SLVU895B March   2013  – January 2022 LMZ31704 , LMZ31707 , LMZ31710

 

  1.   Trademarks
  2. 1Description
  3. 2Getting Started
  4. 3Test Point Descriptions
  5. 4Operation Notes
  6. 5Performance Data
  7. 6Schematic
  8. 7Bill of Materials
  9. 8PCB Layout
  10. 9Revision History

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 3-1 Test Point Descriptions(1)
Test Point Description
PVIN Input voltage monitor. Connect DVM to this point to measure efficiency.
VOUTOutput voltage monitor. Connect DVM to this point to measure efficiency, line regulation, and load regulation.
AGNDInput 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.
PWRGDMonitors 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-kΩ to 100-kΩ pullup resistor is recommended. PWRGD is high if the output voltage is within 92% to 107% of its nominal value.
INH/UVLOConnect 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/CLKConnects 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/TRConnects 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 to track applications.
SYNC_OUTThis output provides a clock signal that is 180° out of phase with the PH node of the device and can be used to synchronize other devices.
AGNDControl 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 data sheets for absolute maximum ratings associated with these features.