1/17
■OVERVOLTAGE PROTECTION FOR 3.3V, 5V
AND 12V WITHOUT EXTERNAL COMPO-
NENTS
■OVERC URRENT PROTECTION FOR 3.3 V,
5V AND 12V WITH INTERNAL THRESHOLD
VOLTAGE
■POWER GOOD CIRCUITRY
■GE N ER AT ES P OWER GOOD SIGN AL
■REMOTE ON/OFF FUNCTION
■PROGRAMMABLE TIMING FOR POWER
GOOD SIGNA L
■14.5V TO 36V SUPPLY VOLTAGE RANGE
■TWO 1.6% VO LTAGE REFERENCES FOR
MAIN AND AUXILIARY CONVERTE R REG-
ULATION LOOPS
DESCRIPTION
The TSM111 integrated circuit incorporates all
sensing circuit to control a triple output power sup-
ply. It includes voltage references , comparators
and m atched resistors bridge for overcurrent and
ove rvol tage detection without the n eed of any ex-
ternal components. Timing generator with external
capacitors, control turn On and Off delays. It pro-
vides an integrat ed and cos t effective sol ution for
simultaneous multiple voltage control.
APPLICATION
This circuit is designed to be used in SMPS for
Desktop PC, to supervise currents and voltages of
all outputs 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 CODE
N = Dual in Line Package (DIP)
D = Small Outline Package (SO) - also available i n Tape & Reel (DT)
PIN CONNECTIONS (top view)
Part Number Temperature Range Package
ND
TSM111C 0, +70°C ••
Example : TSM111CD
N
DIP20
(Plastic Package)
D
SO20
(Plastic Micro packa ge)
1
2
3
4
5
6
7
8
9
10 11
12
13
14
15
16
17
18
19
20
Vs33
Vs5
Vs12
ADJ
Vcc
PWM
REM
Trem
PG
Tpor
Is33
Is5
Is12
Tsur
GND
FbMAIN
VrefMAIN
VrefAUX
FbAUX
UV
TSM111
TRIPLE VOLTAGE AND CURRENT SUPE RVISOR
January 2003
TSM111
2/17
SCHEMATIC DIAGRAM
ABSOLUTE MAXIMUM RATINGS
OPERATING CONDITIONS
Symbol Parameter Value Unit
VCC DC Supply Voltage pin 5 1) 44 V
Iout Output Current Power Good and PWM 30 mA
PdPower Dissipation 1 W
Tstg Storage Temperature Range -55 to +150 °C
ESD Electrostatic Discharge 2 kV
Iin Input Current 50 mA
Vter Minimum voltage on all pins with respect to ground terminal -0.3 V
I1Maximum continuous current in all pins (except pin 5) ±10 mA
I2Max peak current in all pins for latch-up free operation ±200 mA
1. All voltages values, except differential voltage are with respect to network ground terminal.
Symbol Parameter Value Unit
VCC DC Supply Voltage pin 5 1) 15 to 36 V
Toper Operating Free Air Temperature Range 0 to +70 °C
IkOperating Cathode Current, Vrefaux and Vrefmain 30 mA
1. The DC supp l y volt age mu st be hi gher than the maxim um voltage appli ed on the 3.3, 5, 12V in put s (Is3.3, Is 5, Is12) plus 2V .
For exampl e, if 13 .2V is pres ent on the Is1 2 i nput , t he m i ni m um required value on V CC is 15.2V.
