

Vcc

P WM

REM

Tre m

P G

Tpor

Is33

Is5

Is12

Ts ur

GND

FbMAIN

VrefMAIN

VrefAUX

FbAUX

PIN CONNECTIONS (top view)

TSM111

May 1999

DIP20

(Plastic Package)

SO20

(Plastic Micropackage)

1/18

ABSOLUTE MAXIMUM RATINGS

Symbol

Parameter

Value

Unit

DC Supply Voltage pin 5 - note 1

out

Output Current Power Good and PWM

Power Dissipation

stg

Storage Temperature Range

-55 to +150

ESD

Electrostatic Discharge

Input Current

Note : 1.

Al l vol tages val ues, except dif ferenti al voltage, are w ith respect to netw ork ground terminal.

SCHEMATIC DIAGRAM

OPERATING CONDITIONS

Symbol

Parameter

Value

Unit

DC Supply Voltage pin 5 - note 2

15 to 36

oper

Operating Free Air Temperature Range

0 to +70

Operating Cathode Current, Vrefaux and Vrefmain

Note :

2. The D C supply voltage must be higher than t he maxi mum vol tage applied on the 3.3, 5, 12V inputs

(I s3.3, Is5, Is12) plus 2V.
For example, if 13.2V is present on the I s12 input, the mi nimum required value on V

is 15.2V .

TSM111

2/18

ELECTRICAL CHARACTERISTICS

= 16V, T

amb

= 0

C to 70

C (typical values given for 25

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

Total Suppy Current

PG Low

cs1

Current Sense Threshold Voltage 3.3V

46.5

53.5

cs2

Current Sense Threshold Voltage 5V

46.5

53.5

cs3

Current Sense Threshold Voltage 12V

60.5

69.5

iscm

Current Sense Input Common Mode
Voltage Range

see note 2

-2

vs1

Overvoltage Sense 3.3V

3.8

4.2

vs2

Overvoltage Sense 5v

5.8

6.1

6.4

vs3

Overvoltage Sense 12V

13.4

14.2

Adj

Threshold Voltage, 3.3V OVP
Protection.
ADJ input pin4

1.22

1.26

1.3

sur

Threshold voltage (Tsur input)

2.4

2.5

2.6

sur

Tsur Timing with Determined External
Components

33k

to V

, 4.7

F to

ground

surend

Tsur Input Clamp Voltage

pull

Input Pulled Down Voltage for V33, V5
and V12

Isink = 100

REMOTE high

0.4

VOLTAGE REFERENCE, AUXILIARY CONVERTER (Fbaux)

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

Vrefaux

Reference Voltage

= 0.5mA, T

amb

= 25

2.46

2.5

2.54

Iaux

Current Stability

= 0.5mA to 10mA

Taux

Temperature Stability

Regliaux

Line Regulation

15 < V

< 36V

mV/V

Ioutaux

Output Sinking Current Capability

out

> 2V

VOLTAGE REFERENCE, MAIN CONVERTER (Fbmain)

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

Vrefmain

Reference Voltage

= 0.5mA, T

amb

= 25

2.46

2.5

2.54

Imain

Current Stability

= 0.5mA to 10mA

Tmain

Temperature Stability

Reglimain

Line Regulation

15 < V

< 36V

mV/V

Ioutmain

Output Sinking Current Capability

out

> 2V

Resp

Absolute Precision of the Internal
Resistor Connected to Vrefmain
(39k, 10k, 5.4k)

+-15

Resm

Matching of the Internal Resistors
Connected to Vrefmain
(39k, 10k, 5.4k)

+-1

TSM111

3/18

POWER GOOD SECTION

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

Tpor

Turn on Delay for Power Good,
Cpor = 2.2

Ic = 20

A typ.,

Vth = 2V typ.

