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the unitrode (currently TI) has several current mode chips, among them UC384X are the most famous and also oldest products.
for proper selection of the chip (V power on and duty cycle) see the data sheet.
Another famous and versalite Switching Regulator IC is National Semiconductor LM1578A / LM2578A / LM3578A.
It may be operated in either the continuous or the discontinuous conduction mode.
It can be used as either Flyback-, Inverting-, Step-Up- or Step-Down converter.
**broken link removed**
The LM1578A is a pulse-width modulator designed for use
as a switching regulator controller. It may also be used in
other applications which require controlled pulse-width voltage