TSM111
3/17
ELECTRICAL CHARACTERISTICS
VCC = 16V, Tamb = 0°C to 70°C (typical values given for 25°C)
VOLTAGE REFERENCE, AUXILIARY CONVERTER (Fbaux)
VOLTAGE REFERENCE, MAIN CONVERTER (Fbmain)
Symbol Parameter Test Condition Min. Typ. Max. Unit
ICC Total Supply Current PG low 5 10 mA
Vcs1 Current Sense Threshold Voltage 3.3V 46.5 50 53.5 mV
Vcs2 Current Sense Threshold Voltage 5V 46.5 50 53.5 mV
Vcs3 Current Sense Threshold Voltage 12V 60.5 65 69.5 mV
Viscm Current Sense Input Common Mode
Vo ltage Rang e see note 2 0 VCC -2 V
Vvs1 Overvoltage Sense 3.3V 3.8 4 4.2 V
Vvs2 Overvoltage Sense 5V 5.8 6.1 6.4 V
Vvs3 Overvoltage Sense 12V 13.4 14.2 15 V
VAdj Threshold Voltage, 3.3V OVP
Projection
ADJ Input pin 4 1.22 1.26 1.3 V
Vsur Thereshold Voltage (Tsur input) 2.4 2.5 2.6 V
Tsur Tsur Timing with Determined External
Components 33kΩ to VCC, 4.7µF to
ground 21 ms
Vsurend Tsur Input Clamp Voltage 7 8 V
Vpull Input Pulled Down Voltage for V33, V5
and V12 Isink = 100µA,
REMOTE high 0.4 V
Symbol Parameter Test Condition Min. Typ. Max. Unit
Vrefaux Reference Voltage Ir = 0.5mA, Tamb = 25°C 2.46 2.5 2.54 V
Iaux Current Stability Ir = 0.5mA to 10mA 20 mV
Taux Temperature Stability 17 mV
Regliaux Line Regulation 15 < VCC < 36V 1mV/V
I
outaux Output Sinking Current Capability Vout > 2V 15 25 mA
Symbol Parameter Test Condition Min. Typ. Max. Unit
Vrefmain Reference Voltage Ir = 0.5mA, Tamb = 25°C 2.46 2.5 2.54 V
Imain Current Stability Ir = 0.5mA to 10mA 20 mV
Tmain Temperature Stability 17 mV
Reglimain Line Regulation 15 < VCC < 36V 1mV/V
I
outmain Output Sinking Current Capability Vout > 2V 15 25 mA
Resp Absolute Precision of the Internal Resis-
tor Connected to Vrefmain
(39k, 10k, 5.4k) ±15 %
Resm Matching of the Internal Resistors Con-
nected to Vrefmain
(39k, 10k, 5.4k) ±1 %
TSM111
4/17
POWER GOOD SECTI O N
REMOTE On/Off
Symbol Parameter Test Condition Min. Typ. Max. Unit
Tpor Turn on Delay for Power Good,
Cpor = 2.2µFIc = 20µA typ.,
Vth = 2V typ. 100 300 500 ms
Ic Tpor Delay Charging Current 12 20 28 µA
Vth Tpor Delay Threshold Voltage 1.8 2 2.2 V
Vhdet Under Voltage Comparator Hysteresis 20 40 80 mV
Vhpor Hysteresis on Tpor 200 250 mV
Vdet Vo ltage Detec t Level
UV Input pin 11 1.22 1.26 1.3 V
Rdet Load Resistor on Vdetect
UV Input pin 11 20 kΩ
Vvs4 Undervo ltage Sens e 5V 4.1 4.3 4.5 V
tr PG Output Rise Time CL = 100pF 1µs
tf PG Output Fall Time CL = 100pF 300 ns
Vol2 Power Good Output Saturation Level Ic = 15mA 0.4 V
Ioh2 Power Good Leakage Current Collector Vout = 5V 1µA
Symbol Parameter Test Condition Min. Typ. Max. Unit
Vrem Remote On/Off Input Threshold Level 1 1.8 V
Iil Re mote Input Low Driving Current 1 mA
Vol1 Remote Ouput (PWM) Saturation Level Ic = 0.5mA 1.3 V
Ioh1 Remote Output (PWM) Collector
Leakage Current Vout = 5V 1 µA
Vih1 Remote Input Voltage Level Pin 7 open 4.2 5.25 V
Trem1 Timing On to Off in to On/Off
out, Cext = 100,F 4814ms
Trem2 Timing Off to On in to On/Off
out, Cext = 100nF 16 24 34 ms
TSM111
5/17
PIN DESCRIPTION
Name Pin Type Function
Vcc 5 supply
Positive supply voltage. The DC supply voltage must be higher than the maxi-
mum 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 VCC is 15.2V
Vrefmain 14 analog input Reference comparison input for main converter regulation loop.
