Resonant Controller- CM6901
General Description

CM6901 is a SLS, SRC/LLC + SR resonant controller  and it can operate at both SRC and LLC region with synchronous rectification to achieve high efficiency. Its unique features: FM + 2 PWMING modes.  It is used for DC-DC conversion in offline application.  Light load regulation is accomplished by transitioning the controller from frequency modulation mode into PWM mode. To have the optimal balance performance between hold-up time and efficiency, its frequency range crosses fr1, resonant frequency.

 CM6901 system has a constant voltage feedback loop with precision 2.5V Vfb reference. The 1V ILIMIT can be latched when a standby converter is applied; otherwise, it is an auto-restart I limit.


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Features

  • Inrush Current Control
  • Separated PFC OVP pin
  • Separated Power VCC and Analog VCC
  • Separated Power Ground and Analog Ground
  • Additional folded-back current limit for PWM section.
  • 23V Bi-CMOS process
  • VIN OK guaranteed turn on PWM at 2.5V instead of 1.5V
  • Internally synchronized leading edge PFC and trailing edge PWM in one IC
  • Slew rate enhanced transconductance error amplifier for ultra-fast PFC response
  • Low start-up current (100μA typ.)
  • Low operating current (3.0mA type.)
  • Low total harmonic distortion, high PF
  • Reduces ripple current in the storage capacitor between the PFC and PWM sections
  • Average current, continuous or discontinuous boost leading edge PFC
  • VCC OVP Comparator
  • Low Power Detect Comparatoru PWM configurable for current mode or voltage mode operation
  • Current fed gain modulator for improved noise immunity
  • Brown-out control, over-voltage protection, UVLO, and soft start, and Reference OK

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Applications

u          DC-DC power supply.

u          Operates in FM/PWM mode.

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Packages

  • 16-Pin PDIP
  • 16-Pin SOP
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6901    Datasheet PDF file

6901 T2Datasheet PDF file

6901 T6Datasheet PDF file




 
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