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TSM1121IDSTN/a17115avai3.3V 5V 12V HOUSEKEEPING IC
TSM1121INSTN/a5160avai3.3V 5V 12V HOUSEKEEPING IC


TSM1121ID ,3.3V 5V 12V HOUSEKEEPING ICELECTRICAL CHARACTERISTICS Tamb = 25°C and Vcc = 17V (unless otherwise specified) Symbol Par ..
TSM1121IN ,3.3V 5V 12V HOUSEKEEPING ICfeatures which allow safeoperation in all conditions, and very high systemVS12 3 12 PGintegration. ..
TSM112CD ,3.3V 5V 12V HOUSEKEEPING ICfeatures which allow safe oper-ation in all conditions, and very high system inte- VS5 2 13 FAULTgr ..
TSM112CD ,3.3V 5V 12V HOUSEKEEPING ICABSOLUTE MAXIMUM RATINGS Symbol DC Supply Voltage Value Unit1)Vcc 25 VDC Supply Voltage Iout O ..
TSM112CDT ,3.3V 5V 12V HOUSEKEEPING ICTSM1123.3V 5V 12V HOUSEKEEPING IC ■ OVER VOLTAGE PROTECTION FOR 3.3V 5V AND 12V WITHOUT EXTE ..
TSM112CN ,3.3V 5V 12V HOUSEKEEPING ICTSM1123.3V 5V 12V HOUSEKEEPING IC ■ OVER VOLTAGE PROTECTION FOR 3.3V 5V AND 12V WITHOUT EXTE ..
UC282TD-3 ,1maximum ratings over operating free-air temperature (unless otherwise noted)VB . . . . . . . . . . ..
UC282TD-ADJ ,1maximum ratings” may cause permanent damage to the device. These are stress ratings only, andfuncti ..
UC282TDKTTT-1 ,1electrical characteristics, T = −40°C to 100°C for the UC282-X series and 0°C to 100°C for theAUC38 ..
UC282TDKTTT-1 ,1electrical characteristics, T = −40°C to 100°C for the UC282-X series and 0°C to 100°C for theAUC38 ..
UC282TDKTTT-ADJ ,1maximum ratings over operating free-air temperature (unless otherwise noted)VB . . . . . . . . . . ..
UC282TDTR-1 ,1               SLU ..


TSM1121ID-TSM1121IN
3.3V 5V 12V HOUSEKEEPING IC
Over voltage protection for 3.3V 5V and 12V without external components Under voltage protection for 3.3V 5V and
12V without external components
Over voltage protection for -12V or -5V with
external components
Externally adjustable under voltage
blanking during power up
Power good input/output Externally adjustable pg delay Fault output Remote output Externally adjustable remote delay Precision voltage reference 2kV ESD protection
DESCRIPTION

The TSM1121 integrated circuit incorporates all
sensing circuitry to regulate and protect from over
voltage and under voltage a multiple output power
supply (3.3V, 5V and 12V).
TSM1121 incorporates all the necessary functions
for Housekeeping features which allow safe
operation in all conditions, and very high system
integration.
TSM1121 integrates a precise voltage reference.
APPLICATION
PC SMPS triple power line housekeeping ic
(3.3V 5V 12V)
ORDER CODE

Note: N = Dual in Line Package (DIP)
D = Small Outline Package (SO) - also available in Tape &

Reel (DT)

PIN CONNECTIONS (top view)
TSM1121

3.3V 5V 12V HOUSEKEEPING IC
TSM1121 Pin Description PIN DESCRIPTION
ABSOLUTE MAXIMUM RATINGS
OPERATING CONDITIONS
Over and Under Voltage Inputs can go higher than Vcc within the allowed Max Rating range All voltage values, except differential voltage are with respect to network ground terminal.
Electrical Characteristics TSM1121
2 ELECTRICAL CHARACTERISTICS

Tamb = 25°C and Vcc = 17V (unless otherwise specified) Do not short circuit the Vref Pin
TSM1121 Electrical Characteristics
Fig. 1: Application Schematic
Fig. 2: Internal Schematic
Electrical Characteristics TSM1121
Fig. 3: Detailed Internal Schematic
TSM1121: Housekeeping IC.
TSM1121 is a one chip solution for all PC SMPS:
it integrates on one chip the Housekeeping
Circuitry (Over Voltage and Under Voltage
protections, with adequate sequencing).
Triple Power Line Protection

The TSM1121 Housekeeping Circuit is dedicated
to 3.3V, 5V and 12V power lines protection. It
integrates a Precision Voltage Reference, a Triple
Over Voltage Protection Circuit and a Triple
Under Voltage Protection Circuit as well as all the
necessary logic and transient timing management
circuits for optimal and secure communication
with the motherboard, during start up, switch off
and stabilized conditions.
Over Voltage Protection

The Over Voltage Protection Circuit is made of
three comparators with internal voltage thresholds
(Vov33, Vov5, Vov12) which do not require any
external components for proper operation. The
outputs of these three comparators are ORed.
Under Voltage Protection

The Under Voltage Protection Circuit is made of
three comparators with internal voltage thresholds
(Vuv33, Vuv5, Vuv12) which do not require any
external components for proper operation. The
outputs of these three comparators are ORed,
and blanked by an internal delay circuitry (Power
Up Blanking - Tuv) which can be adjusted with an
external capacitor (Cuv). This allows that during
power up, the under voltage protection circuit is
inhibited.
Latch OFF

The Over Voltage and Under Voltage Circuits
outputs are again ORed before activating a latch.
When activated, this latch commands the full
switch OFF of the three main power lines (3.3V,
5V, 12V) by an external link between the
housekeeping and the primary PWM circuits via
the main optocoupler or any other device . Note
that the Under Voltage Circuit, after Power Up UV
blanking, bears no other delay to the latch setting
input whereas the Over Voltage circuit bears an
additional Tfault delay time. This allows an
efficient protection against Output Short Circuit
conditions.
Power Good

The Over Voltage and Under Voltage Circuits are
Ored to switch the Power Good output active (PG)
to warn the motherboard that the voltage of at
least one of the three power lines is out of range.
The PG activation bears an internal Tpg delay
circuitry which can be adjusted with an external
capacitor (Cpg).
Remote Control

Thanks to this information link to the motherboard,
a resetting signal to the latch is achievable with
the Remote pin (REM). When the Remote pin is
active, the external Fault link between
Housekeeping circuit and the PWM generator is
active (high = PWM OFF) and the PG pin is active
(high). Note that to reset effectively the latch, a
minimum width Remote pulse should be applied
thanks to an internal delay circuitry (Trem) which
can be adjusted with an external capacitor
(Crem).
TSM1121

Principle of Operation and Application Hints
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