2.5V ±1.6%
Fbmain 15 analog output Output for main converter regulation loop (optocoupler)
Vrefaux 13 analog input Reference comparison input for auxiliary converter regulation loop.
2.5V ±1.6%
Fbaux 12 analog output Output for auxiliary converter regulation loop (optocoupler)
IS33 20 analog input 3.3V overcurrent control sense input.
V33 1 analog input 3.3V overvoltage control sense input.
IS5 19 analog input 5V overcurrent control sense input.
V5 2 analog input 5V overvoltage control sense input.
IS12 18 analog input 12V overcurrent control sense input.
V12 3 analog input 12V overvoltage control sense input.
Adj 4 ana input Adjustment pin for 3.3V OVP. This pin is to be used for an OVP other than
3.3V (eg for µC power supply = 2.7V). When not in use, this pin should be
grounded. When in use, VS33 should not be connected.
Tsur 17 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 7 logic input Remote On/Off logic input for µC, turn off PWM after Trem delay.
Rem = 0 means that the main SMPS is operational.
Trem 8 program.
analog input
Connected to external capacitor to determine Trem (remote control delay) tim-
ing. Trem (on to off) is 8ms typ. Trem (off to on) is 24ms typ.
Crem = 0.1µF
PWM 6 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 10 program.
analog input Connected to external capacitor for Power-on-reset timing.
Cpor = 2.2µF
UV 11 analog input Undervoltage detection, control and detect main AC voltage failure.
PG 9 logic input Power Good logic output, 0 or 5V. Power Good high (=1) means that the
power is good for operation.
GND 16 supply Ground or Negative supply voltage.
TSM111
6/17
APPLICATION DIAGRAM
TSM111
7/17
TIMING DIAGRAM : remote control
TSM111
8/17
TIMING DIAGRAM : overvoltage or overcurrent shut-down
TSM111
9/17
AN EXAMPLE OF 90W MICRO ATX POWER
SUPPLY USING L5991A, VIPER20 AND
TSM111
Protection against accidental short circuits and
fault conditions is mandatory in PC power sup-
plies. Th ese prot ecti on circui ts can be re alized by
using m any d iscrete compon ents which o ccupy a
lot of PCB space, design time in fine tuning the cir-
cuit and also add to assemblin g costs.
ST’s single chip TSM111 IC provides complete
protection circuits design easier, with fewer num-
ber 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 protection for 3.3V, 5V and 12V
without external compo nent.
b) Over current protection for 3.3V, 5V and 12V.
c) Gene rates Power Good signal.
d) Programmable timing for Power Good signal.
e) Wide range s upply operating voltage up to 36V
(44V AMR).
f) Stable internal voltage reference.
g) Two 1. 6% voltage reference for M ain and Aux -
iliary regulation.
h) Few external component s.
i) Circuit occupies little space on PCB.
j) Easy implementation of the circuit.
