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(R)
Using the EL7515 Demo Board
Technical Brief June 7, 2004 TB429
The complete schematic of EL7515 demo board is shown in Figure 1. With different components stuffed, this demo board can easily be configured into the applications shown in this technical brief. The standard demo board being sent out is the complete 5V to 12V converter shown in Figure 2, which occupies less than 0.4 in2 area with components on top side only. Layout diagrams are given at the end of this document. 1. VIN = 2V-5.5V. Can be higher with higher voltage rated C1 2. VO = 12V. Can be set according to the following formula:
R 2 V O = V FB x 1 + ------ R 1
3. IO - up to 600mA depending on input voltage, provided that diode and inductor can handle the corresponding currents (refer to data sheet for the chart) 4. Switching frequency - can be set by R3 5. R4 can be 10 - 51 if VO is less than 10V. If VO is larger than 12V, it can be calculated by:
V O - 10 R 4 = -------------------I DD
where IDD is a function of switching frequency, as shown in the IDD vs FS curve.
where VFB is shown in the VFB vs VDD curve.
C21 VO4 D21 C14 VO3 D12 C11 VO2 D11 L1 VIN C1 1 PGND 2 SGND R3 R6 R7 5 LBI R8 LBO 6 LBO EN 4 EN SS 7 3 RT LX 10 VDD 9 FB 8 C3 R1 C7 C4 R2 R9 R4 C5 C6 C8 D1 C12 C13 VO1 Q1 L2 VO11 C15 C22
FIGURE 1. COMPLETE SCHEMATIC OF EL7515 DEMO BOARD
L1 VIN C1 1 PGND R6 R3 2 SGND 3 RT 4 EN 5 LBI LX 10 VDD 9 FB 8 C3 SS 7 LBO 6 R1 C10 C4 R2 R4 C5 C6 D1 VO1
FIGURE 2. 5V TO 12V CONVERTER
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright (c) Intersil Americas Inc. 2004. All Rights Reserved. Elantec is a registered trademark of Elantec Semiconductor, Inc. All other trademarks mentioned are the property of their respective owners.
Technical Brief 429 EL7515 Bill of Materials for VO=12V (Figure 2)
FS = 670kHz REFERENCE DESIGNATOR R1 R2 R3 R4 R6 C1 C3 C4 C5 C6 C10 L1 D1 VALUE 10k/1%, 0603 82.5k/1%, 0603 100k, 0603 1k, 0603 0 10F,16V, 1206 20nF, 0603 0.1F/16V, 0805 22F, 16V, 1812 0.1F/16V, 0805 10nF, 0603 10H MBR0520 MANUFACTURER Any Any Any Any Any Murata Any Any TDK Any Any Coilcraft On Semiconductor 847-639-6400 800-282-9855 DO1608C-103 MBR0520 C4532X5R1C226M 1-770-436-1300 GRM31CR61106KC31B MANUFACTURER'S PHONE NUMBER MANUFACTURER'S PART NUMBER
EL7515 Bill of Materials for VO=18V (Figure 2)
FS = 1.2MHz REFERENCE DESIGNATOR R1 R2 R3 R4 R6 C1 C3 C4 C5 C6 C10 L1 D1 VALUE 10k/1%, 0603 124k 47.5k 2.26k 0 10F, 16V, 1206 20nF, 0603 0.1F/16V, 0805 22F, 16V, 1812 0.1F/16V, 0805 10nF 6.8H MBR0520 MANUFACTURER Any Any Any Any Any Murata Any Any TDK Any Any Coilcraft On Semiconductor 847-639-6400 800-282-9855 DO1608C-682 MBR0520 C4532X5R1C226M 1-770-436-1300 GRM31CR61106KC31B MANUFACTURER'S PHONE NUMBER MANUFACTURER'S PART NUMBER
2
Technical Brief 429
L1 VIN (2.3V-3.7V) C1 1 PGND 2 SGND R3 R6 R7 5 LBI R8 LBO 6 3 RT 4 EN LX 10 VDD 9 FB 8
D1 R4 R5
Q1
L2 VO11 (4V, 400mA)
C5
C6
C4 R2 C3 R1 C10
SS 7
FIGURE 3. EL7515 WITH OUTPUT DISCONNECT
Disconnect voltage at:
