器件名称: CS2843A
功能描述: Off-Line Current Mode PWM Control Circuit with Undervoltage Lockout
文件大小: 273.88KB 共10页
简 介:CS2842A, CS3842A, CS2843A, CS3843A OffLine Current Mode PWM Control Circuit with Undervoltage Lockout
The CS284XA, CS384XA provides all the necessary features to implement offline fixed frequency currentmode control with a minimum number of external components. The CS384XA family incorporates a new precision temperaturecontrolled oscillator with an internally trimmed discharge current to minimize variations in frequency. A precision dutycycle clamp eliminates the need for an external oscillator when a 50% dutycycle is used. Dutycycles greater than 50% are also possible. On board logic ensures that VREF is stabilized before the output stage is enabled. Ion implant resistors provide tighter control of undervoltage lockout. Other features include low startup current, pulsebypulse current limiting, and a highcurrent totem pole output for driving capacitive loads, such as the gate of power MOSFET. The output is LOW in the off state, consistent with Nchannel devices. The CS384XA series of currentmode control ICs are available in 8 and14 lead packages for surface mount (SO) applications as well as 8 lead PDIP packages. Features Optimized for Offline Control Internally Trimmed Temperature Compensated Oscillator Maximum DutyCycle Clamp VREF Stabilized Before Output Stage is Enabled Low Startup Current PulseByPulse Current Limiting Improved Undervoltage Lockout Double Pulse Suppression 1.0% Trimmed Bandgap Reference High Current Totem Pole Output
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