描述 Description

The TC170 brings low-power CMOS technology to the current-mode-switching power supply controller market.Maximum supply current is 3.8 mA.Bipolar current-mode control integrated circuits require five times more operating current.The dual totem-pole CMOS outputs drive power MOSFETs or bipolar transistors.The 50nsec typical output rise and fall times (1000pF capacitive loads)minimize MOSFET power dissipation.Output peak current is 300mA.The TC170 contains a full array of system-protection circuits (see features).Current-mode control lets users parallel power supply modules.Two or more TC170 controllers can be slaved together for parallel operation.Circuits can operate from a master TC170 internal oscillator or an external system oscillator.The TC170 operates from an 8V to 16V power supply.An internal 2%,5.1V reference minimizes external component count.The TC170 is pin compatible with the Unitrode UC1846/2846/3846 bipolar controller.Other advantages inherent in current-mode control include superior line and load regulation and automatic symmetry correction in push-pull converters.

特性 Features

Low Supply Current With CMOS Technology..........................3.8mA MaxInternal Reference .........................5.1VFast Rise/Fall Times (CL = 1000pF) ......50nsecDual Push-Pull OutputsDirect-Power MOSFET DriveHigh Totem-Pole Output Drive ............300mADifferential Current-Sense AmplifierProgrammable Current LimitSoft-Start OperationDouble-Pulse SuppressionUndervoltage LockoutWide Supply Voltage Operation ...........8V to 16VHigh Frequency Operation ................ 200kHzAvailable with Low OFF State OutputsLow Power, Pin-Compatible Replacement for UC3846