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TPS40140RHHRG4 Datasheet(PDF) 34 Page - Texas Instruments |
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TPS40140RHHRG4 Datasheet(HTML) 34 Page - Texas Instruments |
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34 / 68 page  0 50 100 150 200 250 300 350 400 450 100 200 300 400 500 600 700 800 900 1000 Phase Switching Frequency (kHz) C001 ( ) 1.058 PH 3 R 1.33 39.2 10 ƒ 7 , - = ´ ´ ´ - TPS40140 SLUS660I – SEPTEMBER 2005 – REVISED JANUARY 2015 www.ti.com 9.1.13 PHSEL Pin Fault The PHSEL pin is normally terminated with a resistor string, or tied directly to ground. If this string becomes open, the PHSEL pin voltage is pulled up internally to greater than 4 V. The controller enters a ‘Standby’ mode. The upper and lower MOSFETs are turned off but the internal 5-V regulator is still active and VREG is present. If the PHSEL connection is restored, normal operation continues after 64 PWM clock cycles. 9.1.14 Overtemperature If the temperature of the controller die is detected to be above 155°C, the upper and lower MOSFETs are turned off and the 5-V regulator, VREG, is turned off. When the die temperature decreases 30°C the controller performs a normal start-up. 9.1.15 Fault Masking Operation If the TRKx pin voltage is externally limited below the 1.4-V threshold, the controller does not respond to an Undervoltage fault and the PGOOD output remains low. Other fault modes remain operational. The overcurrent protection continues to terminate PWM cycle every time the threshold is exceeded, but the hiccup mode is not entered. 9.1.16 Setting the Switching Frequency The clock frequency is programmed by the value of the timing resistor connected from the RT pin to ground. See Equation 7. This equation gives the frequency for an 8-phase system. For a 6-phase system the frequency is 1 1/3 times higher. where • ƒPH is a single-phase frequency, kHz • The Rt resistor value is expressed in kΩ (7) See Figure 34. Figure 34. Phase Switching Frequency vs Timing Resistance 34 Submit Documentation Feedback Copyright © 2005–2015, Texas Instruments Incorporated Product Folder Links: TPS40140 |
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