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LMZ21701 Arkusz danych(PDF) 8 Page - Texas Instruments |
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LMZ21701 Arkusz danych(HTML) 8 Page - Texas Instruments |
8 / 37 page CONTROL LOGIC 2.2µH HIGH SIDE CURRENT LIMIT LOW SIDE CURRENT LIMIT UVLO VREF + - tON TIMER DIRECT CONTROL & COMPENSATION ERROR AMPLIFIER COMPARATOR 6.6V CLAMP FB VOS PG VOUT VIN EN SS GND 400k SOFTSTART CURRENT AND TRACKING 5V LDO THERMAL SHUTDOWN LDO BYPASS HIGH SIDE SWITCH LOW SIDE SWITCH INDUCTOR 25pF ZERO CURRENT DETECT LOW SIDE DRIVER HIGH SIDE DRIVER WITH INTERNAL BOOTSTRAP CFF LMZ21701 SNVS853D – AUGUST 2012 – REVISED NOVEMBER 2014 www.ti.com 8 Detailed Description 8.1 Overview The LMZ21701 SIMPLE SWITCHER® Nano Module is an easy-to-use step-down DC-DC solution capable of driving up to 1000 mA load in space-constrained applications. Only an input capacitor, an output capacitor, a softstart capacitor, and two resistors are required for basic operation. The Nano Module comes in 8-pin DFN footprint package with an integrated inductor. The LMZ21701 architecture is based on DCS-Control™ (Direct Control with Seamless Transition into Power Save Mode). This architecture combines the fast transient response and stability of hysteretic type converters along with the accurate DC output regulation of voltage mode and current mode regulators. The LMZ21701 architecture uses Pulse Width Modulation (PWM) mode for medium and heavy load requirements and Power Save Mode (PSM) at light loads for high efficiency. In PWM mode the switching frequency is controlled over the input voltage range. The value depends on the output voltage setting and is typically reduced at low output voltages to achieve higher efficiency. In PSM the switching frequency decreases linearly with the load current. Since the architecture of the device supports both operation modes (PWM and PSM) in a single circuit building block, the transition between the modes of operation is seamless with minimal effect on the output voltage. 8.2 Functional Block Diagram 8 Submit Documentation Feedback Copyright © 2012–2014, Texas Instruments Incorporated Product Folder Links: LMZ21701 |
Podobny numer części - LMZ21701 |
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Podobny opis - LMZ21701 |
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