The MAX5070BASA+ is a high performance, single ended, current mode PWM controller in 8 pin NSOIC package. This BiCMOS, current mode PWM controller has all the features required for wide input voltage range isolated/nonisolated power supplies. This controller is used for low and high power universal input voltage and telecom power supplies. It contains a fast comparator with only 60ns typical delay from current sense to output for overcurrent protection. It has an integrated error amplifier with the output at COMP. Soft-start is achieved by controlling the COMP voltage rise using external components. Frequency is adjustable from 20KHz to 1MHz with an external resistor and capacitor. The timing capacitor discharge current is trimmed allowing for programmable dead time and maximum duty cycle for a given frequency. The available saw-toothed waveform at RTCT can be used for slope compensation when needed. It is used in universal input AC/DC power supplies.
FB input voltage range from 2.465V to 2.535V, maximum voltage stability of 0.5% at 12V < VCC < 25V
Operating temperature range from -40°C to 125°C
Output voltage range from 4.95V to 5.05V, maximum initial accuracy of 57KHz at TA = +25°C
Pin-for-pin replacement for UC2844
2A drive source and 1A sink capability
Up to 1MHz switching frequency
Trimmed oscillator capacitor discharge current sets maximum duty cycle accurately
Accurate 5% start and stop voltage with 6V hysteresis
(EN)