FEATURE DESCRIPTIONS
a) Over voltage protection can be implemented
without any additional components. Overvoltage
sense levels for 3.3V, 5V, 12V are 4V, 6.1V, 14.2V
respectively. With very litt le tolerances, better pro-
tect ion is achieved.
b) Over current protection can be implemented
with very small value sense resistors. As the cur-
rent sense threshold levels are set very low, regu-
lation is not affe cted. The c urrent sense threshold
levels for 3.3V, 5V, 12V are 50mV, 50mV and
65mV res pectively.
c) The power go od signal (pin9) is ass erted to in-
dicate the 5V and 3.3V is above the under voltage
threshold level. PG pin goes high when the above
condition is reached. Pull up resist or 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 ca-
pacitor on pin 10. With 2.2µF/16V capacitor on pin
10, 400ms ec turn on delay is achieved.
e) The power s upply can be operat ed from 14.5V
to 36V. The VCC must always be hi gher than the
supply voltage on the 12V input pin by 2V .i.e. if
14V i s appearing 12V input pin the Vcc must be >
16V.
f) Two internal high precision TL431 shunt regula-
tors are built-in. It provides stable reference volt-
ages with a voltage precision of 1.6%.
TSM111
10/17
SUPERVISORY CIRCUIT OPERATI ON
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 con-
nec ted to remote pin 7.
The IC’s internal logic circuit generates a control
signal on pin 6. In normal operation, when there is
no over vol tage or over current at the t hree inputs,
the voltage on pin 6 follows the Remote pin 7 volt-
age, i.e. if the remo te p in 7 is low the pin 6 i s also
low or vice ve rsa.
W hen fault is det ec ted on the inputs, cont rol pin 6
goes “High”. This control pin 6 output can be used
to turn off the Mains Power Supply during fault
condition. 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 t he pri mary side the
opto transistor collector i s 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-
pens ation pi n is not affec ted and during fa ult con-
dition 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 condition is removed, it is required to reset the
Remote pin to make the system function again.
BILL OF MATERIAL
Th e follow ing are t he bill o f mat e r ial f o r the 90 W S MP S :
No Part Number Qt Manufacturers Remarks / Descriptions
ICs 1 L5991A 1 ST Advanced PWM Controller
2 VIPer20 DIP 1 ST Aux controller PWM+Mos
3 TSM111 1 ST Triple Voltage and Current Supervisor
4 LM7912CV 1 ST -12V Post Regulator
5 TL431 1 ST Programmable Voltage Reference
MOSFETS
6 STP6NB80 1 ST TO220 6A, 800V Mos
7 STP3020L 1 ST TO220 22mohm 33V Mos
Rectifiers
8 BYV10-40 1 ST 1A, 40V or BYV10-60 or BYW100-200
9 BYW100-200 3 ST 1A, 100V or 200V, BYW100-100
10 STPS20L40CT 1 ST 2x10A, 40V or STPS2045CT or
STPS30L40CT
11 STSPS10L40CT 1 ST 2x5A, 40V
12 KAL04 1 - 3Amp 400VAC Bridge Rectifier or higher
13 1N4148 1 -
Transform ers / Inductors
12 HM00-98 150 1 BI Tech. ** Aux Transformer
13 HM00-98151 1 BI Tech. Main Transformer
14 HM00-98 148 1 BI Tech. Coupled inductors
15 HM50-150K 1 BI Tech. 15uH inductors - output filter
16 HM11-51502 1 BI Tech. 2.2uH inductors - output filter
