1 dc2328af DEMO MANUAL DC2328A DESCRIPTION LTM4651 EN55022B Compliant 58V, 24W Inverting-Output DC/DC µModule Regulator Demonstration circuit 2328A is an inverting buck-boost converter with 12V to 34V input voltage, –24V output volt- age and max 2A output current capability, which features the LTM ® 4651Y. The LTM4651 is an ultralow noise, 58V, 24W inverting-topology DC/DC µModule regulator. It is designed to meet the radiated emissions requirement of EN55022B. A switching frequency range of 250kHz to L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Analog Devices, Inc. All other trademarks are the property of their respective owners. PERFORMANCE SUMMARY BOARD PHOTO 3MHz is supported and the module can synchronize to an external clock. The LTM4651 data sheet must be read in conjunction with this demo manual prior to working on or modifying demo circuit DC2328A. Design files for this circuit board are available at http://www.linear.com/demo/DC2328A Specifications are at T A = 25°C DC2328A Top View PARAMETER CONDITIONS VALUE Input Voltage Range 12V to 34V Output Voltage, V OUT 12V IN , 0A to 1A; 24V IN , 0A to 2A; 34V IN , 0A to 2A –24V ±2% Maximum Output Current, I OUT Derating for Certain V IN and Thermal Conditions 2A Default Operating Frequency 1.2MHz Efficiency 24V IN , –24V OUT , 2A 87.5%
Transcript
1dc2328af
DEMO MANUAL DC2328A
Description
LTM4651EN55022B Compliant 58V, 24W
Inverting-Output DC/DC µModule Regulator
Demonstration circuit 2328A is an inverting buck-boost converter with 12V to 34V input voltage, –24V output volt-age and max 2A output current capability, which features the LTM®4651Y. The LTM4651 is an ultralow noise, 58V, 24W inverting-topology DC/DC µModule regulator. It is designed to meet the radiated emissions requirement of EN55022B. A switching frequency range of 250kHz to
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Analog Devices, Inc. All other trademarks are the property of their respective owners.
performance summary
BoarD photo
3MHz is supported and the module can synchronize to an external clock. The LTM4651 data sheet must be read in conjunction with this demo manual prior to working on or modifying demo circuit DC2328A.
Design files for this circuit board are available at http://www.linear.com/demo/DC2328A
Specifications are at TA = 25°C
DC2328A Top View
PARAMETER CONDITIONS VALUE
Input Voltage Range 12V to 34V
Output Voltage, VOUT 12VIN, 0A to 1A; 24VIN, 0A to 2A; 34VIN, 0A to 2A –24V ±2%
Maximum Output Current, IOUT Derating for Certain VIN and Thermal Conditions 2A
Quick start proceDureDemonstration circuit 2328A is easy to set up to evaluate the performance of the LTM4651Y. Refer to Figure 1 for the proper measurement equipment setup and follow the procedure below:
1. With power off, connect the input power supply to VIN (12V to 34V) and GND (input return).
2. Connect the – 24V output load between VOUT ( – ) and GND (+) (Initial load: no load).
3. Connect the DVMs to the input and output. Set the default jumper position, JP2: ON.
4. Turn on the input power supply and check for the proper output voltages. VOUT should be –24V ±2%.
5. Once the proper output voltages are established, adjust the loads within the operating range and observe the output voltage regulation, ripple voltage and other parameters.
Note: When measuring the output or input voltage ripple, do not use the long ground lead on the oscil-loscope probe. See Figure 2 for the proper scope probe technique. Short, stiff leads need to be soldered to the (+) and (–) terminals of an output capacitor. The probe’s ground ring needs to touch the (–) lead and the probe tip needs to touch the (+) lead.
Figure 1. Proper Measurement Equipment Setup
Figure 2. Measuring Output Voltage Ripple
DC2328 F01
LOADVIN12V TO 34V
+ –IOUT
SHUNT10mΩ
IIN
SHUNT10mΩ
+ –
–
+VIN
–
+VOUT
–
+
+ –
VOUT GND
COUT
3dc2328af
DEMO MANUAL DC2328A
Quick start proceDure
Figure 3. Efficiency vs Load Current (VOUT = –24V) Figure 4. Efficiency vs Load Current (VOUT = –12V)
Besides the default –24V output voltage which shows the full capacity of LTM4651, it is very easy to customize the DC2328A demo board to make other negative output voltages available. As an example, to implement –12VOUT with 5V – 36V VIN,
1. Change R4 from 14k to 39k. This sets the minimum operation input voltage, 5V for this case.
2. Change R1 and R8 from 240k to 121k. This sets the output voltage, –12V for this case.
Check the input and output capacitor voltage rating. And then it is done.
However, to maximize the efficiency of the regulator for different input voltage, the switching frequency can be adjusted by changing R13. For the recommended switch-ing frequency for given input voltage and given output voltage, please refer to the LTM4651 data sheet.
The results for the –12VOUT are listed below.
For 5VIN, change R13 from 124k to 1.3MΩ. The switching frequency will be 475kHz. For 12VIN, change R13 from 124k to 237k. The switching frequency will be 825kHz. For 24VIN, change R13 from 124k to 143k. The switch-ing frequency will be 1.1MHz. For 36VIN, keep the default R13. The switching frequency will be 1.2MHz.
The optimized efficiency for –12VOUT is as shown in Figure 4.
Figure 11. Radiated Emissions Scan of the LTM4651. Producing –24VOUT at 1A, from 12VIN. DC2328A Hardware. fSW = 1.2MHz. Measured in a 10m Chamber. Peak Detect Method
Figure 12. Radiated Emissions Scan of the LTM4651 Producing –24VOUT at 2A, from 25VIN. DC2328 Hardware. fSW = 1.2MHz. Measured in a 10m Chamber. Peak Detect Method
Figure 13. Radiated Emissions Scan of the LTM4651. Producing –24V at 2A, from 34V. DC2328A Hardware. fSW = 1.2MHz. Measured in a 10m Chamber. Peak Detect Method
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DEMO MANUAL DC2328A
parts ListITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
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.
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8dc2328af
DEMO MANUAL DC2328A
LINEAR TECHNOLOGY CORPORATION 2017
LT 0617 • PRINTED IN USA
DEMONSTRATION BOARD IMPORTANT NOTICE
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. As a prototype, this product does not fall within the scope of the European Union directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.
If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or agency certified (FCC, UL, CE, etc.).
No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.
LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive.
Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and observe good laboratory practice standards. Common sense is encouraged.
This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC application engineer.
