MM3665

For AC-DC control ICs, MinebeaMitsumi offers primary side control ICs that support PWM + QR combined control, and secondary side synchronous rectification control ICs that can dynamically change the timing off. The MM3665 has a built-in external regulator that is necessary for the circuit configuration, and by performing fixed frequency PWM control during heavy loads and bottoms ticket pseudo-resonance control during medium / light loads, it is optimal for the characteristics of each load region. This ensures optimum control. The MM3665 is the current mode flyback PWM control IC developed for quick charge adapters such as USB-PD. The change in the auxiliary winding voltage of the transformer due to the change in the VBUS voltage of the USB-PD adapter is absorbed by the built-in regulator, and the power supply voltage is held constant. This doesn't require an external voltage regulator circuit. In addition, you can correct and adjust the change of over current protective operation load current due to change of VBUS voltage by external resistor. The IC can substantially reduce standby power by the start up circuit using the 740V high breakdown process and optimization of supply current. It operates PWM fixed frequency at heavy load, it operates bottom turn on by quasi resonant and the frequency is reduced by bottom skip at middle to light loads that minimizes power loss for each load condition and improves average efficiency. Others, frequency jittering function, X capacitor discharge function make the measures of EMI easy. The IC which has various protection functions can assist safety design of power supply.

MM3665 features :

• The primary side control IC suitable for variable output voltage power supplies such as USB-PD compatible AC adapters and printer power supplies
• 740V high breakdown voltage startup circuit reduces standby power
• No external regulator required due to built-in 140V breakdown voltage regulator
• Hybrid operation of fixed frequency and quasi-resonance achieves higher average efficiency and smaller transformer
• Built-in flexible over voltage protection function corresponded to output voltage
• Built-in over current protection function with flat characteristics regardless of AC input voltage
• The over current protection according to output voltage can be set by an external resistor
• Noise diffusion, downsize filter by frequency jitter function in all range
• X capacitor discharge function which don't increase standby power can make the measures of EMI easy
• Built-in AC input voltage brown-out function
• Built-in various protection functions and over temperature protection function
• HV pin input voltage : 600V (absolute max. 740V)
• AUXR pin Input voltage : 10V to 90V (absolute max. 140V)
• Brown-in/out voltage : typ. 72VAC/61VAC
• VDD clamped output voltage : typ. 12V
• Operating current : typ. 0.75mA in latch 0.2mA
• Maximum frequency : typ. 66kHz
• Package SOP-10A

MM3665 applications :

• USB-PD adaptor
• Quick charge adaptor
• The variable output voltage power supply such as printer power supply