DC1868A (Rev. 0) · 2019-12-04 · 1 DEMO MANUAL DC1868A Re 0 DESCRIPTION LTM8024 40V, Dual 3A...
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1 DEMO MANUAL DC1868A Rev. 0 DESCRIPTION LTM8024 40V, Dual 3A Step-Down µModule Regulator Demonstration circuit 1868A is a dual step-down DC/DC switching converter featuring the LTM ® 8024 μModule regulator. The demo board is designed to deliver dual 5V/3A and 3.3V/3A outputs from a 7V to 40V input. The Silent Switcher ® architecture minimizes EMI while achiev- ing high efficiency at frequencies up to 3MHz. The modes of operation (Burst Mode or Discontinuous Mode/SYNC) are jumper selectable. Burst Mode operation improves efficiency at light loads. The LTM8024 is a fixed frequency PWM regulator with current mode control scheme. The switching frequency All registered trademarks and trademarks are the property of their respective owners. PERFORMANCE SUMMARY is set by an appropriate resistor (R11) from the RT pin to ground. The RUN pins (EN1/EN2 terminals) can be used to set the LTM8024 in micro power shutdown mode. The power good output of each channel (PG1 or PG2 terminal) will be low when that channel’s output voltage is outside of the ±7.5% regulation window. The LTM8024 data sheet gives a complete description of the operation and application information. The data sheet must be read in conjunction with this demo manual. Design files for this circuit board are available. Specifications are at T A = 25°C PARAMETER CONDITION VALUE Input Voltage Range 7V to 40V Output Voltage, V OUT1 V IN = 7V to 40V, I OUT1 = 0A to 3A 5V ± 3% Output Voltage, V OUT2 V IN = 7V to 40V, I OUT2 = 0A to 3A 3.3V ± 3% Maximum Output Current, I OUT1 V IN = 7V to 40V, V OUT1 = 5V 3A Maximum Output Current, I OUT2 V IN = 7V to 40V, V OUT2 = 3.3V 3A Typical Switching Frequency 1MHz Typical Efficiency, V OUT1 (5V) V IN = 12V, I OUT1 = 3A 93.2% Typical Efficiency, V OUT2 (3.3V) V IN = 12V, I OUT2 = 3A 91.3% BOARD PHOTO
Transcript of DC1868A (Rev. 0) · 2019-12-04 · 1 DEMO MANUAL DC1868A Re 0 DESCRIPTION LTM8024 40V, Dual 3A...
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DEMO MANUAL DC1868A
Rev. 0
DESCRIPTION
LTM8024 40V, Dual 3A Step-Down µModule Regulator
Demonstration circuit 1868A is a dual step-down DC/DC switching converter featuring the LTM®8024 μModule regulator. The demo board is designed to deliver dual 5V/3A and 3.3V/3A outputs from a 7V to 40V input. The Silent Switcher® architecture minimizes EMI while achiev-ing high efficiency at frequencies up to 3MHz. The modes of operation (Burst Mode or Discontinuous Mode/SYNC) are jumper selectable. Burst Mode operation improves efficiency at light loads.
The LTM8024 is a fixed frequency PWM regulator with current mode control scheme. The switching frequency
All registered trademarks and trademarks are the property of their respective owners.
PERFORMANCE SUMMARY
is set by an appropriate resistor (R11) from the RT pin to ground. The RUN pins (EN1/EN2 terminals) can be used to set the LTM8024 in micro power shutdown mode. The power good output of each channel (PG1 or PG2 terminal) will be low when that channel’s output voltage is outside of the ±7.5% regulation window.
The LTM8024 data sheet gives a complete description of the operation and application information. The data sheet must be read in conjunction with this demo manual.
Design files for this circuit board are available.