100

300

500

Tpor Delay Charging Current

Vth

Tpor Delay Threshold Voltage

1.8

2.2

Vhdet

Under Voltage Comparator Hysteresis

Vhpor

Hysteresis on Tpor

200

250

Vdet

Voltage Detect Level
UV Input pin 11

1.22

1.26

1.3

Rdet

Load Resistor on Vdetect
UV Input pin 11

Vvs4

Undervoltage Sense 5V

4.1

4.3

4.5

PG Output Rise Time

= 100pF

PG Output Fall Time

= 100pF

300

Vol2

Power Good Output Saturation Level

Ic = 15mA

0.4

Ioh2

Power Good Leakage Current Collector

out

= 5V

REMOTE On/Off

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

Vrem

Remote On/Off Input Threshold Level

1.8

Iil

Remote Input Low Driving Current

Vol1

Remote Output (PWM) Saturation Level

Ic = 0.5mA

1.3

Ioh1

Remote Output (PWM) Collector
Leakage Current

Vout = 5V

Vih1

Remote Input Voltage Level

Pin 7 open

4.2

5.25

Trem1

Timing On to Off in to On/Off
out, Cext = 100nF

Trem2

Timing Off to On in to On/Off
out, Cext = 100nF

TSM111

4/18

PIN DESCRIPTION

Name

Pin

Type

Function

supply

Positive supply voltage. The DC supply voltage must be higher than
the maximum voltage applied on the 3.3, 5, 12V inputs (Is3.3, Is5,
Is12) plus 2V.
For example, if 13.2V is present on the Is12 input, the minimum
required value on V

is 15.2V

Vrefmain

analog input

Reference comparison input for main converter regulation loop.
2.5V +-1.6%

Fbmain

analog output

Output for main converter regulation loop (optocoupler)

Vrefaux

analog input

Reference comparison input for auxiliary converter regulation loop.
2.5V +-1.6%

Fbaux

analog output

Output for auxiliary converter regulation loop (optocoupler)

IS33

analog input

3.3V overcurrent control sense input.

V33

analog input

3.3V overvoltage control sense input.

IS5

analog input

5V overcurrent control sense input.

analog input

5V overvoltage control sense input.

IS12

analog input

12V overcurrent control sense input.

V12

analog input

12V overvoltage control sense input.

Adj

ana input

Adjustment pin for 3.3V OVP. This pin is to be used for an OVP other
than 3.3V (eg for

C power supply = 2.7V). When not in use, this pin

should be grounded. When in use, V

S33

should not be connected.

Tsur

program.

analog input

Overcurrent blank-out time 20 to 30ms settable through external RC.
The voltage at this pin is clamped at typically 5V. Trip voltage = 1.25V.

Rem

logic input

Remote On/Off logic input for

C, turn off PWM after Trem delay.

Rem = 0 means that the main SMPS is operational.

Trem

program.

analog input

Connected to external capacitor to determine Trem (remote control
delay) timing. Trem (on to off) is 8ms typ. Trem (off to on) is 24ms typ.
Crem = 0.1

PWM

logic output

Output signal to control the primary side of the main SMPS through
an opto-coupler. When PWM is low, the main SMPS is operational.

Tpor

program.

analog input

Connected to external capacitor for Power-on-reset timing.
Cpor = 2.2

analog input

Undervoltage detection, control and detect main AC voltage failure.

logic input

Power Good logic output, 0 or 5V. Power Good high (=1) means that
the power is good for operation.

GND

supply

Ground or Negative supply voltage.

TSM111

5/18

AN EXAMPLE OF 90W MICRO ATX
POWER SUPPLY USING L5991A, VI-
PER20 AND TSM111

Protection against accidental short circuits and fault
conditions is mandatory in PC power supplies.
These protection circuits can be realized by using
many discrete components which occupy a lot of
PCB space, design time in fine tuning the circuit and
also add to assembling costs.
ST's single chip TSM111 IC provides complete pro-
tection circuits design easier, with fewer number of
components. TSM111 is an ideal supervisor IC for
PC power supplies.
The salient features and benefits of this device are
listed below :
a) Over voltage protectionfor 3.3V,5V and12V with-
out external component.
b) Over current protection for 3.3V, 5V and 12V.
c) Generates Power Good signal.
d) Programmable timing for Power Good signal.
e) Wide range supply operating voltage up to 36V
(44V AMR).
f) Stable internal voltage reference.
g) Two 1.6% voltage reference for Main and Auxil-
iary regulation.
h) Few external components.
i) Circuit occupies little space on PCB.

j) Easy implementation of the circuit.

FEATURE DESCRIPTIONS

a) Over voltage protectioncan be implemented with-
out any additional components. Overvoltage sense
levels for 3.3V, 5V, 12V are 4V, 6.1V, 14.2V respec-
tively. With very little tolerances, better protection is
achieved.
b) Over current protection can be implemented with
very small value sense resistors. As the current
sense threshold levels are set very low, regulation
is not affected. The current sense threshold levels
for 3.3V, 5V, 12V are 50mV, 50mV and 65mV re-
spectively.
c) The power good signal (pin9) is asserted to indi-
cate the 5V and 3.3V is above the under voltage
threshold level. PG pin goes high when the above
condition is reached. Pull up resistor R27 (3.1K) is
connected to 5V STDBY supply from this pin.
d) The timing of the power good signal can be con-
trolled by adjusting the value of the charging capaci-
tor on pin 10. With 2.2

F/16V capacitor on pin 10,

400msec turn on delay is achieved.
e) The power supply can be operated from 14.5V to
36V. The V

must always be higher than the supply

voltage on the 12V input pin by 2V .i.e. if 14V is ap-
pearing 12V input pin the Vcc must be > 16V.

