4.1 Open Loop (PWM+COG) Mode

This configuration enables the digital PWM module and complementary output control with dead times. The PWM outputs of PIC16F1779 produce a fixed switching frequency of 500 kHz with a fixed duty ratio of ~20%. The signal is fed to the rising and falling source of the Complementary Output Generator (COG) which produces the complementary PWM signals for driving the high-side and low-side switches. The Open Loop mode is very useful during the hardware validation of the power converters to analyze operation and signal integrity under stable conditions. The figure below shows the block diagram of the open loop configuration.