R 7 V IN = 0.22 x 1 + ------ R 8
EL7515 Bill of Materials for VO=4V (Figure 3)
FS = 670kHz REFERENCE DESIGNATOR R1, R5, R8 R2 R3 R4 R6 R7 C1 C3 C4 C5 VALUE 10k/1%, 0603 20k/1%, 0603 100k, 0603 51, 0603 0 56.2k 10F, 16V, 1206 20nF, 0603 0.1F/16V, 0805 330F 100F 0.1F/16V, 0805 10nF, 0603 10H 0 MBR0520 IRLML6402 MANUFACTURER Any Any Any Any Any Any Murata Any Any Vishay/Sprague Murata Any Any Coilcraft Any On Semiconductor IR 800-282-9855 MBR0520 IRLML6402 847-639-6400 DO1608C-103 207-324-4140 1-770-436-1300 293D476X-020D20 GRM43SR60J107M***B 1-770-436-1300 GRM31CR61106KC31B MANUFACTURER'S PHONE NUMBER MANUFACTURER'S PART NUMBER
C6 C10 L1 L2 D1 Q1
3
Technical Brief 429
D11
D12 VO3 (14.5V)
L1 VIN (2.7V4.2V) C1 1 PGND 2 SGND R3 R6 3 RT 4 EN 5 LBI
C14
C11 D 1 R4
C13 VO1 (5.1V) C5 C6
C15
LX 10 VDD 9 FB 8 C3 SS 7 LBO 6 R1 C4 R2
C10
FIGURE 4. EL7515 WITH DUAL OUTPUTS
EL7515 Bill of Materials (Figure 4)
VO1 = 5.1V, VO3 = 14.5V, FS = 670kHz REFERENCE DESIGNATOR R1 R2 R3 R4 R6 C1 C3 C4, C6, C11, C14 C5 C10 C13 C15 L1 D1 D2, D3 VALUE 133k/1% 402k/1% 100k 51 0 10F, 16V, 1206 20nF 0.1F/16V 22F, 10V, 1210 10nF, 0603 1F 4.7F 10H MBR0520 BAT54S MANUFACTURER Any Any Any Any Any Murata Any Any Murata Any Any Panasonic Coilcraft On Semiconductor Vishay/Telefunken 408-945-5660 847-639-6400 800-282-9855 402-563-6866 ECJ-3YF1C4752 DO1608C-103 MBR0520 BAT54S 1-770-436-1300 GRM32ER61A226KA65B 1-770-436-1300 GRM31CR61106KC31B MANUFACTURER'S PHONE NUMBER MANUFACTURER'S PART NUMBER
4
Technical Brief 429
C21 D21 C11 D11 L1 VIN C1 1 PGND 2 SGND R3 R6 3 RT 4 EN 5 LBI LX 10 VDD 9 FB 8 C3 SS 7 LBO 6 R1 C10 C4 R2 R4 C5 C6 D1 VO1 (10V) VO2 (19.5V) C12 VO4 (~9.5V) C22
FIGURE 5. EL7515 FOR TRIPLE OUTPUT
EL7515 Triple Output Bill of Materials (Figure 5)
VO1 = 10V, VO2 = 19.5V, VO4 = -9.5V REFERENCE DESIGNATOR R1 R2 R3 R4 R6 C1 C3 C4, C6, C11, C21 C5 C10 C12, C22 L1 D1 D11, D21 VALUE 10k/1%, 0603 66.5k/1%, 0603 100k, 0603 51, 0603 0 10F, 16V, 1206 20nF, 0603 0.1F/16V, 0805 22F, 16V, 1812 10nF, 0603 4.7F, 25V 10H MBR0520 BAT54S MANUFACTURER Any Any Any Any Any Murata Any Any TDK Any Panasonic Coilcraft On Semiconductor Vishay/Telefunken 408-945-5660 847-639-6400 800-282-9855 402-563-6866 ECJ-3YF1C4752 DO1608C-153 MBR0520 BAT54S C4532X5R1C226M 1-770-436-1300 GRM31CR61106KC31B MANUFACTURER'S PHONE NUMBER MANUFACTURER'S PART NUMBER
5
Technical Brief 429 Typical Performance Curves
1.355 1.35 1.345 VFB 1.34 1.335 1.33 1.325 1.32 5 6 7 8 VDD 9 10 11 12 IDD (mA) 3.6 3.4 3.2 3 2.8 2.6 2.4 2.2 2 650 750 850 950 FS (kHz) 1050 1150 1250 VDD=10V VO=12V-18V
FIGURE 6. VFB vs VDD
FIGURE 7. IDD vs FS
6
Technical Brief 429 Demo Board Layout
2000 mil
2000 mil
FIGURE 8. TOP LAYER
2 in
2 in
FIGURE 9. TOP SILKSCREEN
2000 mil
2000 mil
FIGURE 10. BOTTOM LAYER
Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that the Application Note or Technical Brief is current before proceeding.
For information regarding Intersil Corporation and its products, see www.intersil.com 7

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