A COMPLETE PC SMPS SECONDARY SUPERVISOR

TSM111

9/18

f) Two internal high precision TL431 shunt regula-
tors are built-in. It provides stable referencevoltages
with a voltage precision of 1.6%.

SUPERVISORY CIRCUIT OPERATION

The system power ON/OFF logic is generated by
the PC, which is "Low" in system "On" condition and
"High" when the system is "Off". This is connected
to remote pin 7.
The IC's internal logic circuit generatesa control sig-
nal on pin 6. In normal operation, when there is no
over voltage or over current at the three inputs, the
voltage on pin 6 follows the Remote pin 7 voltage,
i.e. if the remote pin 7 is low the pin 6 is also low or
vice versa.
When fault is detected on the inputs, control pin 6
goes "High". This control pin 6 output can be used
to turn off the Mains Power Supply during fault con-

dition. An optocoupler is connected directly, with
cathode connected to the IC pin 6 and anode to
5V (from STDBY supply).
In normal operation the voltage on pin 6 is (opto
cathode) is around 3.7 V. On the primary side the
opto transistor collector is pulled through a resistor
to Vref.
It is required to invert the signal before connecting
to the feedback compensation pin 6 of L5991A for
reverse logic. i.e during normal operation the com-
pensation pin is not affected and during fault condi-
tion the pin is pulled Low. Slight delay (R34,C32) is
introduced on the primary side to avoid fault turn on
condition.

Note : Once the fault conditi on is removed, it is required to
reset the Remote pin to make the system functi on again.

TSM111

10/18

Part Number

Manufacturers

Remarks/Descirptions

ICs

L5991A

Advanced PWM Controller

VIPer20DIP

Aux controller PWM+Mos

TSM111

Triple Voltage and Current Supervisor

LM7912CV

-12V Post Regulator

TL431

Programmable Voltage Reference

MOSFETs

STP6NB80

TO220 6A, 800V Mos

STP3020L

TO220 22mohm 30V Mos

Rectifiers

BYV10-40

1A, 40V or BYV10-60 or BYW100-200

BYW100-200

1A, 100V or 200V, BYW100-100

STPS20L40CT

2x10A, 40V or STPS2045CT or
STPS30L40CT

STSPS10L40CT

2x5A, 40V

KAL04

3Amp 400VAC Bridge Rectifier or higher

1N4148

Transformers / Inductors

HM00-98150

BI Tech.**

Aux Transformer

HM00-98151

BI Tech.

Main Transformer

HM00-98148

BI Tech.

Coupled inductors

HM50-150K

BI Tech.

15uH inductors - output filter

HM11-51502

BI Tech.

2.2uH Inductors - output filter

HM28-32022

BI Tech.

Common Mode choke - AC input filter

10uH

10uH inductors - output filter

Connectors

AC input conn

20-pin conn:
39-01-2200

Molex

20pin output connector with terminals
Molex 39-00-0038

Fann connector

Fuse 3.5A

NTC

Siemens

2.2 ohm

TLP621 Optocoupler

Toshiba

100% transfer ratio

AC switch

115V-230V selector

BILL OF MATERIAL

The following are the bill of material for the 90W SMPS :

