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Linear Technology LTM8045 Demo Manual
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Linear Technology LTM8045 Demo Manual

Inverting/sepic µmodule converter with up to 700ma output
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DESCRIPTION
Demo circuit DC1533A features the LTM
SEPIC μModule converter delivering up to 700mA of output
current. DC1533A is configured as an inverting converter,
but can be easily changed to a SEPIC configuration for
non-inverting step-up or step-down functionality. The
user adjustable features of the LTM8045 such as output
voltage, switching frequency, soft-start period and under-
voltage lockout can be changed on DC1533A simply by
PERFORMANCE SUMMARY
PARAMETER
Minimum Input Voltage, V
Maximum Input Voltage, V
Regulator Output Voltage, V
Maximum Output Current, I
Efficiency
Switching Frequency
BOARD PHOTO
Arrow.com.
Downloaded from
Inverting/SEPIC µModule Converter
®
8045, an inverting/
CONDITIONS
IN
IN
–
R2 = 60.4k
OUT
–
V
= 5V
OUT
IN
V
= 12V
IN
V
= 5V, I
IN
R1 = 130k
DEMO MANUAL DC1533A
with Up to 700mA Output
modifying or installing the appropriate resistors or capaci-
tor. The LTM8045 data sheet must be read in conjunction
with this demo manual to properly use or modify demo
circuit DC1533A.
Design files for this circuit board are available at
http://www.linear.com/demo
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.
(T
= 25°C)
A
–
= 400mA
OUT
LTM8045
MIN
TYP
MAX
2.8
18
–4.83
–5.19
430
580
80
700
UNITS
V
V
V
mA
mA
%
kHz
dc1533af
1

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Summary of Contents for Linear Technology LTM8045

  • Page 1 L, LT, LTC, LTM, μModule, Linear Technology and the Linear logo are registered trademarks of voltage lockout can be changed on DC1533A simply by Linear Technology Corporation. All other trademarks are the property of their respective owners.

  • Page 2: Quick Start Procedure

    ESR ceramic input capacitor to ring to NOTE: If the output voltage is too low, temporarily discon- twice its DC value. In order to protect the LTM8045, an nect the load to make sure that the load is not set too high.
  • Page 3 DEMO MANUAL DC1533A QUICK START PROCEDURE INPUT VOLTAGE (V) DC1533A F02 Figure 2. Maximum Output Current vs Input Voltage for V = –5V OR V DC1533A F03 Figure 3. Proper Scope Probe Technique dc1533af Arrow.com. Arrow.com. Arrow.com. Downloaded from Downloaded from Downloaded from...
  • Page 4 1. Start with DC1533A. Disconnect all supplies and loads. 2. Remove R2 and install R3 = 45.3k as shown in Figure 4. R3 MUST BE PRESENT BEFORE OPERATION OTHERWISE THE LTM8045 MAY BE DAMAGED. Figure 4 3. Make three cuts on the top copper to separate the terminal labeled GND from the ground plane, as shown in Figure 5.
  • Page 5 DEMO MANUAL DC1533A – 4. Solder the exposed copper together with braid to connect the terminal labeled V to the ground plane, as shown – in Figure 6. The terminal labeled V is now GND. Figure 6 5. Change C2 to 100μF 6.3V 1206 or 1210. Change R1 to 115k to optimize the switching frequency. dc1533af Arrow.com.

  • Page 6: Parts List

    DEMO MANUAL DC1533A PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components CAP ., X7R, 4.7μF , 25V, 10%, 1206 NIC, NMC1206X7R475K25TRPLPF CAP ., X5R, 22μF , 16V, 10%, 1206 AVX, 1206YD226KAT2A CAP ., X7R, 10nF , 16V, 10%, 0603 AVX, 0603YC103KAT2A RES., CHIP , 130k, 1% ,0603 VIAHSY, CRCW0603130KFKEA...

  • 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.