Datasheet > LM5119_1

LM5119_1

更新时间： 2024-09-29 11:36:39

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美国国家半导体 - NSC		/
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描述
Evaluation Board Input Voltage Range: 14V to 55V

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LM5119_1 数据手册

National Semiconductor

Application Note 2065

Eric Lee

LM5119 Evaluation Board

September 28, 2010

choose the correct connector and wire size when attaching

the source power supply and the load.

Introduction

The LM5119EVAL evaluation board provides the design en-

gineer with a fully functional dual output buck converter, em-

ploying the LM5119 Dual Emulated Current Mode Syn-

chronous Buck Controller. The evaluation board is designed

to provide both 10V and 5V outputs over an input range of

14V to 55V. Also the evaluation board can be easily config-

ured for a single 10V, 8A regulator.

SOURCE POWER

The power supply and cabling must present low impedance

to the evaluation board. Insufficient cabling or a high

impedance power supply will droop during power supply ap-

plication with the evaluation board inrush current. If large

enough, this droop will cause a chattering condition during

power up. During power down, insufficient cabling or a high

impedance power supply will overshoot. This overshoot will

cause a non-monotonic decay on the output.

Performance of the Evaluation

Board

An additional external bulk input capacitor may be required

unless the output voltage droop/overshoot of the source pow-

er is less than 0.7V. In this board design, UVLO setting is

conservative while UVLO hysteresis setting is aggressive.

Minimum input voltage can goes down with an aggressive

design. Minimum operating input voltage depends on the out-

put voltage droop/overshoot of the source power supply and

the forced off-time of the LM5119. Refer to the LM5119

datasheet for complete design information.

•

Input Voltage Range: 14V to 55V

Output Voltage: 10V (CH1), 5V (CH2)

Output Current: 4A (CH1), 8A (CH2)

Nominal Switching Frequency: 230 KHz

Synchronous Buck Operation: Yes

Diode Emulation Mode: Yes

Hiccup Mode Overload Protection: Yes

External VCC Sourcing: Yes

When using an electronic load, it is strongly recommended to

power up the evaluation board at light load and then slowly

increase the load. If it is desired to power up the evaluation

board at maximum load, resistor banks must be used. In gen-

eral, electronic loads are best suited for monitoring steady

state waveforms.

Powering and Loading

Consideration

When applying power to the LM5119 evaluation board, cer-

tain precautions need to be followed. A misconnection can

damage the assembly.

AIR FLOW

PROPER BOARD CONNECTION

Prolonged operation with high input voltage at full power will

cause the MOSFETs to overheat. A fan with a minimum of

200LFM should be always provided.

The input connections are made to the J1 (VIN) and J2 (RTN/

GND) connectors. The CH1 load is connected to the J3

(OUT1+) and J4 (OUT1-/GND) and the CH2 load is connect-

ed to the J6 (OUT2+) and J5 (OUT2-/GND). Be sure to

30126006

FIGURE 1. Typical Evaluation Setup

301260

www.national.com

12 3 4 5 6 7...10

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与LM5119_1相关器件

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LM5119PSQX	NSC	获取价格	Wide Input Range Dual Synchronous Buck Controller
LM5119PSQX/NOPB	TI	获取价格	5.5V 至 65V 宽输入电压、电流模式双路同步降压控制器 \| RTV \| 32 \| -
LM5119Q	TI	获取价格	汽车级 5.5V 至 65V 宽输入电压、电流模式双路同步降压控制器
LM5119QPSQ/NOPB	TI	获取价格	汽车级 5.5V 至 65V 宽输入电压、电流模式双路同步降压控制器 \| RTV \| 32
LM5119QPSQX/NOPB	TI	获取价格	汽车级 5.5V 至 65V 宽输入电压、电流模式双路同步降压控制器 \| RTV \| 32
LM5121	TI	获取价格	Wide Input Synchronous Boost Controller with Disconnection Switch Control

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