Datasheet > UMK316B7105KL-T

UMK316B7105KL-T

更新时间： 2024-11-04 05:55:15

品牌	Logo	应用领域
美国国家半导体 - NSC		/
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LMZ1420xEXT/ LMZ1200xEXT Evaluation Board

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UMK316B7105KL-T 数据手册

National Semiconductor

Application Note 2084

Alan Martin

LMZ1420xEXT /

LMZ1200xEXT Evaluation

Board

August 16, 2010

Introduction

Board Specifications

The LMZ1420xEXT and LMZ1200xEXT SIMPLE SWITCH-

ER® power modules are easy-to-use DC-DC solution capa-

ble of driving up to a 3A load with exceptional power

conversion efficiency, output voltage accuracy, line and load

regulation. They are available in an innovative package that

enhances thermal performance and allows for hand or ma-

chine soldering.

•

LMZ1420xEXT V_IN= 6V to 42V

LMZ1420xEXT enable UVLO = 8V

LMZ1420xEXT V_OUT= 3.3V

LMZ1200xEXT V_IN= 4.5V to 20V

LMZ1200xEXT enable UVLO = 4.5V

LMZ1200xEXT V_OUT= 1.8V

Operates at full load up to 80°C ambient at 12V input

The LMZ14203EXT/2EXT/1EXT can accept an input voltage

rail between 6V and 42V and the LMZ12003EXT/2EXT/1EXT

can accept an input voltage rail between 4.5V and 20V. The

devices can deliver an adjustable and highly accurate output

voltage as low as 0.8V and as high as 6V. The control struc-

ture is constant on-time with input voltage feed forward. This

creates a nearly constant switching frequency across the in-

put voltage range. The control loop operates well with low

ESR output capacitors such as ceramics. An output feed-for-

ward capacitor across the upper feedback resistor trims for

optimum transient response. The precision enable input al-

lows for programmable UVLO of the input supply. The exter-

nal soft-start capacitor facilitates controlled startup output rise

time. The LMZ1420xEXT and LMZ1200xEXT family is a reli-

able and robust solution with the following features: lossless

cycle-by-cycle valley current limit to protect for over current

or short-circuit fault, thermal shutdown, input under-voltage

lock-out, and will start up into a pre-biased output. The

LMZ1420xEXT and LMZ1200xEXT families are shock and

vibration certified and rated for operation down to –55°C.

_JA= 20°C / W, θ_JC= 1.9°C / W

Designed on four layers, all four layers are 1 oz. copper

weight

•

The two internal ground planes are identical

Measures 1.705 in. x 3.03 in. (4.33 cm x 7.7cm) and is

62mil (.062”) thick of FR4 laminate material

For additional circuit modifications refer to the Design Con-

sideration section of the LMZ1420xEXT or LMZ1200xEXT

data sheet. For negative output voltage connections see

AN-2027.

Additional Footprints

Additional component mounting pads are available to exper-

iment with alternative Cin and Cout combinations or a zener

clamp on the enable input. See Figure 6 for corresponding

schematic locations.

30131501

FIGURE 1. Evaluation Board Schematic

(LMZ1200xEXT 1.8V application values shown in parentheses)

301315

www.national.com

12 3 4 5 6 7...10

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