17 HM28-32022 1 BI Tech. Common Mode choke - AC input filter
18 10uH 1 - 10uH inductors - output filter
Connectors
19 AC input conn 1 -
20 20-pin conn:
39-02-2200 1 Molex 20 pin output connector with terminals
Molex 39-00-0038
21 Fann connector 1 -
22 Fuse 3.5A 1 -
23 NTC 1 Siemens 2.2 ohm
24 TLP621 Optocoupler 3 Toshiba 100% transfer ratio
25 AC switch 1 -
26 115V-2 3oV select or 1 -
TSM111
11/17
... continued BILL OF MATERIA L
* * BI T echno l o l es Pte Lt e
Phone No: 65 249-111 5
Fa x No: 6 5 445-1983
Attn: Kelvin Lim, Sales Dept
No Part Number Qt
Capacitors
27 47UF/25V 1
28 3.9NF 1
29 .47UF/16V 1
30 1NF 2
31 100UF/25 1
32 .22UF/250V A.C 2
33 1000UF/10V 2
34 3300UF/10 1
35 470UF/16V 2
36 2.2NF 2
37 2.2UF/16 1
38 470UF/25V 1
39 4.7NF 4
40 47UF/16V 1
41 100UF/25V 3
42 100UF/25V 1
43 47NF 3
44 220UF/200V 2
45 1000UF/25V 1
46 2.2UF 1
47 1.5NF 1
48 10NF 1
49 .1UF 1
50 3.3NF 1
51 56NF 1
No Part Number Qt
Resistors
52 20K 1
53 47K,3W 1
54 100K,1/2W 2
55 5.1K 1
56 3 MOHM 1
57 1OR 2
58 10 MOHM 1
59 4.7K 5
60 68K 1
61 680R 1
62 39K 1
63 3.1K 1
64 470K 1
65 100R 1
66 10K 4
67 3.3K 1
68 5 MOHM 1
69 1K 1
70 330R 1
71 10,1/4W 2
72 470R 1
73 0.68 2
74 6.8K 2
TSM111
12/17
D1
BRIDGE
F1
3.5A
C31
4.7nF
C1
.22uF/250V A.C
C2
.22uF/250V A.CLF01
R4
10
R2
6.8K
R5
10
R6
470
C6
.1uF
C5
1.5nF
C8
56nF
C9
4.7nF
C11
1nF
C7
3.3nF
Q1
STP6NB80 R7A
.22
R13
10K
IC4
TLP621
IC5
TLP621
T1
MAINS TRANS
+
C10
47uF/25V
+
C3
220uF/200V
+
C4
220uF/200V
C13
3.9nF
R15
5.1K
+
47uF/25V
D4
1N4148
T2
AUX TRANS
D7
BYW100-200
+
C35
470uF/16
R16
4.7K
IN
3
GND 2
OUT 1
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
COUPLED INDUCTOR
R17
10
D16
BYW100-200
R18
10
D8
BYW100-200
+
C17
100uF/25
R39
5mohm
R17A
3.5mohm
R19
10mohm
D5
OPT
D6
OPT
C12
4.7nF D2
BYT11-800
R10
47K
C41
2.2uF
C28
2.2uF/16
C51
100nF
R23
680
C
100uF/25V
IC1
IC6
A.C INPUT
100V~ 240V A.C
D13
BYW100-200
D12
BYW100-200
C19
100uF/25V
S2
SW SPST
IC3
1
2
3
4
5
67
8
9
10
11
12
13
14
15
16
17
18
19
20
IS33
UV
ADJ
Tpor
PG
Tsur
REM
FbAUX
Vcc
Trem
VrefAUX
Gnd
VrefMAIN
FbMAIN
PWM
IS12
VS5
IS5
VS12
VS33
SUPERVISOR
S1
SW SPST
1
2
4
3
1
2
3
4
3
41
2
D12
STP1060CT
D3
OPT
DRAIN (out)
3
2
Vcc
1
osc
comp
4
567 8
VIPER20
GND
R11
100K,1/2W
R12
100K,1/2W
C34
100uF/25V
1
2
CN1
CON1
1
2
3
57
6
9
8
L3
10uH
C18
470uF/16V
R8
6.8K
R9
4.7K
VFB
SS
STBY
RCT
VREF
DC-LIM Vcc
OUT
ISEN
SGND
PGND
COMP
DC
DIS Vc
5
7
16
2
3
4
15 14 9
8
10
13
12
11
6
L5991
IC3
L5991A
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
CON3
CN3
R26
39K
C38
47nF
R27
3.1K
C20
470nF
R7A1
6
4
3
5
2
112
11
10
7
8
9
R9
47
C16
1nF
C14
.47uF/16V
R7
1K
D
20V
D5
1N4148
R10
10
Q3
STP3020
D14
OPT
R42
1K R38
3.3K
C23
1000uF/10V
R47
10K
D14
1N4148
C55
10uF/35V
R
20K
IC10
TL431
R44
330
R
X
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
1
2
F
R29
4.7K
R3
100
R28
470K
VAR
R
OPT
R
OPT
R
680,1/2W
12
R
1K
C37
47nF
R
8.2K
5V STDBY
17V
3.3V
5V
12V
-12V
TSM111
PW OK
PS ON/OFF
NTC
2.2ohm
TSM111
13/17
EVALUATION BOARD - T ECHNICA L NOTE
TSM111 is a Housekeeping IC which is best used
in PC Switch Mode Power Sup plies for secondary
3.3V, 5V, and 12V power lines protection.
