LM5085EVAL: 5V @ 4.5A, 5.5 ~ 55V in

Summary

The LM5085EVAL evaluation board provides the design engineer with a fully functional buck regulator, employing the LM5085 PFET switching controller which uses the constant on-time (COT) operating principle. This evaluation board provides a 5V output over an input range of 5.5V to 55V. The circuit delivers load currents to 4.5A, with current limit set at 7.6A.

The board’s specification are:

Input Voltage: 5.5V to 55V, 60V maximum
Maximum load current: 4.5A for VIN >8V
Minimum load current: 0A
Current Limit Threshold: ≊7.6A
Measured Peak Efficiency: 97.2% (VIN = 5.5V, IOUT = 0.6Amps)
Nominal Switching Frequency: 300 kHz
Size: 3.1 in. x 1.5 in. x 0.78 in

Specifications

Manufacturer	Texas Instruments
Category	AC/DC and DC/DC Conversion
Sub-Category	DC/DC SMPS - Single Output
Eval Board Part Number	LM5085EVAL/NOPB-ND
Eval Board Supplier	Texas Instruments
Eval Board	Normally In Stock
Topology	Step Down
Outputs and Type	1 Non-Isolated
Voltage Out: Factory Set	5 V
Current Out	4.5 A
Voltage In	5.5 ~ 55 V
Efficiency @ Conditions	>87%, 24V in, 5V @ 2 ~ 4 A >82%, 55V in, 5V @ 2 ~ 4 A
Voltage Out Range	- Not Given
Features	Current Limit (Adj. or Fixed) Over Current Protection Over Voltage Protection Shutdown, Enable, Standby Soft Start Thermal Protection Under Voltage Protection, Brown-Out
Switching Frequency	300 kHz
Standby Current [Typical]	345 µA
Quiescent Current [Typical]	1.3 mA
Component Count + Extras	20 + 7
Internal Switch	No
Design Author	Texas Instruments
Application / Target Market
Standby Current [Maximum]	200 µA
Quiescent Current [Maximum]	1.8 mA
Main I.C. Base Part	LM5085
Date Created By Author	2008-10
Date Added To Library	2013-02