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TPS40057 Fiches technique(PDF) 9 Page - Texas Instruments |
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TPS40057 Fiches technique(HTML) 9 Page - Texas Instruments |
9 / 37 page 10 0.2 0 20 15 25 30 40 35 0.4 1.0 0.8 1.2 0.6 V UVLO – Undervoltage Lockout Threshold – V UDG-02132 Clock PWM RAMP PowerGood VIN UVLO Threshold 1 2 3 4 5 6 7 1 2 3 4 5 6 7 1 2 TPS40054 TPS40055 TPS40057 www.ti.com SLUS593H – DECEMBER 2003 – REVISED JULY 2012 Figure 4. Undervoltage Lockout Operation The tolerance on the UVLO set point also affects the maximum duty cycle achievable. If the UVLO starts the device at 10% below the nominal start-up voltage, the maximum duty cycle is reduced approximately 10% at the nominal start-up voltage. The impedance of the input voltage can cause the input voltage, at the controller, to sag when the converter starts to operate and draw current from the input source. Therefore, there is voltage hysteresis that prevents nuisance shutdowns at the UVLO point. With RT chosen to select the operating frequency and RKFF chosen to select the start-up voltage, the approximate amount of hysteresis voltage is shown in Figure 5. UNDERVOLTAGE LOCKOUT THRESHOLD vs HSYTERESIS Figure 5. Copyright © 2003–2012, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Link(s): TPS40054 TPS40055 TPS40057 |
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