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LMZ34002EVM-001 Folha de dados(PDF) 2 Page - Texas Instruments |
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LMZ34002EVM-001 Folha de dados(HTML) 2 Page - Texas Instruments |
2 / 13 page Test Point Description www.ti.com 4 Test Point Description A number of wire loop test points have been provided as convenient connection points for DVMs or oscilloscope probes to aid in the evaluation of this device. A description of each test point is given in the following text. V IN Input voltage monitoring point. Connect DVM to this point for efficiency measurements. –V OUT Negative output voltage monitoring point. Connect DVM to this point for efficiency, line regulation, and load regulation measurements. J1 (V IN) Connect an oscilloscope probe with a short grounding tip to this pair of holes to measure input ripple voltage. J2 (–V OUT) Connect an oscilloscope probe with a short grounding tip to this pair of holes to measure output ripple voltage and transient response. SS The voltage on the soft-start capacitor can be monitored here. INH / UVLO Ground this terminal to Inhibit power conversion via an on-board level-shifter. When open, the voltage on this pin is the voltage of the UVLO resistor divider network. GND Ground points for meters and oscilloscope probes. PH A via test point for monitoring the Phase pin (Switching Node) of the device with an oscilloscope. This test point can be used to measure the switching frequency of the regulator. Only a x10 oscilloscope probe should be used to monitor this point. The operation of the device can be affected by the stray capacitance of conventional cables or x1 probes. 5 Operation Notes The UVLO threshold of the factory-stock EVM is approximately 4.5 V. The input voltage must be above the UVLO threshold before power conversion begins. The UVLO threshold is set by resistors R6 and R7. See the LMZ34002 datasheet for information on setting the UVLO voltage. When the input voltage rises above the UVLO threshold, power conversion begins and the output voltage will ramp to its final value in approximately 10 ms. If desired, this soft-start interval can be increased by adding capacitance at location C4 on the bottom side of the EVM. This location is not populated on the factory-stock EVM. The switching frequency of the factory-stock EVM is set to 800 kHz (typ) by populating resistor R8 with a 0- Ω resistor. The switching frequency can be changed to 500 kHz by changing R8 to 93.1 kΩ. See the LMZ34002 datasheet for switching frequency limits. The CLK input pin (pin 31) has not been brought out to a test point on the factory-stock EVM. The LMZ34002 is not designed to endure a sustained short circuit on its output. It survives momentary shorts (< 5 seconds), but sustained short circuits may cause permanent damage to the device. The maximum output current is dependent on the input and output voltage. Figure 1 shows the output current limits for four common output voltages over the input voltage range. 2 Using the LMZ34002: Negative Output Voltage Simple Switcher® Power SNVU297 – JULY 2013 Module Evaluation Module Submit Documentation Feedback Copyright © 2013, Texas Instruments Incorporated |
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