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TSM1121 Datasheet(PDF) 6 Page - STMicroelectronics |
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TSM1121 Datasheet(HTML) 6 Page - STMicroelectronics |
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6 / 11 page  6/11 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 |
Similar Part No. - TSM1121 |
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Similar Description - TSM1121 |
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