TS M11 1 integrate s all the necessary fu nctions 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
management. Moreover, TSM111 integrates two
precise shunt voltage references for direct opto-
cou pler drive. TSM111 , integrating th e equivalent
of more than 25 disc rete compo nent s, saves a lot
of de sign t ime and fine tu ning, as wel l as P C B ar-
ea, and increases the reliability of the whole appli-
cation.
How to use the TSM111 Evaluation Board ?
This evaluation board allows to adapt the TSM111
housekeeping chip to an already existing PC Pow-
er Supply by simply choosing proper values for it’s
external components, and making the adequate
connections to the I/O of the evaluation board.
The Electrical Schematic of the TSM111 evalua-
tion board is shown on figure 1. It includes the
TSM111 as well as the minimum component num-
ber required to make the TSM111 fit in a PC
SM PS appl ication.
Components calculations
The overvoltage protection is not to be adjusted.
Internal 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 resist ors R1, R2, R3 (respectively for
each power line 3.3V, 5V, 12V). Internal precise
voltage 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 t ripping currents.
The system will latch (Fault output will be active -
high) if the ov ercurrent lasts m ore than th e autho-
rized surge delay Tsur given by equations 4 & 5 :
Icharge = V cc / 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=33kΩ, C1=4.7µF => Tsur= 21m s
Thanks to the Tsur adjustment, the normal surge
currents which occur during power up (capacitive
oads charging) are blanked fo r a time de pending
on each application.
Vs33 1
Is33 20
Is5 19
Vs5 2
Is12 18
Vs12 3
VrefMain 14
Fbmain 15
VrefAux 13
FbAux 12
PG 9
Tpor 10
Rem 7
TRem
8
Adj
4
Gnd
16
Vcc
5
UV
11
Tsur
17
PWM
6
U1 TSM111
R1
rs3.3V
R2
rs5V
R3
rs12V
D1 UV
R4
Rsur
C1 Csur C2
Crem
R5 R rem
C3
Cpor
R6
1
2
J1
Vdet
1
2
J2
Fault
1
2
J3
Optaux
1
J5
In3.3V
1
J6
1
J7
In3.3V
Vdet
Optaux
Fault
In5V
In12V Out12V
Out5V
Out3.3V
1J8
Out12V
1J9
Out5V
1J10
Out3.3V
PG 1
2J11
PG
12
34
SW1
BP Rem
1
2J12
Rem
From µc
5Vstby
5Vstby
1
2
J13
Vcc
1
2
J14
Gnd
VCC
1
2
J15
VrefMain VrefMain
R7 RoptMain
VrefAux
R8
R9 Roptaux
C4
C5
1
2
J16
VrefAux
R10
1
2J20
D5
D6
I1INV
1
2
J18
OptMain OptMain
Vin
2
GND
1
Vout 3
U2 78L05 5Vstby
+
C7
R11
5Vstby
In5V
IN12V
EVALUATION BOARD - ELECTRICAL SCHEMATIC
C6
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 outp ut :
C2=100nF => Trem 1(ON to OFF )=8m s
C2=100nF => Trem 2(OF F to ON)=24m s
R5 is a pull down resistor on the remote pin of
TSM111. Note that an integrated pull up resistor of
100kΩ is to be taken into acc ount in t he ch oice of
R5, knowing that the threshold voltage of the input
comparat or i s 1.4V . Theref ore, R5 should be low-
er than 38.8kΩ.
