Linear Technology LT1930ES5 Manuale utente

DEMO CIRCUIT 383B

QUICK START GUIDE

LT1930ES5/LT1931ES5

1.2MHz, SOT-23 DC/DC CON ERTER

DESCRIPTION

Demonstration Circuit 383B is multipurpose demon-

stration board featuring the LT1930 and LT1931. The

demo board offers three separate DC DC converters.

The Boost circuit is designed to convert 5V input to

12V output at 300mA maximum load. The SEPIC cir-

cuit generates constant 12V 300mA output with

10V~16V variable input. The Inverter circuit is de-

signed for applications requiring negative 12V 350mA

from a positive 12V input. All three circuits are de-

signed to demonstrate the advantages of the 1.2MHz

switching frequency, the internal 36V 1A switch, wide

input voltage range and small circuit size. These cir-

cuits are intended for space-conscious applications

such as digital cameras, cellular phones, palmtop

computers and LCD displays. The 1.2MHz switching

frequency, 1A integrated switch, small circuit size,

and low component count makes the LT1930 and

LT1931 suitable for use in many other applications,

such as PC cards, miniature disk drives, xDSL power

supplies, flash memory products and local 5V or 12V

supplies.

The LT1930 LT1931 datasheets give complete

descriptions of the parts, their operation and application

information. The datasheets must be read in conjunction

with this quick start guide for working on or modifying

any circuit on the demo circuit 383B.

Design files for this circuit board are available. Call

the LTC factory.

LT is a trademark of Linear Technology Corporation

Table 1.

Performance Summary

SPECIFICATIONS ARE AT TA = 25°C

SYMBOL P R METER FOR BOOST CONVERTER CONDITIONS MIN TYP M X UNITS

Input Supply Range

5 V

OUT

Output Voltage Accuracy V

= 5V, I

LOAD

= 300mA 11.76 12 12.24 V

Ripple V

= 5V, I

LOAD

= 300mA 50 mV

Fs Switching Frequency 1.2 MHz

SYMBOL P R METER FOR SEPIC CONVERTER CONDITIONS MIN TYP M X UNITS

Input Supply Range

10 16 V

OUT

Output Voltage Accuracy V

= 10V, I

LOAD

= 300mA 11.76 12 12.24 V

Ripple V

=105V, I

LOAD

= 300mA 50 mV

Fs Switching Frequency 1.2 MHz

SYMBOL P R METER FOR INVERTING CONVERTER CONDITIONS MIN TYP M X UNITS

Input Supply Range

12 V

OUT

Output Voltage Accuracy V

= 12V, I

LOAD

= 350mA -11.76 -12 -12.24 V

Ripple V

= 12V, I

LOAD

= 350mA 40 mV

Fs Switching Frequency 1.2 MHz

QUICK START PROCEDURES

Refer to Figures 1–4 for proper measurement

equipment setup and follow the procedure outlined

below:

The equipment setup for the three circuits is very

similar. They all have three pins marked “Vin,”

“Gnd” and “Vout,” and a jumper marked “on off”

for demonstrating the shutdown function.

For the best accuracy it is important to connect true

RMS reading voltmeters directly to the PCB termi-

nals, where the input and output voltage are con-

nected. True RMS reading ammeters should be

used for current measurements.

The SHUTDOWN function is tested by placing the

jumper in the “off” position. This will short the

shutdown pin to ground and turn off the internal

switch of the LT1930 LT1931. Placing the jumper in

the “on” position will return the circuit to normal

operation.

Quick Start for the Boost Circuit:

1. Before turning on the power, connect a 5V, 1A

bench supply to the Vin and Gnd terminals and

connect the output loads (up to 300mA). When an

electronic load is used, decrease load current set-

ting to less than 100mA until the output voltage has

stabilized. Connect an oscilloscope and meters to

the Vout and Gnd terminals, as shown in Figure 1.

2. Turn on the input power supply and observe the

output. The DC383 Boost converter is programmed

to generate 12V from 5V input. The circuit will de-

liver up to 300mA at 12V.

3. The current limit is tested by increasing the load

past 400mA. The current limit will take effect when

the peak switch current becomes higher than ~1A.

When the current limit is exceeded, the output volt-

age will drop drastically. Return to normal operation

by removing the load.

Quick Start for the SEPIC Circuit:

1. Before turning on the power, connect a 16V, 1A

bench supply to the Vin and Gnd terminals and

connect the output loads (up to 300mA). When an

electronic load is used, decrease load current set-

ting to less than 100mA until the output voltage has

stabilized. Connect oscilloscope and meters to the

Vout and Gnd terminals, as shown in Figure 2.

