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TSM111CD 数据表(PDF) 14 Page - STMicroelectronics |
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TSM111CD 数据表(HTML) 14 Page - STMicroelectronics |
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14 / 18 page  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 Ω, C1=4.7µF => Tsur=21ms Thanks to the Tsur adjustment, the normal surge currents which occur during power up (capacitive EVALUATION BOARD - TECHNICAL NOTICE Vs 3 3 1 Is 3 3 20 Is 5 19 Vs 5 2 Is 1 2 18 Vs 1 2 3 Vr e f M a i n 14 Fb m a i n 15 Vr e f Au x 13 Fb A u x 12 PG 9 Tpor 10 Rem 7 TR e m 8 Ad j 4 Gn d 16 Vc c 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 1 J8 Out12V 1 J9 Out5V 1 J10 Out3.3V PG 1 2 J11 PG 12 34 SW1 BP Rem 1 2 J12 Rem Fro m c 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 2 J20 D5 D6 I 1INV 1 2 J18 OptMain OptMain Vin 2 GN D 1 Vout 3 U2 78L05 5Vstby + C7 R11 5Vstby In5V IN12V EVALUATION BOARD - ELECTRICAL SCHEMATIC C6 TSM111 14/18 |
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