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LMR16006XDDCR データシート(PDF) 10 Page - Texas Instruments |
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LMR16006XDDCR データシート(HTML) 10 Page - Texas Instruments |
10 / 25 page 10 LMR16006 SNVSA24 – OCTOBER 2014 www.ti.com Product Folder Links: LMR16006 Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated Feature Description (continued) output to a high voltage. Thus, requesting the maximum output current. Once the condition is removed, the regulator output rises and the error amplifier output transitions to the steady state duty cycle. In some applications, the power supply output voltage can respond faster than the error amplifier output can respond, this actuality leads to the possibility of an output overshoot. The OVTP feature minimizes the output overshoot, when using a low value output capacitor, by implementing a circuit to compare the FB pin voltage to OVTP threshold which is 108% of the internal voltage reference. If the FB pin voltage is greater than the OVTP threshold, the high side MOSFET is disabled preventing current from flowing to the output and minimizing output overshoot. When the FB voltage drops lower than the OVTP threshold, the high side MOSFET is allowed to turn on at the next clock cycle. 8.3.7 Thermal Shutdown The device implements an internal thermal shutdown to protect itself if the junction temperature exceeds 170°C(typ). The thermal shutdown forces the device to stop switching when the junction temperature exceeds the thermal trip threshold. Once the junction temperature decreases below 160°C(typ), the device reinitiates the power up sequence. 8.4 Device Functional Modes 8.4.1 Continuous Conduction Mode The LMR16006 steps the input voltage down to a lower output voltage. In continuous conduction mode (when the inductor current never reaches zero at CCM), the buck regulator operates in two cycles. The power switch is connected between VIN and SW. In the first cycle of operation the transistor is closed and the diode is reverse biased. Energy is collected in the inductor and the load current is supplied by Cout and the rising current through the inductor. During the second cycle the transistor is open and the diode is forward biased due to the fact that the inductor current cannot instantaneously change direction. The energy stored in the inductor is transferred to the load and output capacitor. The ratio of these two cycles determines the output voltage. The output voltage is defined approximately as: D = VOUT/VIN and D' = (1-D) where D is the duty cycle of the switch, D and D' will be required for design calculations. 8.4.2 ECO Mode The LMR16006 operates in ECO mode at light load currents to improve efficiency by reducing switching and gate drive losses. The LMR16006 is designed so that if the output voltage is within regulation and the peak switch current at the end of any switching cycle is below the sleep current threshold, IINDUCTOR ≤ 80 mA, the device enters ECO mode. For ECO mode operation, the LMR16006 senses peak current, not average or load current, so the load current where the device enters ECO mode is dependent on VIN, VOUT and the output inductor value. When the load current is low and the output voltage is within regulation, the device enters an ECO mode and draws only 28 µA input quiescent current. |
同様の部品番号 - LMR16006XDDCR |
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同様の説明 - LMR16006XDDCR |
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