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LMZ31704 データシート(PDF) 3 Page - Texas Instruments |
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LMZ31704 データシート(HTML) 3 Page - Texas Instruments |
3 / 12 page www.ti.com Test Point Descriptions The Controls test points located directly below the device are made available to test the features of the device. Any external connections made to these test points should be referenced to the Control Ground test point located along the bottom of the EVM. Refer to the Test Points Descriptions section of this guide for more information on the individual control test points. The Vout Select jumper (P3) and Fsw Select jumper (P2) are provided for selecting the desired output voltage and appropriate switching frequency. Before applying power to the EVM, ensure that the jumpers are present and properly positioned for the intended output voltage. Refer to Table 1 for the recommended jumper settings. Always remove input power before changing the jumper settings. Once the jumper settings have been confirmed, configure the host input supply to apply the appropriate bus voltage listed in Table 1 and confirm that the selected output voltage is obtained. Table 1. Output Voltage and Switching Frequency Jumper Settings Vout Select Fsw Select PVin Bus Voltage 5.0 V 1 MHz 12 V 3.3 V 750 kHz 5 V or 12 V 2.5 V 750 kHz 5 V or 12 V 1.8 V 500 kHz 5 V or 12 V 1.2 V 300 kHz 5 V or 12 V 0.9 V 250 kHz 5 V or 12 V 0.6 V 200 kHz 5 V or 12 V 3 Test Point Descriptions Twelve wire-loop test points and two scope probe test points have been provided as convenient connection points for digital voltmeters (DVM) or oscilloscope probes to aid in the evaluation of the device. A description of each test point follows: Table 2. Test Point Descriptions (1) PVIN Input voltage monitor. Connect DVM to this point for measuring efficiency. VOUT Output voltage monitor. Connect DVM to this point for measuring efficiency, line regulation, and load regulation. AGND Input and output voltage monitor grounds (located between terminal blocks). Reference the above DVMs to any of these four analog ground points. PVIN Scope (J1) Input voltage scope monitor. Connect an oscilloscope to this set of points to measure input ripple voltage. VOUT Scope (J2) Output voltage scope monitor. Connect an oscilloscope to this set of points to measure output ripple voltage and transient response. PWRGD Monitors the power good signal of the device. This is an open drain signal that requires an external pullup resistor if monitoring is desired. A 10-k Ω to 100-kΩ pullup resistor is recommended. PWRGD is high if the output voltage is within 92% to 107% of its nominal value. INH/UVLO Connect this point to control ground to inhibit the device. Allow this point to float to enable the device. An external resistor divider can be connected between this point, control ground, and Vin to adjust the UVLO of the device. RT/CLK Connects to the RT/CLK pin of the device. An external clock signal can be applied to this point to synchronize the device to an appropriate frequency. SS/TR Connects to the internal slow-start capacitor of the device. An external capacitor can be connected from this point to control ground to increase the slow-start time of the device. This point can also be used as for tracking applications. SYNC_OUT This output provides a clock signal that is 180º out of phase with the PH node of the device and can be used to synchronize other devices. AGND Control ground (located along bottom of EVM). Reference any signals associated with the control test points to this analog ground point. (1) Refer to the LMZ317xx datasheet for absolute maximum ratings associated with above features. 3 SLVU895A – March 2013 – Revised June 2013 LMZ31710, LMZ31707 and LMZ31704 Simple Switcher® Power Module Evaluation Module Submit Documentation Feedback Copyright © 2013, Texas Instruments Incorporated |
同様の部品番号 - LMZ31704 |
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同様の説明 - LMZ31704 |
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