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Table of Contents
DESCRIPTION
Demonstration circuit DC2061 is a DC/DC synchro-
nous boost converter featuring the
stant frequency current mode synchronous boost
controller. The DC2061A operates over a 6V to 60V
input, develops a 48V output and provides 3A to 12A
of output current as shown in Figure 3. The 150kHz
(2 • 150kHz at the output) constant frequency operation
results in a small and efficient circuit. The converter pro-
vides high output voltage accuracy (typically ±3%) over
wide load range with no minimum load requirement. The
PERFORMANCE SUMMARY
PARAMETER
Minimum Input Voltage
Maximum Input Voltage
V
OUT
Typical Output Ripple V
OUT
Nominal Switching Frequency
QUICK START PROCEDURE
Demonstration circuit DC2061 is easy to set up to evaluate
the performance of the LTC3784. For proper measure-
ment equipment setup refer to Figure 1 and follow the
procedure below:
Note: When measuring the input or output voltage ripple,
care must be taken to minimize the length of oscilloscope
probe ground lead. Measure the input or output voltage
ripple by connecting the probe tip directly across the VIN
or VOUT and GND terminals as shown in Figure 2.
1. With power off, connect the input power supply to VIN
and GND.
2. Keep the load set to 0A or disconnected.
3. Turn the input power source on and slowly increase
the input voltage. Be careful not to exceed 60V.
DEMO MANUAL DC2061A
High Efficiency PolyPhase
Synchronous Boost Converter
demonstration circuit can be easily modified to generate
LTC
3784
con-
different output voltages.
®
The DC2061 has a small circuit footprint. It is a high per-
formance and cost effective solution for telecom, auto-
motive and Power over Ethernet applications.
Design files for this circuit board are available at
http://www.linear.com/demo
L, LT, LTC, LTM, Linear Technology, the Linear logo and PolyPhase are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
Specifications are at T
CONDITION
I
= 0A to 3A
OUT
I
= 0A to 12A
OUT
V
= 6V to 47V, I
= 0A to 3A
IN
OUT
V
= 6V to 47V, I
= 3A
IN
OUT
Note: Make sure that the input voltage, V
ceed 60V. If higher operating voltage is required, power
components with higher voltage ratings should be used.
When the input voltage is set higher than 48V the output
voltage will follow the input voltage.
4. Set the input voltage to 6V and check for the proper
output voltage of 48V. Set the output load to 2A. If there
is no output, temporarily disconnect the load to make
sure that the load is not set too high.
5. Once the proper output voltage is established, adjust
the load and observe the output voltage regulation,
ripple voltage, efficiency and other parameters.
= 25°C
A
VALUE
6V
60V
48V ±3%
200mV
P-P
150kHz
LTC3784
®
, does not ex-
IN
dc2061af
1
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Related Manuals for Linear Technology DC2061A
Summary of Contents for Linear Technology DC2061A
- Page 1 The converter pro- vides high output voltage accuracy (typically ±3%) over L, LT, LTC, LTM, Linear Technology, the Linear logo and PolyPhase are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective wide load range with no minimum load requirement.
- Page 2 DEMO MANUAL DC2061A QUICK START PROCEDURE Figure 1. Proper Measurement Equipment Setup – COUT VOUT Figure 2. Measuring Input or Output Ripple dc2061af...
-
Page 3: Quick Start Procedure
The DC2061 output current capability depends on the input voltage and proper cooling. Typical performance of DC2061A is shown in Figure 3. As can be seen from Fig- ure 3, the output current capability depends on the input voltage. Also, when input voltage is equal to, or higher... -
Page 4: Bias Circuit
DEMO MANUAL DC2061A QUICK START PROCEDURE Bias Circuit The LTC3784 can operate with input voltages up to 65V. However, depending on input voltage, operating frequency and MOSFETs that are used the power dissipation in the part may become too high. In order to provide bias power at high input voltage the DC2061 circuit is equipped with high efficiency bias circuit LTC3630A. - Page 5 DEMO MANUAL DC2061A PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER R17, R23 RES., Chip, 10Ω, 1%, 0603 VISHAY, CRCW060310R0FKEA R26, R35 RES., Chip, 100k, 1%, 0603 VISHAY, CRCW0603100KFKEA RES., Chip, 47k, 1%, 0603 VISHAY, CRCW060347K0FKEA RES., Chip, 523k, 1%, 0603 VISHAY, CRCW0603523KFKEA RES., Chip, 150k ,1%, 0603...
- Page 6 DEMO MANUAL DC2061A SCHEMATIC DIAGRAM dc2061af...
-
Page 7: Schematic Diagram
Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. - Page 8 Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions: This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods.
- Page 9 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Analog Devices Inc. DC2061A...
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