2024年3月16日发(作者:斯菡梅)
DEMO MANUAL DC2599A
LT8361
Low I
Q
Boost/SEPIC/
Inverting Regulator
DESCRIPTION
Demonstration circuit 2599A features the LT
®
8361 in a
SEPIC configuration. It operates with a switching fre-
quency of 400kHz and is designed to convert a 4.5V to
48V source to 24V, with up to 600mA output current
(depending on input voltage). Refer to Figure 4 for load
current versus input voltage.
The LT8361 can operate with inputs as high as 60V. How-
ever, in this demo circuit, the input is limited by the voltage
rating of the input capacitors.
The demo board contains a selectable jumper, JP1, to aid
in the selection of the desired Sync pin mode of operation.
The default setting is Burst Mode
®
operation.
This layout is optimized for good EMI performance and
small solution size. Input and output filters and an opti-
mized power switching loop, comprised of C20 and C21
are necessary to pass CISPR 25 Class 5 emissions, and
are added by default. These components can be excluded
in applications not requiring noise immunity. Radiated
emissions plots are included in this manual.
The data sheet gives a complete description of the device,
operation and application information. The data sheet
must be read in conjunction with this demo manual.
Design files for this circuit board are available at
/DC2599A
All registered trademarks and trademarks are the property of their respective owners.
PERFORMANCE SUMMARY
SYMBOL
V
IN
V
OUT
Ripple
Efficiency
Switching Frequency
PARAMETER
Input Supply Range
Output Voltage Range
Specifications are at T
A
= 25°C
CONDITIONS
V
IN
= 12V, I
LOAD
= 450mA
V
IN
= 12V, I
LOAD
= 450mA
V
IN
= 12V, I
LOAD
= 450mA
MIN
4.5
23.2524
200
87
400
TYPMAX
48
24.75
UNITS
V
V
mV
%
kHz
UG-1367 Rev 0
1
DEMO MANUAL DC2599A
QUICK START PROCEDURE
Demo circuit 2599A is easy to set up to evaluate the per-
formance of the LT8361. Refer to Figure 1 for proper
measurement equipment setup and follow the procedure
below:
NOTE: When measuring the input or output voltage ripple,
care must be taken to avoid a long ground lead on the
oscilloscope probe. Measure the input or output voltage
ripple by touching the probe tip directly across the V
IN
or
V
OUT
and GND terminals. See Figure 2 for proper scope
probe technique.
1. With power off, connect the input power supply to V
IN
and GND.
2. Turn on the power at the input.
NOTE: Make sure that the input voltage does not exceed
48V.
3. Check for the proper output voltage.
If there is no output, temporarily disconnect the load
to make sure that the load is not set too high.
4. Once the proper output voltages are established, adjust
the load within the operating range and observe the
output voltage regulation, ripple voltage, efficiency and
other parameters.
+
+
–
I
IN
–
+
–
V
IN
+
+
–
I
OUT
–
+
LOAD
POWER
SUPPLY
V
OUT
–
/8361
DC2599 F01
Figure 1. DC2599A Proper Equipment Setup
VINGND
Figure 2. Measuring Input or Output Ripple
2
UG-1367 Rev 0
2024年3月16日发(作者:斯菡梅)
DEMO MANUAL DC2599A
LT8361
Low I
Q
Boost/SEPIC/
Inverting Regulator
DESCRIPTION
Demonstration circuit 2599A features the LT
®
8361 in a
SEPIC configuration. It operates with a switching fre-
quency of 400kHz and is designed to convert a 4.5V to
48V source to 24V, with up to 600mA output current
(depending on input voltage). Refer to Figure 4 for load
current versus input voltage.
The LT8361 can operate with inputs as high as 60V. How-
ever, in this demo circuit, the input is limited by the voltage
rating of the input capacitors.
The demo board contains a selectable jumper, JP1, to aid
in the selection of the desired Sync pin mode of operation.
The default setting is Burst Mode
®
operation.
This layout is optimized for good EMI performance and
small solution size. Input and output filters and an opti-
mized power switching loop, comprised of C20 and C21
are necessary to pass CISPR 25 Class 5 emissions, and
are added by default. These components can be excluded
in applications not requiring noise immunity. Radiated
emissions plots are included in this manual.
The data sheet gives a complete description of the device,
operation and application information. The data sheet
must be read in conjunction with this demo manual.
Design files for this circuit board are available at
/DC2599A
All registered trademarks and trademarks are the property of their respective owners.
PERFORMANCE SUMMARY
SYMBOL
V
IN
V
OUT
Ripple
Efficiency
Switching Frequency
PARAMETER
Input Supply Range
Output Voltage Range
Specifications are at T
A
= 25°C
CONDITIONS
V
IN
= 12V, I
LOAD
= 450mA
V
IN
= 12V, I
LOAD
= 450mA
V
IN
= 12V, I
LOAD
= 450mA
MIN
4.5
23.2524
200
87
400
TYPMAX
48
24.75
UNITS
V
V
mV
%
kHz
UG-1367 Rev 0
1
DEMO MANUAL DC2599A
QUICK START PROCEDURE
Demo circuit 2599A is easy to set up to evaluate the per-
formance of the LT8361. Refer to Figure 1 for proper
measurement equipment setup and follow the procedure
below:
NOTE: When measuring the input or output voltage ripple,
care must be taken to avoid a long ground lead on the
oscilloscope probe. Measure the input or output voltage
ripple by touching the probe tip directly across the V
IN
or
V
OUT
and GND terminals. See Figure 2 for proper scope
probe technique.
1. With power off, connect the input power supply to V
IN
and GND.
2. Turn on the power at the input.
NOTE: Make sure that the input voltage does not exceed
48V.
3. Check for the proper output voltage.
If there is no output, temporarily disconnect the load
to make sure that the load is not set too high.
4. Once the proper output voltages are established, adjust
the load within the operating range and observe the
output voltage regulation, ripple voltage, efficiency and
other parameters.
+
+
–
I
IN
–
+
–
V
IN
+
+
–
I
OUT
–
+
LOAD
POWER
SUPPLY
V
OUT
–
/8361
DC2599 F01
Figure 1. DC2599A Proper Equipment Setup
VINGND
Figure 2. Measuring Input or Output Ripple
2
UG-1367 Rev 0