R5 = 1kΩ 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 T por delay time al lows t he P G out put (P ower
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 approximat ed equation 6 :
C3 x Vth = Ic x Tpor eq6
where Vth is 2V and Ic is 20µA.
C3=2.2µF => Tpor=300m s
When the 5V power line passes under the 4.3V
undervoltage threshold, the Power Good signal
(P G) falls imm e diately to low le v el.
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 m ain s po wer situation. As an exampl e, 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. T herefore, it is necess ary to
add a zener diode D1.
D1=15V z ener => Vdet =16. 26V
Note that a 20kΩ seria l pull do wn resis tor is int e-
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 p ulled up to the 5V standby
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 capac itor smoothens t he V CC pi n
of TSM 111.
The Adj (Adjust) pin should be connected to
ground. Adjust allows to tune a new overvoltage
pro tection value (ex 2.7V instead of 3.3V).
Example of component lists
Table 1 gives an example of component list
Name Type Value Comment
U1 IC TSM111 DIP20
U2 IC 78L05 TO92
R1 R 1/4W
R 1/2W
R 1W
10mΩ
5mΩ
2.5mΩ
5A
10A
20A
R2 R 1/4W
R 1/2W
R 1W
10mΩ
5mΩ
2.5mΩ
5A
10A
20A
R3 R 1/4W
R 1/2W
R 1W
65mΩ
13mΩ
6.5mΩ
1A
5A
10A
R4 R 1/4W 33KΩ
R5 R 1/4W 1KΩ
R6 R 1/4W 47KΩ
R7 R 1/4W depends on opto used
R8 R 1/4W 10kΩ comp. network to
be fine tuned
R9 R 1/4W depends on opto used
R10 R 1/4W 10kΩ comp. network to
be fine tuned
R11 R 1/4W 47KΩ
D1 Z 1/4W 15V
D5 D 1/4W 1N4148
D6 D 1/4W 1N4148
C1 C Electro 4.7µF
C2 C Plastic 100nF
C3 C Electro 2.2µF
C4 C Plastic 10NF comp. network to
be fine tuned
C5 C Plastic 10NF comp. network to
be fine tuned
C6 C Plastic 100nF
C7 C Electro 10µF
TSM111
15/17
Fi gure 2a Fi gure 2b
TSM111
16/17
PACKAGE MECHANICAL DATA
20 PINS - PLASTIC DIP
Dim. Millimeters Inches
Min. Typ. Max. Min. Typ. Max.
a1 0.254 0.010
B 1.39 1.65 0.055 0.065
b 0.45 0.018
b1 0.25 0.010
D 25.4 1.000
E 8.5 0.335
e 2.54 0.100
e3 22.86 0.900
F 7.1 0.280
I 3.93 0.155
L 3.3 0.130
Z 1.34 0.053
TSM111
17/17
PACKAGE MECHANICAL DATA
20 PINS - PLASTIC MICROPACKAGE (SO)
Dim. Millimeters Inches
Min. Typ. Max. Min. Typ. Max.
A 2.65 0.104
a1 0.1 0.3 0.004 0.012
a2 2.45 0.096
b 0.35 0.49 0.014 0.019
b1 0.23 0.32 0.009 0.013
C 0.5 0.020
c1 45° (typ.)
D 12.6 13.0 0.496 0.512
E 10 10.65 0.394 0.419
e 1.27 0.050
e3 11.43 0.450
F 7.4 7.6 0.291 0.299
L 0.5 1.27 0.020 0.050
M 0.75 0.030
S 8° (max.)
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