поискавой системы для электроныых деталей |
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TPS5120-EP датащи(PDF) 6 Page - Texas Instruments |
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TPS5120-EP датащи(HTML) 6 Page - Texas Instruments |
6 / 23 page TPS5120EP DUAL OUTPUT, TWOPHASE SYNCHRONOUS BUCK DC/DC CONTROLLER SGLS224A − JANUARY 2004 − REVISED APRIL 2006 6 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 detailed description (continued) overvoltage protection For overvoltage protection (OVP), the TPS5120 monitors INV pin voltage. When the INV voltage is higher than 0.95 V (+12%), the OVP comparator output goes high and the FLT timer starts to charge an external capacitor connected to FLT. After a set time, the FLT circuit latches the MOSFET drivers off. undervoltage protection For undervoltage protection (UVP), the TPS5120 monitors INV pin voltage. When the INV voltage is lower than 0.68 V (−19.4%), the OVP comparator output goes high, and the FLT timer starts to charge an external capacitor connected to FLT. Also, when the current comparator triggers the OCP, the UVP comparator detects the under voltage output and starts the FLT capacitor charge. After a set time, the FLT circuit latches off all of the MOSFET drivers. FLT When an OVP or UVP comparator output goes high, the FLT circuit starts to charge the FLT capacitor. If the FLT pin voltage goes beyond a constant level, the TPS5120 latches the MOSFET drivers. At this time, the state of MOSFET is different depending on the OVP alert and the UVP alert. Also, the enable time used to latch the MOSFET driver is decided by the capacity of the FLT capacitor. The charging constant current value is also different depending on whether it is an OVP alert or a UVP alert. The difference is shown in the following equation: FLT source current (OVP) = FLT source current (UVP) × 5 shutdown The TPS5120 can be shut down by grounding STBY1, STBY2, and 5V_STBY. The shutdown current is as low as 1 µA. UVLO When the input voltage goes up to about 4 V, the TPS5120 is operational. When the input voltage is lower than the turnon value, the device is turned off. The typical hysteresis voltage is 40 mV. phase Inverter Phase inverter controls the phase of SMPS1 and SMPS 2. SMPS1 operates in phase with the OSC. SMPS2 operates 180 ° out of phase from SMPS1. This allows smaller input capacitors to be used. oscillator TPS5120 has a triangle oscillator generator internal to the IC. The oscillation frequency is set by the size of the capacitor connected to the CT pin. The voltage amplitude is 0.43 V ~ 1.17 V. |
Аналогичный номер детали - TPS5120-EP |
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Аналогичное описание - TPS5120-EP |
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