LM5027ASQX/NOPB

Frequency - Switching:	310kHz
Base Part Number:	LM5027
Supplier Device Package:	24-WQFN (4x5)
Package / Case:	24-WFQFN Exposed Pad
Operating Temperature:	-40°C ~ 125°C (TJ)
Control Features:	Frequency Control, Ramp, Soft Start
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	No
Duty Cycle (Max):	72.5%
Series:	--
Voltage - Supply (Vcc/Vdd):	13 V ~ 90 V
Output Phases:	1
Number of Outputs:	3
Topology:	Forward Converter
Output Configuration:	Positive, Isolation Capable
Function:	Step-Up/Step-Down
Output Type:	Transistor Driver
Part Status:	Last Time Buy
Packaging:	Tape & Reel (TR)

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Introduction

The LM5027ASQX/NOPB is a high-efficiency, DC/DC Switching Controller designed by Texas Instruments. It is a member of the LM5027 high-voltage synchronous buck switching controller family. It offers features such as integrated FET driver, two-level current-limit protection, a very small shutdown current and a programmable soft-start (start-up) time. The LM5027ASQX/NOPB is a high-voltage device that supports voltages up to 200V and offers excellent efficiency and high performance.

Application Field

The LM5027ASQX/NOPB is a versatile, efficient, and compact high voltage DC/DC controller suitable for both transformer and capacitor based AC/DC rectification systems. It is ideal for applications requiring high power and low noise performance such as laptop chargers, AC/DC motor drives, power supplies, and telecom rectification systems. It is also suitable for automotive and industrial power systems where reliable and high-efficiency power delivery is necessary.

Working Principle

The LM5027ASQX/NOPB has a two-level over-current protection feature that limits the output current to the specified limit. This feature prevents damage to the device and any connected components from over-current failure. The current sense comparator turns off the P-channel MOSFET switching device upon detection of an over current, thereby preventing the output voltage from going over the specified limit.The internal clock of the LM5027ASQX/NOPB can be controlled via an external resistor for precise switching frequency control. The frequency range can be set to between 0.5 to 5MHz. The frequency of the clock can be set manually, or the frequency can be programmed using an external RC network.The LM5027ASQX/NOPB has an integrated FET driver stage, which helps in increasing the efficiency and power transfer. It also has a built-in programmable soft-start feature. This feature allows the user to program the start-up duration and start-up current of the switching device. This feature helps to reduce the inrush current during start-up, which can significantly increase the lifespan of the device.The LM5027ASQX/NOPB also features a high-efficiency mode switch, which is used to reduce the power consumption of the device when in standby mode. In standby mode, the operating frequency is reduced and the current consumption is minimized.The LM5027ASQX/NOPB is a versatile, efficient, and compact high-voltage DC/DC controller with excellent features. It is suitable for applications where reliable and efficient power delivery is necessary. The integrated FET driver and programmable soft-start feature make it an ideal choice for AC/DC rectification systems and other power systems requiring high power and low noise performance.

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