Advertisement
Table of Contents
DESCRIPTION
The DC2049A demonstrates how a power supply regulates
two output voltage by using the
(LDO) regulators.
The LT3999 is a monolithic push-pull DC/DC driver which
features wide input range and small external passive
components.
The LT3999 has duty circle control for ΔV
tion, which allows for a wide input voltage range and low
LDO losses.
The DC2049A employs a push-pull topology that inherently
provides a low-noise solution. The design is well suited
to noise sensitive systems such as medical instruments,
industrial sensing and control, data conversion and wide
band communications. The post regulator LDOs reduce
output noise further. For more details about the LDOs,
please check the LT3065 and LT3090 data sheets.
PERFORMANCE SUMMARY
PARAMETERS
Input Voltage Range
Output Voltage 1 (VOUT1)
Output Voltage 2 (VOUT2)
Output Current 1
Output Current 2
Switching Frequency
Isolation
LT
3999
and low dropout
®
compensa-
IN
Specifications are at T
DEMO MANUAL DC2049A
Low Noise Isolated
The DC2049A produces an isolated 12V
up to 200mA each from a 10V ~ 15.5V input voltage range.
This board can be modified, by changing the transformer
(and duty cycle), to produce other output voltages.
The DC2049A features a small transformer, small inductors
and capacitors that work at a 1MHz switching frequency.
The LT3999 data sheet gives a complete description of the
part, operation and applications information. The data sheet
must be read in conjunction with this demo manual. The
LT3999EMSE is assembled in a 10-lead plastic MSE pack-
age with a thermally enhanced ground pad. Proper board
layout is essential for maximum thermal performance. See
the data sheet section Layout Consideration Check List.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2049A
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
= 25°C
A
MIN
10.0
11.64
–12.36
0
0
LT3999EMSE
Power Supply
and –12V
OUT
OUT
TYP
MAX
UNITS
15.5
12.0
12.3
–12.0
–11.64
200
200
1.0
1000
dc2049af
at
VDC
VDC
VDC
mA
mA
MHz
VDC
1
Advertisement
Table of Contents
Related Manuals for Linear Technology DC2049A
Summary of Contents for Linear Technology DC2049A
-
Page 1: Power Supply
For more details about the LDOs, http://www.linear.com/demo/DC2049A please check the LT3065 and LT3090 data sheets. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. PERFORMANCE SUMMARY Specifications are at T = 25°C... - Page 2 DEMO MANUAL DC2049A QUICK START PROCEDURE DC2049A is easy to set up to evaluate the performance of 3. Turn the input power supply on and make sure the the LT3999EMSE. Refer to Figure 1 for proper measure- voltage is between 10V and 15.5V.
-
Page 3: Quick Start Procedure
DEMO MANUAL DC2049A QUICK START PROCEDURE POWER LOSS EFFICIENCY = 200mA OUT1 = 200mA OUT2 dc2049a F02 Figure 2. Efficiency and Power Loss vs Input Voltage with LT3999 and LDOs Figure 3. Switch Node Voltage, V = 10V Figure 4. Switch Node Voltage, V = 15V Figure 5. -
Page 4: Parts List
DEMO MANUAL DC2049A PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components I.C., Push-Pull DC/DC Driver Linear Tech. Corp. LT3999EMSE#PBF I.C., Low Noise Linear Reg. Linear Tech. Corp. LT3065EDD#PBF I.C., Negative Linear Reg. Linear Tech. Corp. LT3090EDD#PBF D1, D2, D3, D4 Schottky Diode 200V/1AMP Central Semi. -
Page 5: 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 6 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.
Need help?
Do you have a question about the DC2049A and is the answer not in the manual?
Questions and answers