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TPS40140 Datasheet(PDF) 20 Page - Texas Instruments |
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TPS40140 Datasheet(HTML) 20 Page - Texas Instruments |
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20 / 65 page  www.ti.com 5.17 OVERTEMPERATURE 5.18 FAULT MASKING OPERATION 5.19 PROTECTION AND FAULT MODES 5.20 SETTING THE SWITCHING FREQUENCY R+1.33 39.2 10 3 ƒ*1.041 PH *7 ; (6) TPS40140 DUAL OR 2-PHASE, STACKABLE CONTROLLER SLUS660A – SEPTEMBER 2005 – REVISED JULY 2006 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. 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. There are modes of normal operation during start up and shut down as well various fault modes that may be detected. It is often necessary to know the state of the upper and lower MOSFETs in these modes. Table xx shows a summary of these modes and the state of the MOSFETs. A description of each mode follows the table. Table 5-1. Fault Mode Summary MODE UPPER MOSFET LOWER MOSFET PROGRAMMABLE UVLO_CEx = LOW OFF OFF POWER ON RESET: FIXED UVLO, BP5 < 4.25V OFF OFF OVERCURRENT OFF, HICCUP MODE OFF, HICCUP MODE OUTPUT UNDERVOLTAGE OFF, HICCUP MODE OFF, HICCUP MODE OUTPUT OVERVOLTAGE, PRIOR TO PWM SWITCHING OFF OFF OUTPUT OVERVOLTAGE, WHILE PWM SWITCHING PWM SWITCHING PWM SWITCHING CLKFLT, MISSING CLKIO AT SLAVE OFF OFF PHSEL VOLTAGE > 4V, or open to ground OFF OFF OVERTEMPERATURE OFF OFF The clock frequency is programmed by the value of the timing resistor connected from the RT pin to ground. See Equation 6. This equation gives the frequency for an 8-phase system. For a 6-phase system the frequency is 1 1/3 times higher. f PH is a single phase frequency, kHz. The Rt resistor value is expressed in kΩ. See Figure 5-6. APPLICATION INFORMATION 20 Submit Documentation Feedback |
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