2. Turn on the input power supply and observe the

output. The DC383 SEPIC Circuit is programmed to

generate 12V from a 10V–16V input. Vary the input

voltage to test the line regulation. The circuit is de-

signed to deliver up to 300mA at a 12V output.

3. The current limit is tested by increasing the load

past 400mA. The current limit will take effect when

the peak switch current becomes higher than ~1A.

When the current limit is exceeded, the output volt-

age will drop drastically. Return to normal operation

by removing the load.

Quick Start for the Inverter Circuit:

1. Before turning on the power, connect a 12V, 1A

bench supply to the Vin and Gnd terminals and

connect the output loads (up to 300mA). When an

electronic load is used, decrease load current set-

ting to less than 100mA until the output voltage has

stabilized. Connect oscilloscope and meters to the

Vout and Gnd terminals, as shown in Figure 3.

2. Turn on the input power supply and observe the

output. The DC383 Inverter Circuit is programmed

to generate –12V from a +12V input. The circuit will

deliver up to 300mA at –12V.

3. The current limit is tested by increasing the load

past 500mA. The current limit will take effect when

the peak switch current becomes higher than ~1A.

When the current limit is exceeded, the output volt-

age will drop drastically. Return to normal operation

by removing the load.

Figure 1.

Proper Measurement Equipment Setup for Boost Converter

Figure 2.

Proper Measurement Equipment Setup for Sepic Converter

Figure 3.

Proper Measurement Equipment Setup for Inverting Converter

Figure 4.

Proper Input/Output Ripple Measurement Technique

Mouser Electronics

Authorized Distributor

Click to View Pricing, Inventory, Delivery & Lifecycle Information:

Analog Devices Inc.:

DC383B

Questo manuale è adatto per i seguenti modelli

Indice

Altri manuali Linear Technology Convertitore multimediale

Linear Technology

Linear Technology DC1731A-A Guida rapida alla configurazione

Linear Technology

Linear Technology DC1228A Guida rapida alla configurazione

Linear Technology

Linear Technology LTC3459ES6 Manuale utente

Linear Technology

Linear Technology LTC3130EUD-1 Manuale utente

Linear Technology

Linear Technology DC193 Guida rapida alla configurazione

Linear Technology

Linear Technology DC1745A Guida rapida alla configurazione

Linear Technology

Linear Technology DC1480A Guida rapida alla configurazione

Linear Technology

Linear Technology LTC2668 Guida rapida alla configurazione

Linear Technology

Linear Technology LTM8046 Guida utente

Linear Technology

Linear Technology LTC3118EUFD Guida rapida alla configurazione

Linear Technology

Linear Technology LT1952-1 Manuale utente

Linear Technology

Linear Technology DC2221A Guida rapida alla configurazione

Linear Technology

Linear Technology DC2111A-A/B Guida rapida alla configurazione

Linear Technology

Linear Technology DC2490A Guida rapida alla configurazione

Linear Technology

Linear Technology LTC3455EUF-1 Manuale utente

Linear Technology

Linear Technology DEMONSTRATION CIRCUIT 518 Manuale utente

Linear Technology

Linear Technology DC1516A Manuale utente

Linear Technology

Linear Technology DC1739B-C Guida rapida alla configurazione

Linear Technology

Linear Technology DC2341A Guida rapida alla configurazione

Linear Technology

Linear Technology Analog Devices LT8301 Guida rapida alla configurazione

Linear Technology

Linear Technology LTC1966 Manuale utente

Linear Technology

Linear Technology LT3464ETS8 Manuale utente

Linear Technology

Linear Technology DC2434A Guida rapida alla configurazione

Linear Technology

Linear Technology DC164 Guida rapida alla configurazione

Manuali Convertitore multimediale popolari di altre marche

SoundTraxx

SoundTraxx Blunami BLU-2200 Manuale utente

SPROLINK

SPROLINK VA1 Manuale utente

Acclaim Lighting

Acclaim Lighting DDC-1-AC Manuale utente

Nikon

Nikon AF-S TC-20E III Manuale utente

Axis

Axis AXIS Q7406 Manuale utente

Omega

Omega TAC80B-J Manuale utente

Zoom

Zoom Thunderbolt TAC-2R Manuale utente

OST

OST iConverter 10/100M Manuale utente

Vertiv

Vertiv Netsure Manuale utente

birddog

birddog MINI Manuale utente

Roland

Roland GI-10 Manuale utente

Wallenstein

Wallenstein WX310 Manuale utente

Pace

Pace MSS 200-1 Manuale utente

Solar Converters

Solar Converters EQ 12/24-50 Manuale utente

CYP

CYP EL-7400V Manuale utente

TIE

TIE MIDI 1i1o Manuale utente

DCS

DCS Vivaldi Upsampler Manuale utente

Westermo

Westermo MCW-211 SERIES Manuale utente