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TPS40070 Datasheet(PDF) 7 Page - Texas Instruments |
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TPS40070 Datasheet(HTML) 7 Page - Texas Instruments |
7 / 10 page www.ti.com APPLICATION INFORMATION MINIMUM PULSE WIDTH SETTING THE SWITCHING FREQUENCY (PROGRAMMING THE CLOCK OSCILLATOR) RT + 1 fSW(kHz) 17.82 10*6 * 23 kW (1) 100 1.5 0.5 1000 200 300 400 500 600 700 800 900 1.0 3.0 2.0 2.5 4.5 3.5 4.0 5.0 MINIMUM OUTPUT VOLTAGE vs FREQUENCY fOSC - Oscillator Frequency - kHz VIN = 28 V VIN = 24 V VIN = 18 V VIN = 15 V VIN = 12 V VIN = 10 V VIN = 8 V VIN = 5 V fSW - Switching Frequency - kHz SWITCHING FREQUENCY vs TIMING RESISTANCE 0 100 0 200 400 600 800 1000 200 300 400 500 600 TPS40070 TPS40071 SLUS582D–DECEMBER 2003–REVISED NOVEMBER 2004 The TPS40070 family of parts allows the user to construct synchronous voltage-mode buck converters with inputs ranging from 4.5 V to 28 V and outputs as low as 700 mV. Predictive gate drive circuitry optimizes switching delays for increased efficiency and improved converter output power capability. Voltage feed-forward is employed to ease loop compensation and provide better line transient response. A converter based on the TPS40070 operates as a single quadrant (source only) converter at all times. When the rectifier FET is on and the controller senses that current is near zero in the inductor, the rectifier FET is turned off, preventing the buildup of negative or reverse current in the inductor. This feature prevents the converter from pulling energy from its output and forcing that energy onto its input. Converters based on the TPS40071 operates as a two quadrant converter all the time (source and sink current). This is the controller of choice for most applications. The TPS4007x devices have limitations on the minimum pulse width that can be used to design a converter. Reliable operation is guaranteed for nominal pulse widths of 250 ns and above. This places some restrictions on the conversion ratio that can be achieved at a given switching frequency. Figure 1 shows minimum output voltage for a given input voltage and frequency. The TPS4007x has independent clock oscillator and PWM ramp generator circuits. The clock oscillator serves as the master clock to the ramp generator circuit. Connecting a single resistor from RT to ground sets the switching frequency of the clock oscillator. The clock frequency is related to RT by: Figure 1. Figure 2. 7 |
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