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TPS5140PAGR датащи(PDF) 9 Page - Texas Instruments |
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TPS5140PAGR датащи(HTML) 9 Page - Texas Instruments |
9 / 59 page TPS5140 FOUR-CHANNEL DC/DC CONTROLLER FOR NOTEBOOK PC POWER SLVS305A – DECEMBER 2000 – REVISED JANUARY 2001 9 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 detailed description (continued) 3.3-V regulator TPS5140 has a 3.3-V linear regulator. The output is made from the internal 5 V regulator or external 5 V from REG5V_IN. The 3.3-V regulator has an output current limit. The maximum output current is 30 mA. 5-V switch If the internal 5-V switch senses a 5-V input from the REG5V_IN terminal, the internal 5-V linear regulator will be disconnected from the MOSFET drivers. The external 5 V will be used for both the low-side driver and the high-side bootstrap, thus increasing the efficiency. auto PWM/SKIP The PWM_SEL terminal selects either the auto PWM/SKIP or fixed PWM mode. If this terminal is lower than 0.5 V, the outputs operate in the fixed PWM mode. If 2.5 V (minimum) is applied, the outputs operate in auto PWM/SKIP mode. In the auto PWM/SKIP mode, the operation changes from the PWM mode to the SKIP mode automatically under light load conditions. Avoid using a MOSFET with very low rDS(on) if the auto SKIP function is implemented. error amp All three synchronous buck channels have their own error amplifier to regulate the output. The error amplifier is used in the PWM mode for high output current conditions (> 0.2 A). Voltage mode control is implemented. skip comparator In skip mode, all three synchronous buck channels have their own hysteresis comparator to regulate the output voltages. The hysteresis voltage is set internally and typically at 8.5 mV. The delay from the comparator input to the driver output is typically 1.2 µs. low-side driver The low-side driver is designed to drive low-rDS(on) n-channel MOSFETs. The maximum drive voltage is 5 V from VREF5. Ch1, 2, and 3 MOSFET driver capability is 1.5 A, source and sink. high-side driver The high-side driver is designed to drive low-rDS(on) n-channel MOSFETs. CH1 and CH2 MOSFET drivers have 1.2 A capability, source and sink. When configured as a floating driver, the bias voltage to the driver is developed from VREF5, limiting the maximum drive voltage between OUT_u and LL to 5 V. The maximum voltage that can be applied between LHx and OUTGND is 33 V. dead time Dead time prevents shoot-through current from flowing through the main power MOSFETs during switching transitions by actively controlling the turnon time of the MOSFETs drivers. current protection Current protection is achieved by sensing the drain-to-source voltage drop of the low-side power MOSFET during the low-side MOSFET’s on time at OUTGND and LL. An external resistor between VCC_ SENSE and TRIP terminal in series with the internal current source adjusts the current limit. When the voltage drop during the low-side MOSFET on-time is high enough, the current comparator triggers the current protection and the MOSFET drivers are turned off. After a programmable time delay, the SCP circuit latches off all MOSFET drivers. The internal current source tolerance is ±10%. CH2 monitors both high-side and low-side MOSFET voltage drops. |
Аналогичный номер детали - TPS5140PAGR |
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Аналогичное описание - TPS5140PAGR |
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