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TPS5103IDBR Fiches technique(PDF) 4 Page - Texas Instruments |
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TPS5103IDBR Fiches technique(HTML) 4 Page - Texas Instruments |
4 / 37 page TPS5103 MULTIPLE MODE SYNCHRONOUS DC/DC CONTROLLER SLVS240 – SEPTEMBER 1999 4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 detailed description REF The reference voltage is used for the output voltage setting and the voltage protection(COMP). The tolerance is 1.5% typically. VREF5 An internal linear voltage regulator is used for the high-side driver bootstrap voltage. Since the input voltage range is from 4.5 V to 25 V, this voltage offers a fixed voltage for the bootstrap voltage so that the design for the bootstrap is much easier. The tolerance is 6%. hysteretic comparator The hysteretic comparator is used to regulate the output voltage of the synchronous-buck converter. The hysteresis is set internally and is typically 9.7 mV. The total delay time from the comparator input to the driver output is typically 400 ns for going both high and low. error amplifier The error amplifier is used to sense the output voltage of the synchronous buck converter. The negative input of the error amplifier is connected to the Vref voltage(1.185 V) with a resistive divider network. The output of the error amplifier is brought out to the FB terminal to be used for loop gain compensation. 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 driver is typically 1.2 A at sink current, –1.5 A at source current. 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 sink current, –1.7 A at source current. When configured as a floating driver, the bias voltage to the driver is developed from the VREF5, limiting the maximum drive voltage between OUT_u and LL to 5 V. The maximum voltage that can be applied between LH and OUTGND is 30 V. driver deadtime control The deadtime control prevents shoot-through current from flowing through the main power FETs. During switching transitions the deadtime control actively controls the turnon time of the MOSFET drivers. The typical deadtime from the low-side-driver-off to the high-side-driver-on is 90 ns, and 110 ns from high-side-driver-off to low-side-driver-on. COMP COMP is designed for use with a regulation output monitor. COMP also functions as an internal comparator used for any voltage protection such as the input under voltage protection. If the input voltage is lower than the setpoint, the comparator turns off and prevents external parts from damage. The investing terminal of the comparator is internally connected to REF(1.185 V). current protection Current protection is achieved by sensing the high-side power MOSFET drain-to-source voltage drop during on-time through VCC_SENSE and LL terminals. An external resistor between Vin and TRIP terminal with the internal current source connected to the current comparator negative input adjusts the current limit. The typical internal current source value is 15 µA in PWM mode, 5 µA in SKIP mode. When the voltage on the positive terminal is lower than the negative terminal, the current comparator turns on the trigger, and then activates the oscillator. This oscillator repeatedly reset the trigger until the over current condition is removed. The capacitor on the CT terminal can be open or added to adjust the reset frequency. |
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