Datenblatt-Suchmaschine für elektronische Bauteile |
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TS3552 Datenblatt(PDF) 4 Page - Taiwan Semiconductor Company, Ltd |
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TS3552 Datenblatt(HTML) 4 Page - Taiwan Semiconductor Company, Ltd |
4 / 11 page TS3552 2A/350kHz Synchronous Buck DC/DC Converter 4/11 Version: B11 Function Description The TS3552 is a constant frequency current mode step-down synchronous DC/DC converter. It regulates input voltage from 4.75V to 23V, down to an output voltage as low as 0.925V, and can provide 2A of continuous load current. Control Loop During normal operation, the output voltage is sensed at FB pin through a resistive voltage divider and amplified through the error amplifier. The voltage of error amplifier output pin – COMP is compared to the switch current to controls the RS latch. At each cycle, the high side NMOS would be turned on when the oscillator sets the RS latch and would be turned off when current comparator resets the RS latch. When the load current increases, the FB pin voltage drops below 0.925V, it causes the COMP voltage increase until average inductor current arrive at new load current. Enable The TS3552 EN pin provides digital control to turn on/turn off the regulator. When the voltage of EN exceeds the threshold voltage, the regulator starts the soft start function. If the EN pin voltage is below than the threshold voltage, only the bandgap voltage is alive. If the EN pin voltage is below than the shutdown threshold voltage, the regulator will be disable and into the shutdown mode. Maximum Load Current The maximum load current decreases at lower input voltage because of large IR drop on the high side switch and low side switch. The slope compensation signal reduces the peak inductor current as a function of the duty cycle to prevent sub-harmonic oscillations at duty cycles greater than 50%. Output Over Voltage Protection When the FB pin voltage exceeds 20% of the regulation voltage, the output over voltage protection function will discharge the COMP pin and the SS pin to GND, turning the high side MOSFET off. Input Under Voltage Lockout When the TS3552 power on, the internal circuits are held inactive until VIN exceeds the input UVLO threshold voltage. And the regulator will be disabled when VIN below the input UVLO threshold voltage. The hysteretic of the UVLO comparator is 400 mV. Short Circuit Protection The TS3552 provides short circuit protection function to prevent the device damage from short condition. When the output short to ground, the oscillator frequency is reduced to prevent the inductor current increasing beyond the current limit. In the meantime, the current limit is also reduced to lower the short current. Once the short condition is removed, the frequency and current limit will return to normal. Over Temperature Protection The TS3552 incorporates an over temperature protection circuit to protect itself from overheating. When the junction temperature exceeds the thermal shutdown threshold temperature, the regulator will be shutdown. Compensation The stability of the feedback circuit is controlled through COMP pin. The compensation value of the application circuit is optimized for particular requirements. If different conversions are requires, some of the components may need to be changes to ensure stability . |
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