SLVUA04A February   2014  – January 2022 LMZ31704 , LMZ31707 , LMZ31710

 

  1. 1 Description
  2. 2 Getting Started
  3. 3 Test Point Descriptions
  4. 4 Operation Notes
  5. 5 Current Limitations
  6. 6 Performance Data
  7. 7 2× Parallel Bill of Material
  8. 8 2× Parallel Schematic
  9. 9 4× Parallel Bill of Material
  10. 104× Parallel Schematic
  11. 11Revision History

3 Test Point Descriptions

Wire-loop test points and 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 test board. Table 3-1 provides a description of each test point.

Table 3-1 Test Point Descriptions
Test Point Description
AGND Control and monitor grounds. Reference the DVMs and any signals associated with the control test points to any of the analog ground points.
CLK_IN Connects to the RT/CLK pin of the LMZ31710 devices. An external clock signal can be applied to this point to synchronize the devices to an appropriate frequency.
INH/UVLO Connect this point to control ground to inhibit the LMZ31710 devices. Allow this point to float to enable the device. An external resistor divider (R3 and R4) can be connected between this point, control ground, and PVIN to adjust the undervoltage lockout of the device.
PVIN Input voltage monitor. Connect the DVM to this point to measure efficiency.
PVIN Scope (P2) Input voltage scope monitor. Connect an oscilloscope to this set of points to measure input ripple voltage.
PWRGD Monitors the power good signal of the LMZ31710. This is an open-drain signal that requires an external pullup resistor if monitoring is desired. TI recommends a 10-kΩ to 100-kΩ pullup resistor.
PWRGD PULL_UP Power-good pullup voltage connection point. Connect an external voltage (< 6 V) to this pin to supply a voltage for the PWRGD signal. A 100-kΩ pullup resistor is located on the bottom-side of the board.
SS/TR Connects to the slow-start connection of the LMZ31710 devices. An external capacitor can be connected from this point to control ground to increase the slow-start time of the devices. This point can also be used as an input for tracking applications.
SYNC_OUT This output provides a clock signal that is 180° out of phase with the PH node of the LMZ31710 device and can be used to synchronize other devices.
VOUT Output voltage monitor. Connect DVM to this point for measuring efficiency, line regulation, and load regulation.
VOUT Scope (P3) Output voltage scope monitor. Connect an oscilloscope to this set of points to measure output ripple voltage and transient response.