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LMZ14202EXTTZ Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LMZ14202EXTTZ Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 10 page  LMZ1420xEXT / LMZ1200xEXT Evaluation Board National Semiconductor Application Note 2084 Alan Martin August 16, 2010 Introduction The LMZ1420xEXT and LMZ1200xEXT SIMPLE SWITCH- ER® power modules are easy-to-use DC-DC solution capa- ble of driving up to a 3A load with exceptional power conversion efficiency, output voltage accuracy, line and load regulation. They are available in an innovative package that enhances thermal performance and allows for hand or ma- chine soldering. The LMZ14203EXT/2EXT/1EXT can accept an input voltage rail between 6V and 42V and the LMZ12003EXT/2EXT/1EXT can accept an input voltage rail between 4.5V and 20V. The devices can deliver an adjustable and highly accurate output voltage as low as 0.8V and as high as 6V. The control struc- ture is constant on-time with input voltage feed forward. This creates a nearly constant switching frequency across the in- put voltage range. The control loop operates well with low ESR output capacitors such as ceramics. An output feed-for- ward capacitor across the upper feedback resistor trims for optimum transient response. The precision enable input al- lows for programmable UVLO of the input supply. The exter- nal soft-start capacitor facilitates controlled startup output rise time. The LMZ1420xEXT and LMZ1200xEXT family is a reli- able and robust solution with the following features: lossless cycle-by-cycle valley current limit to protect for over current or short-circuit fault, thermal shutdown, input under-voltage lock-out, and will start up into a pre-biased output. The LMZ1420xEXT and LMZ1200xEXT families are shock and vibration certified and rated for operation down to –55°C. Board Specifications • LMZ1420xEXT V IN = 6V to 42V • LMZ1420xEXT enable UVLO = 8V • LMZ1420xEXT V OUT = 3.3V • LMZ1200xEXT V IN = 4.5V to 20V • LMZ1200xEXT enable UVLO = 4.5V • LMZ1200xEXT V OUT = 1.8V • Operates at full load up to 80°C ambient at 12V input • θ JA = 20°C / W, θJC = 1.9°C / W • Designed on four layers, all four layers are 1 oz. copper weight • The two internal ground planes are identical • Measures 1.705 in. x 3.03 in. (4.33 cm x 7.7cm) and is 62mil (.062”) thick of FR4 laminate material For additional circuit modifications refer to the Design Con- sideration section of the LMZ1420xEXT or LMZ1200xEXT data sheet. For negative output voltage connections see AN-2027. Additional Footprints Additional component mounting pads are available to exper- iment with alternative Cin and Cout combinations or a zener clamp on the enable input. See Figure 6 for corresponding schematic locations. 30131501 FIGURE 1. Evaluation Board Schematic (LMZ1200xEXT 1.8V application values shown in parentheses) © 2010 National Semiconductor Corporation 301315 www.national.com |
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