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TPS62231-Q1 Datasheet(PDF) 9 Page - Texas Instruments |
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TPS62231-Q1 Datasheet(HTML) 9 Page - Texas Instruments |
9 / 25 page ( ) IN OUT OUT DS(on) L V min = V max + I max R max+ R ´ I = 0.5 x I OUT_PFM/PWM LPFMpeak IN OUT LPFMpeak ONmin (V V ) I = t L - ´ 9 TPS62231-Q1, TPS622314-Q1 www.ti.com SLVSB63A – DECEMBER 2011 – REVISED MARCH 2016 Product Folder Links: TPS62231-Q1 TPS622314-Q1 Submit Documentation Feedback Copyright © 2011–2016, Texas Instruments Incorporated Device Functional Modes (continued) • VIN= Input voltage (V) (1) Therefore, use Equation 2 to calculate the approximate peak inductor current in PFM mode. where • ILPFMpeak = PFM inductor peak current (mA) • L = Inductance (µH) (2) Use Equation 3 to estimate the transition from PFM into PWM mode and from PWM into PFM. where • IOUT_PFM/PWM = Output current for transition from PFM to PWM mode and transition from PWM to PFM mode (mA) (3) 7.4.3 Forced PWM Mode Pulling the MODE pin high forces the converter to operate in a continuous-conduction PWM mode even at light load currents. The advantage is that the converter operates with a quasi-fixed frequency that allows simple filtering of the switching frequency for noise-sensitive applications. In this mode, the efficiency is lower compared to the power save mode during light loads. For additional flexibility, switch from power save mode to forced PWM mode during operation. This switching allows for efficient power management by adjusting the operation of the converter to the specific system requirements. 7.4.4 100% Duty-Cycle Low-Dropout Operation The device starts to enter 100% duty-cycle mode when the input voltage comes close to the nominal output voltage. To maintain the output voltage, the high-side switch is turned on 100% for one or more cycles. With further decreasing VIN, the high-side MOSFET switch is turned on completely. In this case the converter offers a low input-to-output voltage difference which is particularly useful in battery-powered applications to achieve the longest operation time by taking full advantage of the whole battery voltage range. Use Equation 4 to calculate the minimum input voltage to maintain regulation which is dependent on the load current and output voltage. where • VOUTmax = nominal output voltage plus maximum output-voltage tolerance • IOUTmax = maximum output current plus inductor ripple current • RDS(on)max = maximum P-channel switch RDSon • RL = DC resistance of the inductor (4) 7.4.5 Short-Circuit Protection The device integrates a high-side and low-side MOSFET current limit to protect the device against heavy load or short circuit. The current in the switches is monitored by current-limit comparators. When the current in the P- channel MOSFET reaches the current limit, the P-channel MOSFET is turned off and the N-channel MOSFET is turned on to ramp down the current in the inductor. The high-side MOSFET switch can only turn on again when the current in the low-side MOSFET switch has decreased below the threshold of the current-limit comparator. |
Similar Part No. - TPS62231-Q1_16 |
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Similar Description - TPS62231-Q1_16 |
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