电流模式PWM控制器 DIODES AZ3842 TL3842

General Description
The AZ3842/3/4/5 are high performance fixed frequency current-mode PWM controller series.
These integrated circuits are optimized for off-line andDC-DC converter applications with minimum external components. They feature under-voltage lockout(UVLO) circuit for low start-up current, trimmed oscillator for precise duty cycle control, current sense comparator providing maximum current limiting and a totem pole output stage for increasing output current.
In addition, these ICs also feature accurate protection against over-temperature, over-current and maximal output power.
The AZ3842 and AZ3844 have UVLO thresholds of 15.5V(on) and 10V(off); The corresponding thresholds for AZ3843 and AZ3845 are 8.4 V(on) and 7.8V(off).
The AZ3842 and AZ3843 can operate approaching 100% duty cycle; AZ3844 and AZ3845 can operate from zero to 50% duty cycle.
These ICs are available in 3 packages: SOIC-8, DIP-8and SOIC-14.

Features
· Robust VREF Line/Load Regulation
Low Line Regulation : 4mV
Low Load Regulation : 4mV
· High Stability of Reference Voltage over a Full Temperature Range: 0.2mV/ oC
· Operating Frequency up to 500KHz
· High PWM Frequency Stability over a Full Temperature Range: 2.5%
· High PWM Frequency Stability under a Full Supply Voltage Range: 0.2%
· Accurate Over-temperature Protection with Hysteresis
· UVLO with Hysteresis

Applications
· Off-line Converter
· DC-DC Converter
· Voltage Adapter
· CRT Monitor Power Supply
· Desktop Power Supply
· DVD/STB Power Supply

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