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LMZ34002 Folha de dados(PDF) 1 Page - Texas Instruments |
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LMZ34002 Folha de dados(HTML) 1 Page - Texas Instruments |
1 / 14 page SNVU297 – JULY 2013 Using the LMZ34002: Negative Output Voltage Simple Switcher® Power Module Evaluation Module 1 Introduction The LMZ34002EVM-001 Evaluation Module is designed as an easy-to-use platform that facilitates an extensive evaluation of the features and performance of the Simple Switcher® power module. This guide provides information on the correct usage of the EVM and an explanation of the numerous test points on the board. 2 Description The EVM features a LMZ34002 device configured for operation from a 4.5 V to 40 V input supply. The LMZ34002 is a non-synchronous, buck-boost (negative output) converter optimized for output voltages between -3 V and -17 V. The LMZ34002 operates at a fixed frequency of typically 800 kHz. The output voltage can be set to one of four popular values by using a simple configuration jumper. The EVM can supply up to 2 A of output current depending on the input and output voltage (See Figure 1). A minimal amount of input and output capacitance is used on the board. Component pads are provided for additional input and output capacitors if desired. Test points are provided that allow measurement of efficiency, power dissipation, input ripple, output ripple, line and load regulation, soft-start behavior, transient response, and UVLO behavior. The EVM uses a recommended PCB layout that maximizes thermal performance and minimizes output ripple and noise. 3 Getting Started The host power supply is connected to the EVM at terminal block TB1. The VIN and GND terminals are clearly marked. The terminal block can accept up to number 16 AWG wire. For a complete evaluation, the host supply should be adjustable up to 40 V and be capable of delivering at least 3 A of current. The output of the EVM is presented to terminal block TB2. An electronic or resistive load can be connected to the block. Input and output voltage test points are provided near the terminal blocks. These test points are intended to be used as voltage monitoring points where voltmeters can be connected to measure V IN and VOUT. Do not use these test points as the input supply or output load connection points. The PCB traces connecting to the test points are not designed to support high currents. Before applying power, make certain that the V OUT SELECT (J3) jumper is present and properly positioned for the intended output voltage. Always remove power before changing the jumper settings. Once the jumper setting has been confirmed, set the host input supply to a voltage level between 4.5 V to 40 V, making sure that the sum of V IN + |VOUT| does not exceed 50 V. See Table 1 for the maximum input voltages for the four preset V OUT settings. Turn the host supply ON and then confirm that the selected output voltage is obtained. Table 1. Output Voltage Settings and Maximum V IN V OUT SELECT , J3 (V) MAXIMUM V IN (V) -3.3 40 -5 40 -12 38 -15 35 1 SNVU297 – JULY 2013 Using the LMZ34002: Negative Output Voltage Simple Switcher® Power Module Evaluation Module Submit Documentation Feedback Copyright © 2013, Texas Instruments Incorporated |
Nº de peça semelhante - LMZ34002_14 |
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Descrição semelhante - LMZ34002_14 |
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