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TPS5120EVM-151 датащи(PDF) 5 Page - Texas Instruments |
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TPS5120EVM-151 датащи(HTML) 5 Page - Texas Instruments |
5 / 20 page TPS5120 DUAL OUTPUT, TWOPHASE SYNCHRONOUS BUCK DC/DC CONTROLLER SLVS278E – AUGUST 2000 – REVISED MARCH 2003 5 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 Terminal Functions (Continued) TERMINAL I/O DESCRIPTION NAME NO. I/O DESCRIPTION TRIP2 23 I External resistor connection for CH2 output current control VCC 24 Supply voltage input VREF5 22 O 5-V internal regulator output 5V_STBY 6 I 5-V linear regulator control detailed description switching-mode power supply (SMPS) 1, 2 TPS5120 includes dual SMPS controllers that operate 180 ° out of phase and at the same frequency. Both channels have standby and softstart. 5-V regulator An internal linear voltage regulator is used for the high-side driver bootstrap voltage and source of VREF (0.85 V). When the 5-V regulator is disconnected from the MOSFET drivers, it is only used for the source of VREF. Since the input voltage range is from 4.5 V to 28 V, this feature offers a fixed voltage for the bootstrap voltage so that the drive design is much easier. It is also used for powering the low-side driver. The tolerance is 4%. The 5-V regulator is disabled when STBY1, STBY2, and 5V_STBY are all set low. 5-V switch If the internal 5-V switch senses the 5-V input from the REG5V_IN pin, the internal 5-V linear regulator is disconnected from the MOSFET drivers. The external 5 V is then used for both the low-side driver and the high-side bootstrap, thus, increasing the efficiency. error amplifier Each channel has its own error amplifier to regulate the output voltage of the synchronous buck converter. It is used in the PWM mode for the high output current condition (> 0.2 A). The unity gain bandwidth is 2.5 MHz. This decreases the amplifier delay during fast load transients and contributes to a fast transient response. skip comparator In skip mode, each channel has its own hysteretic comparator to regulate the output voltage of the synchronous buck converter. The hysteresis is set internally and is typically set at 9 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. The current rating of the driver is typically 1.5 A at source and sink. high-side driver The high-side driver is designed to drive low rds(on) N-channel MOSFETs. The current rating of the driver is 1.2 A at 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 OUTx_u and LLx to 5 V. The maximum voltage that can be applied between LHx and OUTGND is 33 V. deadtime Deadtime prevents shoot through current from flowing through the main power FETs during switching transitions by actively controlling the turnon time of the MOSFETs drivers. |
Аналогичный номер детали - TPS5120EVM-151 |
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Аналогичное описание - TPS5120EVM-151 |
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