Specifications are at TA = 25°C
PARAMETER CONDITION VALUE
Input Voltage Range 7V to 40V
Output Voltage, VOUT1 VIN = 7V to 40V, IOUT1 = 0A to 3A 5V ± 3%
Output Voltage, VOUT2 VIN = 7V to 40V, IOUT2 = 0A to 3A 3.3V ± 3%
Maximum Output Current, IOUT1 VIN = 7V to 40V, VOUT1 = 5V 3A
Maximum Output Current, IOUT2 VIN = 7V to 40V, VOUT2 = 3.3V 3A
Typical Switching Frequency 1MHz
Typical Efficiency, VOUT1 (5V) VIN = 12V, IOUT1 = 3A 93.2%
Typical Efficiency, VOUT2 (3.3V) VIN = 12V, IOUT2 = 3A 91.3%
BOARD PHOTO
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DEMO MANUAL DC1868A
Rev. 0
QUICK START PROCEDURE
Figure 1. Proper Measurement Equipment Setup
Demonstration circuit 1868A is easy to set up to evaluate the performance of the LTM8024. 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 VIN1 (7V – 40V) and GND (input return).
2. Connect the 5V output load between VOUT1 and GND (Initial load: no load); and connect the 3.3V output load between VOUT2 and GND (Initial load: no load).
3. Connect the DVMs to the input and outputs.
4. Turn on the input power supply and check for the proper output voltages. VOUT1 should be 5V ± 3%; VOUT2 should be 3.3V ± 3%.
5. Once the proper output voltages are established, adjust the loads within the operating range and observe the output voltage regulation, efficiency 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.
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DEMO MANUAL DC1868A
Rev. 0
QUICK START PROCEDURE
+ –
VOUT GND
COUT
Figure 2. Measuring Output Voltage Ripple
LOAD CURRENT (A)0.01 0.10 1.0 10.0
60
65
70
75
80
85
90
95
100
EFFI
CIEN
CY (%
)
DC1868A F03
12VIN BM – CH2 OFF24VIN BM – CH2 OFF36VIN BM – CH2 OFF
LOAD CURRENT (A)0.01 0.10 1.0 10.0
60
65
70
75
80
85
90
95
100
EFFI
CIEN
CY (%
)
DC1868A F04
12VIN BM – CH1 OFF24VIN BM – CH1 OFF36VIN BM – CH1 OFF
Figure 3. 5V Efficiency vs Load Current (Burst Mode Operation, 1MHz, Channel 2 Off)
Figure 4. 3.3V Efficiency vs Load Current (Burst Mode Operation, 1MHz, Channel 1 Off)
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DEMO MANUAL DC1868A
Rev. 0
Figure 5. Output Voltage Ripples (12VIN, 3.5A Load on Each Output, Discontinuous Mode)
Figure 6. Load Step Transient Test (VIN = 12V, VOUT1 = 5V)
QUICK START PROCEDURE
5V (AC) (5mV/DIV)
3.3V (AC) (5mV/DIV)
VOUT1 200mV/DIV,
AC-COUPLED
1.75A LOAD STEP,
1A/DIV
(TOTAL IOUT1 1.75A TO/FROM 3.5A)
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DEMO MANUAL DC1868A
Rev. 0
Figure 7. Load Step Transient Test (VIN = 12V, VOUT2 = 3.3V)
QUICK START PROCEDURE
Figure 8. CISPR22 Class B Emissions DC1868A Demo Board Spread Spectrum On, No EMI Filter, (C20 = 0.1µF, L1, FB1 Short), (C21, C22, C34-C37 Open)
VOUT2 200mV/DIV,
AC-COUPLED
1.75A LOAD STEP,
1A/DIV
(TOTAL IOUT2 1.75A TO/FROM 3.5A)
Class B LimitCLASS B LIMIT
FREQUENCY (MHz)0 200 400 600 800 1000
–10
0
10
20
30
40
50
60
AMPL
ITUD
E (d
BµV/
m)
DC1868A F08
5VOUT AT 3A, 3.3VOUT AT 3A14VIN, fSW = 1MHz
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DEMO MANUAL DC1868A
Rev. 0
PARTS LISTITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 2 C1, C38 CAP., 22μF, ALUM, 63V SUN ELECT., 63CE22BS
2 2 C2, C8 CAP., 4.7μF, X5R, 50V, 20%, 1210 TAIYO YUDEN, UMK325BJ475MM-T
3 2 C3, C7 CAP., 100μF, X5R,10V, 20%, 1210 TAIYO YUDEN, LMK325BJ107MM-T
4 2 C11, C12 CAP., 0.1μF, X7R, 16V, 10%, 0603 MURATA, GRM188R71C104KA01D
5 1 C20 CAP., 1μF, X5R, 50V, 10%, 0603 MURATA, GRM188R61H105KAALD
6 2 C21, C22 CAP., 10μF, X7R, 50V, 10% 1210 MURATA, GRM32ER71H106KA12L
7 4 C34, C35, C36, C37 CAP., 0.1μF, X7R, 50V, 10%, 0402 MURATA, GCM155R71H104KE02D
