4.1.2 Open Loop Test

Below are the steps for testing the Open Loop operation of the CIP Hybrid Power Starter Kit.

  1. Remove programming interface. Place CH1 oscilloscope probe to PWM_HS test point, CH2 oscilloscope probe to PWM_LS test point, CH3 oscilloscope probe to CT_CS test point, and CH4 oscilloscope probe to VOUT test point.
  2. Connect DC supply (set to 9V) and LOAD (set to 2A). Power-up the board. PWM_HS, PWM_LS and CT_CS signals and VOUT can be monitored.
  3. Increasing VIN will increase VOUT following the equation VOUT = [duty ratio] * VIN.
Figure 4-11. PWM_HS, PWM_LS and CT_CS Signals and VOUT Measurement