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DC326B

Description
board eval for lt1766egn
CategoryDevelopment board/suite/development tools   
File Size346KB,9 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Environmental Compliance  
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DC326B Overview

board eval for lt1766egn

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 326C
1.5A, 200KHZ HIGH VOLTAGE BUCK CONVERTER
LT1766EFE
DESCRIPTION
Demonstration circuit 326C is a monolithic step-down
DC/DC switching converter featuring the LT1766EFE. The
board is optimized for 5V output at up to 1A load current
and a steady state input voltage range of 6V to 60V. With
its wide input voltage range, 1.5A internal power switch,
200kHz switching frequency and thermally enhanced
package, the LT1766EFE is a very versatile and powerful
IC for DC/DC converters that require compact space,
high efficiency and tolerance to high input voltage tran-
sients.
The LT1766EFE 200kHz switching frequency allows all of
the components to be small, surface mount devices.
Synchronization with an external clock of up to 700kHz
is possible. The current-mode control topology creates
fast transient response and good loop stability with a
minimum number of external components. The low re-
sistance internal power switch (0.2Ω) achieves high effi-
ciencies of up to 90%. The SHDN pin can be used to
Table 1. Typical Performance Summary (T
A
= 25°C)
PARAMETER
Steady State Input Voltage Range
Maximum Transient Input Voltage
V
OUT
Maximum Output Current
Output Voltage Ripple
Switching Frequency
Efficiency
V
IN
= 6V to 60V, I
OUT
1A
V
OUT
= 5V
V
IN
= 12V, I
OUT
= 1A, V
OUT
= 5V
V
IN
= 48V, I
OUT
= 1A, V
OUT
= 5V
V
IN
= 6V to 60V, I
OUT
1A
V
IN
= 12V, I
OUT
= 1A, V
OUT
= 5V
V
IN
= 48V, I
OUT
= 1A, V
OUT
= 5V
CONDITION
V
OUT
= 5V, I
OUT
1A
VALUE
6–60V
60V
5V ± 3%
1A
20mV
PK–PK
32mV
PK-PK
200kHz
87%
80%
program undervoltage lockout or place the part in mi-
cropower shutdown, reducing supply current to 25µA by
driving the pin low.
The LT1766EFE datasheet gives a complete description
of the part, operation and applications information. The
datasheet must be read in conjunction with this Quick
Start Guide for demonstration circuit 326C. In particular,
the datasheet section on ‘Thermal Calculations’ is impor-
tant for estimating whether a given application’s combi-
nation of input voltage, load current and frequency will
cause the LT1766EFE to exceed it’s absolute maximum
rated junction temperature. The LT1766EFE is assembled
in a small 16-pin thermally enhanced package with ex-
posed pad where proper board layout is essential for
maximum thermal performance. See the datasheet sec-
tion ‘Layout Considerations’.
Design files for this circuit board are available. Call
the LTC factory.
1
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