产品说明The MC34167, MC33167 series are high performance fixed frequency power switching regulators that contain the primary functions required for dc-to-dc converters. This series was specifically designed to be incorporated in step-down and voltage-inverting configurations with a minimum number of external components.These devices consist of an internal temperature compensated reference, fixed frequency oscillator with on-chip timing components, latching pulse width modulator for single pulse metering, high gain error amplifier, and a high current output switch.Protective features consist of cycle-by-cycle current limiting, undervoltage lockout, and thermal shutdown. Also included is a low power standby mode that reduces power supply current to 36 µA.特性  Output Switch Current in Excess of 5.0 AFixed Frequency Oscillator (72 kHz) with On-Chip TimingProvides 5.05 V Output without External Resistor DividerPrecision 2% Reference0% to 95% Output Duty CycleCycle-by-Cycle Current LimitingUndervoltage Lockout with HysteresisInternal Thermal ShutdownOperation from 7.5 V to 40 VStandby Mode Reduces Power Supply Current to 36 µAEconomical 5-Lead TO-220 Package with Two Optional LeadformsAlso Available in Surface Mount D2PAK PackageMoisture Sensitivity Level (MSL) Equals 1Pb-Free Packages are Available应用Digital TV (LCD, PDP)Efficient system pre-regulator for linear voltage regulatorsBattery chargers