TSM111

11/18

Part Number

Capacitors

Resistors

47UF/25V

20K

3.9NF

47K,3W

.47UF/16V

100K,1/2W

1NF

5.1K

100UF/25

3 MOHM

.22UF/250V A.C

1OR

1000UF/10V

10 MOHM

3300UF/10

4.7K

470UF/16V

68K

2.2NF

680R

2.2UF/16

39K

470UF/25V

3.1K

4.7NF

470K

47UF/16V

100R

100UF/25V

10K

100UF/25V

3.3K

47NF

5 MOHM

220UF/200V

1000UF/25V

330R

2.2UF

10,1/4W

1.5NF

470R

10NF

0.68

.1UF

6.8K

3.3NF

56NF

** BI Technolo ies Pte Lte

Phone No: 65 249-1115
F ax No: 65 445-1983
Attn: Kelvi n Lim, Sales Dept

.... continued BILL OF MATERIAL

TSM111

12/18

BRIDGE

F1
3.5A

C31

4.7nF

.22uF/250V A.C

LF01

R4
10

6.8K

R5
10

R6
470

.1uF

1.5nF

56nF

4.7nF

C11

1nF

3.3nF

Q1
STP6NB80

R7A

.22

R13

10K

IC4

TLP621

IC5

TLP621

MAINS TRANS

C10

47uF/25V

220uF/200V

C13

3.9nF

R15
5.1K

47uF/25V

1N4148

AUX TRANS

D7
BYW100-200

C35

470uF/16

R16

4.7K

I N

GND

O U T

IC7

L7912

IC2

TLP621

D15

BYW100-200

D11
STPS2045CT

C21
2.2nF

C26
2.2nF

C40

1000uF/25V

C24

3300uF/10

C22

1000uF/10V

L2
COUPLEDINDUCTOR

R17

D16
BYW100-200

R18

D8
BYW100-200

C17

100uF/25

R39
5mohm

R17A
3.5mohm

R19
10mohm

OP T

OPT

C12

4.7nF

BYT11-800

R10

47K

C41

2.2uF

C28

2.2uF/16

C51

100nF

R23
680

100uF/25V

I C 1

I C 6

A . C

I N P U T

1 0 0 V ~

2 4 0 V

A . C

D13
BYW100-200

D12

BYW100-200

C19

100uF/25V

S2
SW SPST

I C 3

1 0

1 1

1 7

IS33

U V

A D J

T p o r

P G

T s

u r

R E M

FbAUX

V c c

T r e m

VrefAUX

G n d

VrefMAIN

FbMAIN

P W M

IS12

VS5

IS5

VS12

VS33

S U P E R V I S O R

S1
SWSPST

D12
STP1060CT

OP T

D R A I N

( o u t )

V c c

o s c

c o m p

V I P E R 2 0

G N D

R11

100K,1/2W

R12

100K,1/2W

C34

100uF/25V

1 2

CN1
CON1

L3
10uH

C18

470uF/16V

R8
6.8K

4.7K

V F B

S T B Y

R C T

V R E F

D C - L I M

V c c

O U T I S E N

S G N D

P G N D

C O M P

D C

D I S

V c

1 6

1 5

1 4

1 0

1 3

1 2 1 1 6

L 5 9 9 1

IC3
L5991A

2 3 4 5 6 7 8 9 1 0

1 11 2

1 3

1 41 5

1 6

1 7

1 8

1 92 0

CON3
CN3

R26

39K

C38

47nF

R27

3.1K

C20

470nF

R7A1

1 2

1 1

1 0

R9
47

C16

1nF

C14

.47uF/16V

20V

D5
1N4148

R10

STP3020

D14
OP T

R42

R38

3.3K

C23

1000uF/10V

R47

10K

D14

1N4148

C55

10uF/35V

20K

IC10

TL431

R44

330

R43

4.7K

R45

4.7K

GND ANALOG

R24

10K

Q2
NPN1

R34

10K

L4
2.2uH

C25

470uF/16V

R20
4.7K

C32

220uF/16V

C30
4.7nF

L6
INDUCTOR

C29

470uF/25V

R22

33K

R29

4.7K

R3
100

R28

470K

VAR

OPT

680,1/2W

1 2

C37
47nF

8.2K

V S T D

B Y

1 2

T S M 1 1 1

W O

S O

/ O

NTC
2.2ohm

TSM111

13/18

TSM111 is a Housekeeping IC which is best used
in PC Switch Mode Power Supplies for secondary
3.3V, 5V, and 12V power lines protection.
TSM111 integrates all the necessary functions for a
secure and reliable overcurrent and overvoltage
protection, as well as a logic interface for proper
communication with the motherboard and adjust-
able timing circuitry for optimized sequencing man-
agement. Moreover, TSM111 integrates two pre-
cise shunt voltage references for direct optocoupler
drive. TSM111, integrating the equivalent of more
than 25 discrete components, saves a lot of design
time and fine tuning, as well as PCB area, and in-
creases the reliability of the whole application.

How to use the TSM111 Evaluation Board ?
This evaluation board allows to adapt the TSM111
housekeepingchip to an already existing PC Power
Supply by simply choosing proper values for it's ex-
ternal components, and making the adequate con-
nections to the I/O of the evaluation board.

The Electrical Schematic of the TSM111 evaluation
board is shown on figure 1. It includes the TSM111
as well as the minimum component number re-
quired to make the TSM111 fit in a PC SMPS appli-
cation.

