Datasheet > LM5006

LM5006

更新时间： 2024-11-28 12:20:19

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美国国家半导体 - NSC		/
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Evaluation Board provides the design engineer with a fully functional

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LM5006 数据手册

National Semiconductor

Application Note 2050

Dennis Morgan

LM5006 Evaluation Board

February 22, 2011

•

Input Voltage: 6V to 75V

Output Voltage: 5V

Introduction

The LM5006EVAL evaluation board provides the design en-

gineer with a fully functional buck regulator, employing the

constant on-time (COT) operating principle. This evaluation

board provides a 5V output over an input range of 6V to 75V.

The circuit delivers load currents to 500 mA, with current limit

set at a nominal 1 Amp.

Maximum load current: 500 mA

Minimum load current: 0A

Current Limit: 1 Amp (nominal)

Measured Efficiency: 94.75% (V_IN= 6V, I_OUT= 100 mA)

Nominal Switching Frequency: 200 kHz

Size: 2.6 in. x 1.6 in.

The board’s specification are:

30121101

FIGURE 1. Evaluation Board - Top Side

versely with VIN to maintain a nearly constant switching fre-

Theory of Operation

quency. At the end of each on-time the Minimum Off-Timer

ensures the buck switch is off for at least 260 ns. In normal

operation, the off-time is much longer. During the off-time, the

load current is supplied by the output capacitor (C2). When

the output voltage falls sufficiently that the voltage at FB is

below 2.5V, the regulation comparator initiates a new on-time

period. For stable, fixed frequency operation, a minimum of

25 mV of ripple is required at FB to switch the regulation com-

parator. Refer to the LM5006 data sheet for a more detailed

block diagram, and a complete description of the various

functional blocks.

Refer to the evaluation board schematic in Figure 6. When

the circuit is in regulation, the buck switch is on each cycle for

a time determined by R1 and VIN according to the equation:

The on-time of this evaluation board ranges from ≊4.38 µs at

VIN = 6V, to ≊351 ns at VIN = 75V. The on-time varies in-

301211

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