Datasheet > LMZ22005

LMZ22005

更新时间： 2024-09-14 11:37:47

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美国国家半导体 - NSC		/
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Evaluation Board to be an easy-to-use platform to evaluate

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LMZ22005 数据手册

National Semiconductor

Application Note 2085

Alan Martin

LMZ23605/03, LMZ22005/03

Evaluation Board

March 27, 2011

Introduction

Board Specifications

The LMZ23605/03, LMZ22005/03 evaluation boards are de-

signed to be an easy-to-use platform to evaluate the full

capabilities of this family of SIMPLE SWITCHER® power

modules. The PCB construction has excellent thermal per-

formance and includes extra locations for optional compo-

nents that may not be required in the end application.

•

V_IN= 6V to 36V (LMZ22005/03 limited to 20V)

Enable UVLO = 5.7V

V_OUT= 3.3V

I_OUT= 0 to 5A (LMZ23603 and LMZ22003 limited to 3A)

_JA= 12°C / W, θ_JC= 1.9°C/W

PCB designed on four layers; Inner are 2 oz; Outer are 3

oz.

The LMZ23605/03 can accept an input voltage rail between

6V and 36V and the LMZ22005/03 can accept an input volt-

age rail between 6V 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 architecture is constant fre-

quency PWM with emulated current mode sensing. The con-

trol loop operates well with low ESR output capacitors such

as ceramics or specialty polymer. The precision enable input

allows for programmable UVLO on the input supply or flexi-

bility in sequencing. The external soft-start capacitor facili-

tates controlled output rise time at startup. The module family

is a reliable and robust solution with cycle-by-cycle valley cur-

rent limit to protect for over current or short-circuit faults.

Additionally there is thermal shutdown protection, and they

will start up into a pre-biased output. The free-running switch-

ing frequency is 812 kHz (typ) and a 650 kHz to 950 kHz

synchronization range is supported.

•

Measures 3.5 in. x 3.5 in. (8.9 cm x 8.9 cm) and is 62mil

(.062”) thick of FR4 laminate material

Max ambient temp of 70°C at full 5A load (12 Vin)

For additional circuit considerations refer to the Applications

Section of the LMZ23605/03 or LMZ22005/03 data sheets.

For negative output voltage connections follow the method

shown in AN-2027.

30131601

FIGURE 1. Evaluation Board Simplified Schematic

301316

www.national.com

12 3 4 5 6 7...10

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