Linear Technology DC1345 Manuel utilisateur

DEMO CIRCUIT 1345

QUICK START GUIDE

WIDE INPUT VOLTAGE RANGE

NO RSENSE STEP-DOWN DC/DC CONVERTER

LTC3879EMSE

DESCRIPTION

Demonstration circuit 1345 is a wide input voltage

range, no Rsense step-down dc/dc converter featuring

the LTC3879EMSE. Its output voltage is 1.2V with a

load rating of 12A and the input voltage range is 4.5V

to 34V.

The fixed on-time valley current mode architecture of

the LTC3879EMSE provides a very fast load step re-

sponse. Other features of the board include a RUN pin,

a TRACK pin, a PGOOD pin and a MODE jumper to

select either CCM or DCM operation at light load.

Design files for this circuit board are available. Call

the LTC factory.

Table 1. Performance Summary (T

= 25°C)

PARAMETER CONDITION VALUE

Minimum Input Voltage 4.5V

Maximum Input Voltage 34V

Output Voltage V

OUT

= 4.5V to 34V, I

OUT

= 0A to 12A 1.2V ±2%

Maximum Output Current 12A

Typical Output Voltage Ripple V

= 12V, I

OUT

= 12A (20MHz BW) 20mV

P–P

Nominal Switching Frequency V

= 12V, I

OUT

= 12A 300kHz

Efficiency (see Figure 3 for efficiency curves) V

= 12V, I

OUT

= 12A 90% Typical

QUICK START PROCEDURE

Demonstration circuit 1345 is easy to set up to evalu-

ate the performance of the LTC3879EMSE. Refer to

Figure 1 for proper measurement equipment setup and

follow the procedure below:

NOTE:

When measuring the output voltage ripple, care

must be taken to avoid a long ground lead on the oscil-

loscope probe. See Figure 2 for proper scope probe

technique. Short, stiff leads should be soldered to the

(+) and (-) terminals of an output capacitor. The

probe’s ground ring needs to touch the (-) lead and the

probe tip needs to touch the (+) lead.

Place jumpers in the following positions:

RUN ON

MODE CCM

With power off, connect the input power supply to

Vin and GND.

Turn on the power at the input.

Check for the proper output voltages.

Vout = 1.176V to 1.224V

Once the proper output voltages are established,

adjust the loads within the operating range and ob-

serve the output voltage regulation, ripple voltage,

efficiency and other parameters.

DEMO CIRCUIT 1345

QUICK START GUIDE

Vin Load

Iout

Vout

Vin

supply

Iin

Figure 1.

Proper Measurement Equipment Setup

VOUT GND

COUT

Figure 2.

Measuring Output Voltage Ripple

DEMO CIRCUIT 1345

QUICK START GUIDE

Fsw = 300kHz, CCM

0 2 4 6 8 10 12 14

Load current (Amps)

Efficiency

Vin=5V

Vin=12V

Vin=24V

Vin=34V

Parameters:

QT = Infineon BSC093N04LSG

QB = Infineon BSC035N04LSG

L = Wurth 744325072

0.72uH, DCR=1.3mΩ+/- 10%

Ron = 576kΩ

Figure 3.

Typical Efficiency Curves

DEMO CIRCUIT 1345

QUICK START GUIDE

Table des matières

Autres manuels Linear Technology Convertisseur de média

Linear Technology

Linear Technology LTC1628 Manuel utilisateur

Linear Technology

Linear Technology LTC1966 Manuel utilisateur

Linear Technology

Linear Technology LTM8046 Guide de l'utilisateur

Linear Technology

Linear Technology LTC3455EUF-1 Manuel utilisateur

Linear Technology

Linear Technology LTC3129-1 Manuel utilisateur

Linear Technology

Linear Technology DC1228A Guide de configuration rapide

Linear Technology

Linear Technology DC164 Guide de configuration rapide

Linear Technology

Linear Technology DC1516A Manuel utilisateur

Linear Technology

Linear Technology LT1933 Manuel utilisateur

Linear Technology

Linear Technology LTC3725 Manuel utilisateur

Linear Technology

Linear Technology DC2111A-A/B Guide de configuration rapide

Linear Technology

Linear Technology LTC3444 Manuel utilisateur

Linear Technology

Linear Technology Analog Devices LT8301 Manuel utilisateur

Linear Technology

Linear Technology LTC3765 Guide de configuration rapide

Linear Technology

Linear Technology DC2372A Guide de configuration rapide

Linear Technology

Linear Technology DC2490A Guide de configuration rapide

Linear Technology

Linear Technology LTM8057 Guide de configuration rapide

Linear Technology

Linear Technology LT8330 Manuel utilisateur

Linear Technology

Linear Technology LTC3118EUFD Guide de configuration rapide

Linear Technology

Linear Technology DC1745A Guide de configuration rapide

Linear Technology

Linear Technology DC1887A Guide de configuration rapide

Linear Technology

Linear Technology LT1930ES5 Manuel utilisateur

Linear Technology

Linear Technology DC257 Guide de configuration rapide

Linear Technology

Linear Technology LTC3839EUH Guide de configuration rapide

Manuels Convertisseur de média populaires d'autres marques

SoundTraxx

SoundTraxx Blunami BLU-2200 Manuel utilisateur

SPROLINK

SPROLINK VA1 Manuel utilisateur

Acclaim Lighting

Acclaim Lighting DDC-1-AC Manuel utilisateur

Nikon

Nikon AF-S TC-20E III Manuel utilisateur

Axis

Axis AXIS Q7406 Manuel utilisateur

Omega

Omega TAC80B-J Manuel utilisateur

Zoom

Zoom Thunderbolt TAC-2R Manuel utilisateur

OST

OST iConverter 10/100M Manuel utilisateur

Vertiv

Vertiv Netsure Manuel utilisateur

birddog

birddog MINI Manuel utilisateur

Roland

Roland GI-10 Manuel utilisateur

Wallenstein

Wallenstein WX310 Manuel utilisateur

Pace

Pace MSS 200-1 Manuel utilisateur

Solar Converters

Solar Converters EQ 12/24-50 Manuel utilisateur

CYP

CYP EL-7400V Manuel utilisateur

TIE

TIE MIDI 1i1o Manuel utilisateur

DCS

DCS Vivaldi Upsampler Manuel utilisateur

Westermo

Westermo MCW-211 SERIES Manuel utilisateur