PWM Controllers

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LT1241 - High Speed Current Mode Pulse Width Modulators
The LT®1241 series devices are 8-pin, fixed frequency, current mode, pulse width modulators. They are improved plug compatible versions of the industry standard UC1842 series. These devices have both improved speed and lower quiescent current. The LT1241 series is optimized for off-line and DC/DC converter applications.
http://www.linear.com/pc/productDetail.jsp?navId=H0,C1,C1003,C1142,C1137,P1332
A Simple Circuit for Driving Microcontroller Friendly PWM Generators
This technical brief will examine a design which combines the PIC10F206, a 6-pin SOT-23 microcontroller, with the MCP1630.
http://ww1.microchip.com/downloads/en/AppNotes/91085A.pdf
Regulating pulse width modulators
The SG3525A series of pulse width modulator integrated circuits are designed to offer improved performance and lowered external parts count when used in designing all types of switching power supplies. The on-chip + 5.1 V reference is trimmed to ±1 % and the input common-mode range of the error amplifier includes the reference voltage eliminating external resistors. A sync input to the oscillator allows multiple units to be slaved or a single unit to be synchronized to an external system clock. A single resistor between the CT and the discharge terminals provide a wide range of dead time adjustment.
http://www.st.com/stonline/products/literature/ds/4286.pdf
Multi-mode controller for SMPS with PFC front-end
The L6566A is an extremely versatile current-mode primary controller IC specifically designed for high-performance offline flyback converters operated from front-end Power Factor Correction (PFC) stages in applications supposed to comply with EN61000-3-2 or JEITA-MITI regulations.
http://www.st.com/stonline/products/literature/ds/13794.pdf
LT1246 - 1MHz Off-Line Current Mode PWM and DC/DC Converter
The LT®1246/LT1247 are 8-pin, fixed frequency, current mode, pulse width modulators. These devices are designed to be improved plug compatible versions of the industry standard UC1842 PWM circuit. The LT1246/ LT1247 are optimized for off-line and DC/DC converter applications.
http://www.linear.com/pc/productDetail.jsp?navId=H0,C1,C1003,C1142,C1137,P1158