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Linear Technology LTM8058 Demo Manual

Isolated ?module dc/dc converter with ldo post regulator
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Description
Demonstration circuit 1988A is a 2kV AC (3kVDC) isolated
flyback μModule
DC/DC converter with LDO post regulator
®
featuring the
LTM
8058. The demo circuit is designed for
®
a 6V flyback output and a 5V post regulator output from
a 4.5V to 30V input. The current capability of the 6V fly-
back output varies with input voltage from about 100mA
at 4.5V
to about 320mA at 30V
IN
typical maximum output current on V
not loaded. V
is the LDO post regulator from V
OUT2
The current capability of V
rent capability of V
minus V
OUT1
current limit on the LDO post regulator itself. R1 provides
the necessary minimum load current to keep the V
in regulation throughout the entire input voltage range.
Please see the typical performance characteristic curves
performance summary
PARAMETER
Minimum Input Voltage
Maximum Input Voltage
Output Voltage V
OUT1
Output Voltage V
OUT2
Voltage Ripple V
OUT1
Voltage Ripple V
OUT2
BoarD photo
Isolated μModule DC/DC Converter
. Figure 1 shows the
IN
when V
OUT1
OUT2
is limited by either the cur-
OUT2
loading or the 300mA
OUT1
Specifications are at T
CONDITIONS
V
= 7V to 30V
IN
V
= 7V to 30V
IN
V
= 12V, I
IN
V
= 12V, I
IN
DEMO MANUAL DC1988A
with LDO Post Regulator
in the LTM8058 data sheet to determine the minimum load
current for other input/output configurations.
The two-stage converter provides an isolated flyback output
as well as a low noise LDO output. Figure 2 shows the
output noise spectrum on V
output noise spectrum on V
The LTM8058 data sheet gives a complete description
is
of the device, operation and application information. The
.
OUT1
data sheet must be read in conjunction with this quick
start guide for demo circuit 1988A.
Design files for this circuit board are available at
http://www.linear.com/demo/DC1988A
OUT1
L, LT, LTC, LTM, µModule, 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
= 0mA, I
= 100mA
OUT2
OUT2
= 0mA, I
= 100mA
OUT2
OUT2
LTM8058
and Figure 3 shows the
OUT1
.
OUT2
VALUE
4.5V
30V
6V ±5%
5.0V ±3%
10mV
5mV
dc1988af
1

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Summary of Contents for Linear Technology LTM8058

  • Page 1 OUT1 in regulation throughout the entire input voltage range. L, LT, LTC, LTM, µModule, Linear Technology and the Linear logo are registered trademarks of Please see the typical performance characteristic curves Linear Technology Corporation. All other trademarks are the property of their respective owners.

  • Page 2: Quick Start Procedure

    DEMO MANUAL DC1988A Quick start proceDure Demo circuit 1988A is easy to set up to evaluate the per- formance of the LTM8058. Refer to Figure 4 for proper –10 measurement equipment setup and follow the procedure –20 below: –30 NOTE. When measuring the input or output voltage ripple, –40...
  • Page 3 DEMO MANUAL DC1988A Quick start proceDure + – + – LOAD – – – – – – LOAD + – dc1988a F04 Figure 4. DC1988A Proper Equipment Setup Figure 5. Measuring Input or Output Ripple dc1988af...

  • Page 4: Parts List

    DEMO MANUAL DC1988A parts List ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components CAP., CHIP, X5R, 10μF, 50V, 10% 1210 MÜRATA, GRM32ER71H106KA12L CAP., CHIP, X5R, 22μF, 16V, 10% 1206 AVX, 1206YD226KAT2A CAP., CHIP, X5R, 10μF, 16V, 10% 1206 AVX, 1206YD106KAT2A CAP., CHIP, X5R, 4.7μF, 50V, 20% 0805 TDK, C2012X5R1H475M CAP., CHIP, X7R, 0.01μF, 25V, 10% 0603...

  • 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.