CM6901
SLS (SRC/LLC+SR) Controller with 1 FM+2 PWMs
GENERAL DESCRIPTION
FEATURES
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.
90+ Controller
Smaller and Thinner Transformer
20ms with reasonable Bulk Cap(hold up time)
SLS, SRC/LLC + SR resonant controller
Supply Voltage Range : 10V to 20V.
2 Gate Drivers: Typical Peak Drive from 12V
supply : (PMOS~200 ohm and NMOS~100 ohm).
UVLO =11V with 1V Hystetesis.
Reference OK Comparator.
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).
FM + 2 PWMING Mode Operation
Light Load PWMING (light load regulation)
SR Ideal Diode PWMING(cross resonant frequency
application )
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.
GM FEAO, FM modulation Error Amplifier
GM DEAO, PWM Error Amplifier
Close Loop Soft start Capability with Shutdown
Function.
Auto-Restart during Current Limit .
Precision 2.5V VFB threshold for constant voltage
feedback loop.
Precision 1V I limit threshold.
APPLICATIONS
CM6901 Pin Configuration
DC-DC power supply.
Operates in FM/PWM mode.
2009/11/02 Rev1.4
Champion Microelectronic Corporation
Page 1
CHAMP [ CHAMPION MICROELECTRONIC CORP. ]
