Datasheet > CRCW08051K10FKEA

CRCW08051K10FKEA

更新时间： 2024-11-04 06:48:51

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LMZ1050xEXT Evaluation Board

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CRCW08051K10FKEA 数据手册

National Semiconductor

Application Note 2074

Yang Zhang

LMZ1050xEXT Evaluation

Board

August 16, 2010

Introduction

Evaluation Board Design Concept

The LMZ1050xEXT SIMPLE SWITCHER® power module is

a complete, easy-to-use DC-DC solution capable of driving

up to 3A, 4A, or 5A load with exceptional power conversion

efficiency, output voltage accuracy, line and load regulation.

The LMZ1050xEXT is available in an innovative package that

enhances thermal performance and allows for hand or ma-

chine soldering.

The evaluation board is designed to demonstrate low con-

ducted noise on the input and output lines, as seen in Figure

11 and Figure 14. Four input capacitors (C_in1- C _in4) and three

output capacitors (C_o1- C_o3) are populated for this purpose.

All the input and output filter capacitors are not necessary to

comply with radiation standards. For a circuit example that

passes radiated emissions standards (EN55022, class B)

please refer to Figure 19. Additionally, C_in5is present to re-

duce the resonance of the input line produced by the induc-

tance and resistance in the cables connecting the bench

power supply to the evaluation board and the input capacitors.

The LMZ1050xEXT can accept an input voltage rail between

2.95V and 5.5V and deliver an adjustable and highly accurate

output voltage as low as 0.8V. One megahertz fixed frequen-

cy PWM switching provides a predictable EMI characteristic.

Two external compensation components can be adjusted to

set the fastest response time, while allowing the option to use

ceramic and/or electrolytic output capacitors. Externally pro-

grammable soft-start capacitor facilitates controlled startup.

The LMZ1050xEXT is a reliable and robust solution with the

following features: lossless cycle-by-cycle peak current limit

to protect for over current or short-circuit fault, thermal shut-

down, input under-voltage lock-out, and pre-biased startup.

Additional Component Footprints

When the tracking feature of the LMZ1050xEXT is used, re-

move the soft-start capacitor C_SSand use a resistor divider

on designators R_trkband R_trkt. The ground and V_trkpost have

been provided for easy connection.

The LMZ1050xEXT eval board incorporates a precision en-

able circuit which is pulled high by a 100 kΩ pull up resistor

to VIN. This allows the user to pull low on the enable pin to

ground. The top enable resistor is R_entand the bottom enable

resistor is R_enb. Refer to the Design Guideline and Operating

Description section of the LMZ1050xEXT data sheet for de-

tailed design implementation.

Board Specifications

•

V_IN= 2.95V to 5.5V

V_OUT= 2.5V (default output voltage setting, refer to Table

2 for other output settings)

Select FPGAs specify input inrush currents for particular pow-

er-up sequences and others require sequencing rails to avoid

start-up or latch-up problems. To prevent early turn-on of the

LMZ1050xEXT in systems with multiple power rails, precision

enable and tracking are useful as the main input voltage rail

rises at power-up.

•

±2.5% feedback voltage accuracy at 2.5V output

(Including line and load regulation from T_J= -55°C to

125°C)

±1.63% feedback voltage accuracy over temperature

I_OUT= 0A to 3A, 4A, and 5A

•

_JA= 20°C/W, θ_JC= 1.9°C/W

Designed on four layers, the top and bottom layers are

1oz. copper and the two inner layers are 1/2 oz. copper

weight

•

Measures 2.25 in. x 2.25 in. (5.8 cm x 5.8 cm) and is 62mil

(.062”) thick on a FR4 laminate

301280

www.national.com

12 3 4 5 6 7...12

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与CRCW08051K10FKEA相关器件

型号	品牌	获取价格	描述	数据表
CRCW08051K10FKEAC	VISHAY	获取价格	RES 1.1K OHM 1% 1/8W 0805
CRCW08051K10FKEAHP	VISHAY	获取价格	Fixed Resistor, Metal Glaze/thick Film, 0.5W, 1100ohm, 150V, 1% +/-Tol, 100ppm/Cel, Surfac
CRCW08051K10FKEB	VISHAY	获取价格	RES SMD 1.1K OHM 1% 1/8W 0805
CRCW08051K10FKEBC	VISHAY	获取价格	RES 1.1K OHM 1% 1/8W 0805
CRCW08051K10FKTA	VISHAY	获取价格	RES SMD 1.1K OHM 1% 1/8W 0805
CRCW08051K10FKTB	VISHAY	获取价格	RES SMD 1.1K OHM 1% 1/8W 0805
CRCW08051K10FKTC	VISHAY	获取价格	RES SMD 1.1K OHM 1% 1/8W 0805
CRCW08051K10JNEA	VISHAY	获取价格	RES SMD 1.1K OHM 5% 1/8W 0805
CRCW08051K10JNEAC	VISHAY	获取价格	RES 1.1K OHM 5% 1/8W 0805
CRCW08051K10JNEAHP	VISHAY	获取价格	RES SMD 1.1K OHM 5% 1/2W 0805

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