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LMR16006XDDCR データシート(PDF) 10 Page - Texas Instruments

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部品番号 LMR16006XDDCR
部品情報  LMR16006 SIMPLE SWITCHER짰 60 V 0.6 A Buck Regulators With High Efficiency ECO
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ホームページ  http://www.ti.com
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LMR16006
SNVSA24 – OCTOBER 2014
www.ti.com
Product Folder Links: LMR16006
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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.


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