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TPS40074 Datasheet(PDF) 11 Page - Texas Instruments |
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TPS40074 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 38 page www.ti.com UNDERVOLTAGE LOCKOUT THRESHOLDS vs FEED FORWARD IMPEDANCE 6 2 4 12 8 10 18 14 16 20 90 150 180 210 270 120 240 60 30 UVLO VON UVLO VOFF RKFF − Feed−Forward Impedance − kΩ FSW = 500 kHz 0 360 90 150 180 210 270 330 120 240 390 300 6 2 4 12 8 10 18 14 16 20 UNDERVOLTAGE LOCKOUT THRESHOLDS vs FEED FORWARD IMPEDANCE RKFF − Feed−Forward Impedance − kΩ UVLO VON UVLO VOFF FSW = 300 kHz 6 2 4 12 8 10 18 14 16 20 90 150 180 120 60 30 UNDERVOLTAGE LOCKOUT THRESHOLDS vs FEED FORWARD IMPEDANCE RKFF − Feed−Forward Impedance − kΩ UVLO VON UVLO VOFF FSW = 750 kHz TPS40074 SLUS617–APRIL 2005 APPLICATION INFORMATION (continued) Figure 5. Figure 6. Figure 7. The programmable UVLO circuit incorporates 20% hysteresis from the start voltage to the shutdown voltage. For example, if the startup voltage is programmed to be 10 V, the controller starts when VDD reaches 10 V and shuts down when VDD falls below 8 V. The maximum duty cycle begins to decrease as the input voltage rises to twice the startup voltage. Below this point, the maximum duty cycle is as specified in the electrical table. Note that with 11 |
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