Components calculations
The overvoltage protection is not to be adjusted. In-
ternal voltage thresholds are given by Vvs1, Vvs2,
Vvs3 for respective protection of the 3.3V, 5V, 12V
power lines.
The overcurrent protection is given by the choice of
the Sense resistors R1, R2, R3 (respectively for
eachpower line 3.3V, 5V, 12V). Internalprecise volt-
age thresholds define the tripping voltage drops for
each line following equations 1, 2 & 3 :
Vcs1 = R1 x I33

eq1

Vcs2 = R2 x I5

eq2

Vcs3 = R3 x I12

eq3

where I33, I5, and I12 are the tripping currents.
The system will latch (Fault output will be active -
high) if the overcurrent lasts more than the author-
ized surge delay Tsur given by equations 4 & 5 :
Icharge = Vcc / R4

eq4

Tsur = (C1 x Vsur) / Icharge

eq5

Note that eq4 is an approximation of a capacitive
charge where Vcc (16V min) is large versus the
threshold voltage Vsur (2.5V).
R4=33k

, C1=4.7

F => Tsur=21ms

Thanks to the Tsur adjustment, the normal surge
currents which occur during power up (capacitive

EVALUATION BOARD - TECHNICAL NOTICE

V s 3 3

I s 3 3

2 0

I s 5

1 9

V s 5

I s 1 2

1 8

V s 1 2

V r e f M a i n

1 4

F b m a i n

1 5

V r e f A u x

1 3

F b A u x

1 2

Tpor

Rem

T R e m

A d j

G n d

1 6

V c c

Tsur

PWM

TSM111

rs3.3V

rs5V

rs12V

Rsur

Csur

C2
Crem

R5 R rem

Cpor

1
2

Vdet

1
2

Fault

1
2

Optaux

In3.3V

Vdet

Optaux

Fault

In5V

In12V

Out12V

Out5V

Out3.3V

J8
Out12V

J9
Out5V

J10
Out3.3V

1
2

J11
PG

SW1

BP Rem

1
2

J12
Rem

Fro m c

5Vstby

1
2

J13
Vcc

1
2

J14
Gnd

VCC

1
2

J15

VrefMain

RoptMain

VrefAux

Roptaux

1
2

J16

VrefAux

R10

1
2

J20

1INV

1
2

J18

OptMain

Vin

G N D

Vout

U2 78L05

5Vstby

R11

5Vstby

In5V

IN12V

EVALUATION BOARD - ELECTRICAL SCHEMATIC

TSM111

14/18

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

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

R5 = 1k

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

C3=2.2

F => 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

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 V

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
R 1W

10m

2.5m

5A
10A
20A

R 1/4W
R 1/2W
R 1W

10m

2.5m

5A
10A
20A

R 1/4W
R 1/2W
R 1W

65m

13m

6.5m

1A
5A
10A

R 1/4W

33k

R 1/4W

47k

R 1/4W

depends on opto used

R 1/4W

10k

comp. network to

be fine tuned

R 1/4W

depends on opto used

R10

R 1/4W

10k

comp. network to

be fine tuned

R11

R 1/4W

47k

Z 1/4W

15V

D 1/4W

1N4148

D 1/4W

1N4148

C Electro

4.7

C Plastic

100nF

C Electro

2.2

C Plastic

10NF comp. network to
be fine tuned

C Plastic

10NF comp. network to
be fine tuned

C Plastic

100nF

C Electro

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

PACKAGE MECHANICAL DATA
20 PINS -PLASTIC MICROPACKAGE (SO)

Dimensions

Millimeters

Inches

Min.

Typ.

Max.

Min.

Typ.

Max.

2.65

0.104

0.1

0.3

0.004

0.012

2.45

0.096

0.35

0.49

0.014

0.019

0.23

0.32

0.009

0.013

0.5

0.020

(typ.)

12.6

13.0

0.496

0.512

10.65

0.394

0.419

1.27

0.050

11.43

0.450

7.4

7.6

0.291

0.299

0.5

1.27

0.020

0.050

0.75

0.030

(Max.)

Information furnished is believed to be accurate and reliable. However, STMicroelectronics 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 STMicroelectronics.
Specifications mentioned in this publication are subject to change without noti ce. This publication supersedes and replaces all
information previously supplied. STMicroelectronics products are not author ized for use as critical components in life support
devices or systems without express written approval of STMicroelectronics.

The ST log o is a trademark of STMicroelectronics

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TSM111

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