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TPS3513 Fiches technique(PDF) 6 Page - Texas Instruments |
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TPS3513 Fiches technique(HTML) 6 Page - Texas Instruments |
6 / 15 page TPS3513 PC POWER SUPPLY SUPERVISORS SLVS313 – FEBRUARY 2001 6 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 power-good and power-good delay (continued) Furthermore, motherboards should be designed to comply with the above recommended timing. If timings other than these are implemented or required, this information should be clearly specified. The TPS3513 family of power-supply supervisors provides a power-good output (PGO) for the 3.3-V and 5-V supply voltage rails and a separate power-good input (PGI). An internal timer is used to generate a 300-ms power-good delay. If the voltage signals at PGI, VS33, and VS5 rise above the undervoltage threshold, the open-drain, power-good output (PGO) will go high after a delay of 300 ms. When the PGI voltage or any of the 3.3-V, 5-V rail drops below the undervoltage threshold, PGO will be disabled immediately. power-supply remote on/off (PSON) and fault protect output (FPO) Since the latest personal computer generation focuses on easy turnon and power saving functions, the PC power supply will require two characteristics. One is a dc power supply remote on/off function; the other is standby voltage to achieve very low power consumption of the PC system. Thus, the main power needs to be shut down. The power supply remote on/off (PSON) is an active-low signal that turns on all of the main power rails including the 3.3-V, 5-V, –5-V, and –12-V power rails. When this signal is held high by the PC motherboard or left open circuited, the signal of the fault protect output (FPO) also goes high. Thus, the main power rails should not deliver current and should be held at 0 V. When the FPO signal is held high due to an occurring fault condition, the fault status will be latched and the outputs of the main power rails should not deliver current and should be held at 0 V. Toggling the power-supply remote on/off (PSON) from low-to-high will reset the fault-protection latch. During this fault condition only the standby power is not affected. When PSON goes from high to low or low-to-high, the 38-ms debounce block will be active to avoid that a glitch on the input will disable/enable the FPO output. During this period, the undervoltage function is disabled to prevent turnon failure. Power should be delivered to the rails only if the PSON signal is held at ground potential, thus, FPO is active low. The FPO pin can be connected to 5 VDC (or up to 15 VDC) through a pullup resistor. under-voltage protection The TPS3513 provides undervoltage protection (UVP) for the 12-V rail and undervoltage detect for the 3.3-V and 5-V rails. When an undervoltage condition appears at the VS12 input pin for more than 150 µs, the FPO output goes high and PGO goes low. Also, this fault condition will be latched until PSON is toggled from low-to-high or VDD is removed. In flyback or forward type off-line switching power supplies, usually designed for small power, the overload protection design is very simple. Most of these type of power supplies are only sensing the input current for an overload condition. The trigger-point needs to be set much higher than the maximum load in order to prevent false turnon. However, this will cause one critical issue. In case that the connected load is larger than the maximum allowable load but smaller than the trigger-point, the system will always become over-heated and cause failure and damage. |
Numéro de pièce similaire - TPS3513 |
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Description similaire - TPS3513 |
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