SNVU570B December   2017  – February 2022 TPSM846C24

 

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

Test Point Descriptions

Wire-loop test points and scope probe test points are provided as convenient connection points for digital voltmeters (DVM) or oscilloscope probes to aid in the evaluation of the device. Table 3-1 provides a description of each test point:

Table 3-1 Test Points
Test PointDescription
VINInput voltage monitor. Connect DVM to this point for measuring efficiency.
VS+Supply path output voltage monitor. Connect DVM positive lead to this point for line regulation and load regulation.
VS–Return path output voltage monitor. Connect DVM negative lead to this point for measuring line regulation and load regulation.
VOUTOutput voltage monitor. Connect DVM to this point and PGND for measuring efficiency.
PGNDInput and output voltage monitor grounds. Reference the VIN and VOUT DVMs to these ground points.
VIN MON (J1)Input voltage scope monitor. Connect an oscilloscope to this set of points to measure input ripple voltage.
VOUT MON (J2)Output voltage scope monitor. Connect an oscilloscope to this set of points to measure output ripple voltage and transient response.
AGNDAnalog ground point. Use any of the AGND test points as the ground reference for the control signals.
ENEN pin. Pull to AGND to stop power conversion. Float or pull to 3.3 V to enable power conversion. An internal 10-kΩ pullup resistor to 3.3 V is present on the EVM.
EXT CLKExternal clock input. This is the input to a D flip-flop. Apply an external clock at a frequency that is twice the required switching frequency. Remove R13 before applying the clock signal.
SYNCSYNC monitor pin. This pin is the output of a D flip-flop which supplies a clock to both devices.
PGOODMonitors the power good signal of the device. This is an open-drain signal that has an on-board 10-kΩ pullup resistor to 3.3 V.
DIFFOOutput of remote sense differential amplifier
SignalSignal injection point for the Bode plot analyzer. Inject from Signal to CHB.
CHAInput signal monitoring point for the Bode plot analyzer
CHBOutput signal monitoring point for the Bode plot analyzer
PH1Switch node of the TPSM846C24 controller device (U1). Use an unshielded scope probe to monitor this point.
PH2Switch node of the TPSM846C24 target device (U2). Use an unshielded scope probe to monitor this point.
Note:

Refer to TPSM846C24 4.5-V to 15-V Input, 0.5-V to 2.0-V Output, 35-A Power Module Data Sheet for absolute maximum ratings associated with features in Table 3-1.