SNVSB29C October 2018 – June 2021 LM5143-Q1
Each channel of the LM5143-Q1 has an independent high-gain transconductance amplifier that generates an error current proportional to the difference between the feedback voltage and an internal precision reference (0.6 V). The output of the transconductance amplifier is connected to the COMP pin, allowing the user to provide external control loop compensation. A type-II compensation network is generally recommended for peak current-mode control.
The amplifier has two gain settings, one is for normal operation with a gm of 1200 µS and the other is for ultra-low IQ with a gm of 60 µS. For normal operation, connect MODE to AGND. For ultra-low operation, IQ connect MODE to AGND through a 10-kΩ resistor.