8 1 FB1 FERRITE BEAD WURTH ELEKTRONIK, 74279226101
9 1 L3 INDUCTOR, 0.22μH WURTH ELEKTRONIK, 744373240022
10 2 R2, R4 RES., CHIP, 100k, 0.1W ,1%, 0603 VISHAY, CRCW0603100KFKEA
11 1 R7 RES., CHIP, 47.5k, 0.1W,1%, 0603 VISHAY, CRCW060347K5FKEA
12 1 R9 RES/JUMPER, CHIP, 0Ω, 0.1W, 0603 VISHAY, CRCW06030000Z0EA
13 1 R10 RES., CHIP, 78.7k, 0.1W, 1%, 0603 VISHAY, CRCW060378K7FKEA
14 1 R11 RES., CHIP, 35.7k, 0.1W, 1%, 0603 VISHAY, CRCW060335K7FKEA
15 2 R21, R22 RES., CHIP, 1M, 0.1W, 1%, 0603 VISHAY, CRCW06031M00FKEA
16 1 R26 RES/JUMPER, CHIP, 0Ω, 0.1W, 0805 VISHAY, CRCW08050000Z0EA
17 1 U1 I.C., DUAL 40VIN, 3A μModule REG ANALOG DEVICES, LTM8024EY #PBF
Additional Demo Board Circuit Components
1 0 C4, C5, C9, C10, C17 (OPT) CAP., OPT, 0603
2 0 R6, R19, R23, R20, R24, R25 (OPT) RES., OPT, 0603
Hardware for Demo Board Only
1 23 E1–E23 TEST POINT, TURRET, .094" PBF MILL MAX, 2501-2-00-80-00-00-07-0
2 1 JP1 HEADERS, 3 PINS, 2mm CTRS. SAMTEC, TMM-103-02-L-S
3 1 XJP1 SHUNT, 2mm CTRS. SAMTEC, 2SN-BK-G
4 4 MH1–MH4 STANDOFF, NYLON, 0.25" KEYSTONE, 8831 (SNAP ON)
5 1 FAB, PRINTED CIRCUIT BOARD ANALOG DEVICES, DEMO CIRCUIT 1868A
6 2 STENCILS FOR BOTH SIDES ANALOG DEVICES, STENCIL DC1868A
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DEMO MANUAL DC1868A
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
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47.5
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R11
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R23
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TR
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1B
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TR
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GNDA1
GNDA5
GNDB5
GNDC4
GNDC5
GNDD2
GNDD3
GNDD4
GNDD5
GNDD6
GNDE2
GNDE3
GNDE4
GNDE5
GNDE6
GNDF8
GNDF2
GNDF3
GNDF4
GNDF5
GNDF6
GNDF7
GNDH2
GNDH3
GNDH4
GNDH5
GNDH6
GNDJ2
GNDJ3
GNDJ4
GNDJ5
GNDL1GNDK5
GNDL5
TE
MP
L2
CLK
OU
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4
FB
2A
2
FB
1A
3
PG
2K
3
PG
1L
3
VO
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2J6
VO
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2J7
VO
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2J8
VO
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2K
6
VO
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2K
7
VO
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2K
8
VO
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2L
6
VO
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2L
7
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2L
8
AU
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B4
BIA
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4
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B3
VO
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1A
6
VO
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1A
7
VO
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1A
8
VO
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1B
6
VO
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1B
7
VO
UT
1B
8
VO
UT
1C
6
VO
UT
1C
7
GNDG2
GNDG3
GNDG4
GNDG5
GNDG6
RT
C1
VO
UT
1C
8
GNDD7
GNDD8
GNDE7
GNDE8
GNDH7
GNDH8
GNDG7
GNDG8
C5
(OP
T)
R25
OP
T
R19
(OP
T)
E21
C9
(OP
T)
TP
3
FB
1
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E13
C3
100uF
10V
1210
C35
50
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FB
1
74279226101
R9
0 O
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E7
8
DEMO MANUAL DC1868A
Rev. 0
ANALOG DEVICES, INC. 2019
12/19www.analog.com
ESD Caution ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality.
