Linear Technology Analog Devices DC2814A-A Demo Manual

High Voltage, High Efficiency Synchronous Buck-Boost
DESCRIPTION
Demonstration circuit 2814A-A is a high voltage, high
efficiency synchronous buck-boost DC/DC converter with
an input voltage range of 8V to 80V. After the part has
started, the input voltage can run down to 3.5V. It can
supply a 3A maximum load current with an output range
of 8V to 16V. The demo board features the
controller. The constant frequency current mode architec-
ture allows a phase-lockable frequency of up to 400kHz,
while an optional input or output current feedback loop
provides support for applications such as battery charg-
ing. With a wide input range, wide output range, and
seamless transfers between operation modes, the LT8210
is ideal for industrial, automotive, medical, military, and
avionics applications.
The converter has four modes of operation: burst, pulse
skip, forced continuous mode, or pass-thru. Pass-thru is
a feature that passes the input directly to the output when
PERFORMANCE SUMMARY
PARAMETER
Input Voltage Range, V
Output Voltage, V
OUT
Maximum Output Current, I
Default Operating Frequency
Typical Efficiency
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Converter with Input to Output Pass-Thru
CONDITIONS
IN
V = 3.5V (8V Start-Up) to 80V, I
IN
V = 3.5V (8V Start-Up) to 80V, V
OUT IN
6V , 8V
IN
8V , 8V
IN
12V , 12V
IN
17V , 16V
IN
30V , 16V
IN
DEMO MANUAL DC2814A-A
the input voltage is within a user programmable window.
Switching losses drop to zero and efficiency is maximized.
For input voltage above or below the pass-thru window,
the buck or boost regulation loops maintain the output
at the set maximum or minimum values, respectively.
LT8210EUJ Reverse input protection is also implemented on this
demo board.
The available versions of the DC2814A are:
DC2814A-A: 8V to 40V
Down to 3.5V
DC2814A-B: 9V to 36V
V = 24V to 36V at 2.5A
OUT
DC2814A-C: 26V to 80V
Design files for this circuit board are
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Specifications are at T = 25°C
A
= 0A to 3A
OUT
= 8V to 16V
OUT
(Boost), 3A
OUT
(Buck-Boost), 3A
OUT
(Pass-Thru), 3A
OUT
(Buck-Boost), 3A
OUT
(Buck), 3A
OUT
, 80V Surge (60s), Operates
IN IN
after Start-Up, V = 8V to 16V at 3A
IN OUT
, 80V Surge (60s),
IN IN
, V = 36V to 56V at 2A
IN OUT
available.
VALUE
8V to 40V Continuous, 80V Surge (60 Seconds)
(Operates Down to 3.5V after Start-Up)
8V to 16V
3A
385kHz (R = 16.9k)
T
94%
94%
98%
95%
94%
LT8210
Rev. 0
1