CM6901
SLS (SRC/LLC+SR) Controller with 1 FM+2 PWMs
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.
FEATURES
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.
FM + 2 PWMING Mode Operation
Light Load PWMING (light load regulation)
SR Ideal Diode PWMING(cross resonant frequency
application )
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
DC-DC power supply.
Operates in FM/PWM mode.
CM6901 Pin Configuration
2009/11/02 Rev1.4
Champion Microelectronic Corporation
Page 1
CHAMP [ CHAMPION MICROELECTRONIC CORP. ]
