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TPS40061 Datasheet(PDF) 7 Page - Texas Instruments |
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TPS40061 Datasheet(HTML) 7 Page - Texas Instruments |
7 / 37 page UDG-02131 RAMP COMP SW VIN VIN SW COMP RAMP VPEAK VVALLEY T2 tON1 > tON2 and d1 > d2 tON2 tON1 d + t ON T T1 R T + 1 f SW 17.82 10*6 * 23 kW TPS40060 TPS40061 www.ti.com SLUS543F – DECEMBER 2002 – REVISED JUNE 2013 APPLICATION INFORMATION The TPS40060/61 family of parts allows the user to optimize the PWM controller to the specific application. The TPS40061 is the controller of choice for synchronous buck designs which will include most applications. It has two quadrant operation and will source or sink output current. This provides the best transient response. The TPS40060 operates in one quadrant and sources output current only, allowing for paralleling of converters and ensures that one converter does not sink current from another converter. This controller also emulates a standard buck converter at light loads where the inductor current goes discontinuous. At continuous output inductor currents the controller operates as a synchronous buck converter to optimize efficiency. SW NODE RESISTOR The SW node of the converter will be negative during the dead time when both the upper and lower MOSFETs are off. The magnitude of this negative voltage is dependent on the lower MOSFET body diode and the output current which flows during this dead time. This negative voltage could affect the operation of the controller, especially at low input voltages. Therefore, a 10- Ω resistor must be placed between the lower MOSFET drain and pin 12 (SW) of the controller as shown in Figure 14 as RSW. SETTING THE SWITCHING FREQUENCY (PROGRAMMING THE CLOCK OSCILLATOR) The TPS40060 and TPS40061 have independent clock oscillator and ramp generator circuits. The clock oscillator serves as the master clock to the ramp generator circuit. The switching frequency, fSW in kHz, of the clock oscillator is set by a single resistor (RT) to ground. The clock frequency is related to RT, in kΩ by Equation 1 and the relationship is charted in Figure 2. (1) PROGRAMMING THE RAMP GENERATOR CIRCUIT The ramp generator circuit provides the actual ramp used by the PWM comparator. The ramp generator provides voltage feed-forward control by varying the PWM ramp slope with line voltage, while maintaining a constant ramp magnitude. Varying the PWM ramp directly with line voltage provides excellent response to line variations since the PWM does not have to wait for loop delays before changing the duty cycle. (See Figure 1). Figure 1. Voltage Feed-Forward Effect on PWM Duty Cycle Copyright © 2002–2013, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Links: TPS40060 TPS40061 |
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