Legal Terms and Conditions By using the evaluation board discussed herein (together with any tools, components documentation or support materials, the “Evaluation Board”), you are agreeing to be bound by the terms and conditions set forth below (“Agreement”) unless you have purchased the Evaluation Board, in which case the Analog Devices Standard Terms and Conditions of Sale shall govern. Do not use the Evaluation Board until you have read and agreed to the Agreement. Your use of the Evaluation Board shall signify your acceptance of the Agreement. This Agreement is made by and between you (“Customer”) and Analog Devices, Inc. (“ADI”), with its principal place of business at One Technology Way, Norwood, MA 02062, USA. Subject to the terms and conditions of the Agreement, ADI hereby grants to Customer a free, limited, personal, temporary, non-exclusive, non-sublicensable, non-transferable license to use the Evaluation Board FOR EVALUATION PURPOSES ONLY. Customer understands and agrees that the Evaluation Board is provided for the sole and exclusive purpose referenced above, and agrees not to use the Evaluation Board for any other purpose. Furthermore, the license granted is expressly made subject to the following additional limitations: Customer shall not (i) rent, lease, display, sell, transfer, assign, sublicense, or distribute the Evaluation Board; and (ii) permit any Third Party to access the Evaluation Board. As used herein, the term “Third Party” includes any entity other than ADI, Customer, their employees, affiliates and in-house consultants. The Evaluation Board is NOT sold to Customer; all rights not expressly granted herein, including ownership of the Evaluation Board, are reserved by ADI. CONFIDENTIALITY. This Agreement and the Evaluation Board shall all be considered the confidential and proprietary information of ADI. Customer may not disclose or transfer any portion of the Evaluation Board to any other party for any reason. Upon discontinuation of use of the Evaluation Board or termination of this Agreement, Customer agrees to promptly return the Evaluation Board to ADI. ADDITIONAL RESTRICTIONS. Customer may not disassemble, decompile or reverse engineer chips on the Evaluation Board. Customer shall inform ADI of any occurred damages or any modifications or alterations it makes to the Evaluation Board, including but not limited to soldering or any other activity that affects the material content of the Evaluation Board. Modifications to the Evaluation Board must comply with applicable law, including but not limited to the RoHS Directive. TERMINATION. ADI may terminate this Agreement at any time upon giving written notice to Customer. Customer agrees to return to ADI the Evaluation Board at that time. LIMITATION OF LIABILITY. THE EVALUATION BOARD PROVIDED HEREUNDER IS PROVIDED “AS IS” AND ADI MAKES NO WARRANTIES OR REPRESENTATIONS OF ANY KIND WITH RESPECT TO IT. ADI SPECIFICALLY DISCLAIMS ANY REPRESENTATIONS, ENDORSEMENTS, GUARANTEES, OR WARRANTIES, EXPRESS OR IMPLIED, RELATED TO THE EVALUATION BOARD INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTY OF MERCHANTABILITY, TITLE, FITNESS FOR A PARTICULAR PURPOSE OR NONINFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS. IN NO EVENT WILL ADI AND ITS LICENSORS BE LIABLE FOR ANY INCIDENTAL, SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES RESULTING FROM CUSTOMER’S POSSESSION OR USE OF THE EVALUATION BOARD, INCLUDING BUT NOT LIMITED TO LOST PROFITS, DELAY COSTS, LABOR COSTS OR LOSS OF GOODWILL. ADI’S TOTAL LIABILITY FROM ANY AND ALL CAUSES SHALL BE LIMITED TO THE AMOUNT OF ONE HUNDRED US DOLLARS ($100.00). EXPORT. Customer agrees that it will not directly or indirectly export the Evaluation Board to another country, and that it will comply with all applicable United States federal laws and regulations relating to exports. GOVERNING LAW. This Agreement shall be governed by and construed in accordance with the substantive laws of the Commonwealth of Massachusetts (excluding conflict of law rules). Any legal action regarding this Agreement will be heard in the state or federal courts having jurisdiction in Suffolk County, Massachusetts, and Customer hereby submits to the personal jurisdiction and venue of such courts. The United Nations Convention on Contracts for the International Sale of Goods shall not apply to this Agreement and is expressly disclaimed.
