Special Feature: Digital Power supply

Digital Power Management ICs: MD67xx Series Application Examples

The MD67xx series will offer remarkable effects in a variety of power supply applications.
This section introduces our 3 applications as a specific example.

• 2-stage Off-line Converter (Bridgeless PFC + Self-startup LLC)
• 2-stage Off-line Converter (Bridgeless PFC + Current Mode LLC)
• Bridgeless Totem-pole PFC

2-stage Off-line Converter (Bridgeless PFC + Self-startup LLC)

This demo board using the MD6751 is a compact, high-efficiency, and self-starting off-line converter.
Demo Board Features and Specifications

• Bridgeless PFC+LLC with full-digital control
• Built-in startup circuit that requires no external power supply circuit
• Noise reduction by frequency modulation CCM-PFC
• Optimal PFC control that allows higher efficiency and downsized heat-dissipating components
• Period of prototyping a power supply shortened by 30% with the development tool GUI

2-stage Off-line Converter (Bridgeless PFC + Current Mode LLC)

This demo board using the MD6751 is an off-line converter which is compact, high-efficiency, and excellent in responsiveness to input/output voltage variations.

Bridgeless Totem-pole PFC

This demo board using the MD6753 is a PFC suitable for high power supplies whose efficiency requirements are stricter.

Demo Board Features and Specifications

• Compact and high-efficiency totem-pole PFC with optimal control
• Interleaved operation for smaller size and higher efficiency
• Quasi-resonant operation for higher efficiency and lower noise
• Intermittent operation for higher performance in light-load ranges
• Number of parts used for phase compensation reduced by digital control

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