XR76203EVB-Q [EXAR]
EVAL BOARD FOR XR76203-Q;
| 型号： | XR76203EVB-Q |
| 厂家： | 
EXAR CORPORATION |
| 描述： | EVAL BOARD FOR XR76203-Q |
| 文件： | 总13页 (文件大小：2007K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
XR76203/5/8
40V, 3/5/8A Synchronous Step Down COT Regulator
February 2015
Rev. 1A
GENERAL DESCRIPTION
EVALUATION BOARD MANUAL
The XR76203, XR76205 and XR76208 are
synchronous step-down regulators combining the
controller, drivers, bootstrap diode and MOSFETs in
a single package for point-of-load supplies. The
XR76203, XR76205 and XR76208 have load current
ratings of 3A, 5A and 8A respectively. A wide5V to
40V input voltage range allows for single supply
operation from industry standard 24V 10%, 18V-
36V, and rectified 18VAC and 24VAC rails.
With a proprietary emulated current mode Constant
On-Time (COT) control scheme, the XR76203,
XR76205 and XR76208 provide extremely fast line
and load transient response using ceramic output
capacitors. They require no loop compensation,
simplifying circuit implementation and reducing
overall component count. The control loop also
provides 0.07% load and 0.15% line regulation and
maintains constant operating frequency. A selectable
power saving mode allows the user to operate in
discontinuous conduction mode (DCM) at light
current loads thereby significantly increasing the
converter efficiency.
FEATURES
• Controller, drivers, bootstrap diode, MOSFETs
integrated in one package
• 3/5/8A Step Down Regulator
−
−
Wide 5V to 40V Input Voltage Range
≥0.6V Adjustable Output Voltage
• Proprietary Constant On-Time Control
A host of protection features, including over-current,
over-temperature, short-circuit and UVLO, helps
achieve safe operation under abnormal operating
conditions.
−
−
−
−
−
No Loop Compensation Required
Ceramic Output Cap. Stable operation
Programmable 200ns-2µs On-Time
Constant 400kHz-600kHz freq.
The XR76203/5/8 are available in a RoHS-compliant,
green/halogen-free space-saving QFN 5x5mm
package.
Selectable CCM or CCM/DCM Operation
• 30-pin 5x5mm QFN package
CSNB
0.56nF RSNB
1 Ohm
CBST
1uF
DZ
MMSZ4685
R3 30.1k
RZ
10k
RBST
0
Ohm
VIN+
24VIN
2-3 --> DCM/CCM
C13
3
2
1
3
2
1
J1
R4 35.7k
C15 C14
C1
C2
C3
C4 T3
T4
1-2 --> CCM
10uF/50V
VIN-
10uF/50V 10uF/50V
SW
RLIM
5.49k
1
2
3
4
5
6
7
22
21
20
19
18
17
16
15
ILIM
PVIN
PVIN
EN/MODE
EN
RON
28k
TON
SS
SW
CSS 47nF
U1
PGND
PGND
PGND
PGND
PGND
XR76208
PGOOD
FB
SS
AGND
PWRGD
FB
VCC
R5
10k
IHLP-5050-01
2.2uH
VOUT+
400kHz, 3.3V @ 0-8A
T1
T2
C7
C8
C5 C6
47uF/10V
C16 C18
C9 C10
C11
C12 C17 C19
SW
47uF/10V 47uF/10V
VOUT-
CIN
0.1uF
C20
0.1uF
PVIN
CFF
0.27nF
R6
OPEN
CVCC
4.7uF
RFF
R1
0
Ohm
9.09k
VCC
FB
FB
R2
2k
AGND
Fig. 1: XR76208 Evaluation Board Schematics
Exar Corporation
48720 Kato Road, Fremont CA 94538, USA
www.exar.com
Tel. +1 510 668-7000 – Fax. +1 510 668-7001
XR76203/5/8
40V, 3/5/8A Synchronous Step Down COT Regulator
PIN ASSIGNMENT
Fig. 2: XR76203/5/8 Pin Assignment
© 2015 Exar Corporation
2/13
Rev. 1A
XR76203/5/8
40V, 3/5/8A Synchronous Step Down COT Regulator
PIN DESCRIPTION
ORDERING INFORMATION
Refer to XR76203/5/8 datasheet and/or www.exar.com for exact and up to date ordering information.
© 2015 Exar Corporation
3/13
Rev. 1A
XR76203/5/8
40V, 3/5/8A Synchronous Step Down COT Regulator
USING THE EVALUATION BOARD
JUMPER J1
If the jumper is set to right side the regulator will
operate in “forced CCM”.
POWERING UP
Connect the VIN+/VIN- with short/thick leads to
power supply. Use test pins T4 and T4 to monitor
VIN+ and VIN- respectively. Connect VOUT+/VOUT-
with short/thick leads to an electronic load. Use test
pins T1 and T2 to monitor VOUT+ and VOUT-
respectively. Apply 24V using the power supply. The
XR76203/5/8EVB should power up and regulate the
output at 3.3V. Input voltage range is from 5V to 40V.
Maximum rated current for XR76203/5/8 is 3/5/8A
respectively.
If the Jumper is set to the left side the regulator will
operate in DCM at light load.
PROGRAMMING THE OUTPUT VOLTAGE
VOUT can be programmed by changing R1 according
to:
ꢄꢅꢆꢇ
ꢀ1 ꢁ ꢀ2 ꢂ ꢃ
ꢈ 1ꢉ
0.6
© 2015 Exar Corporation
4/13
Rev. 1A
XR76203/5/8
40V, 3/5/8A Synchronous Step Down COT Regulator
XR76203 EVALUATION BOARD SCHEMATICS
CBST
RBST
1uF
DZ
MMSZ4685
R3 30.1k
RZ
10k
0 Ohm
VIN+
VIN-
24VIN
2-3 --> DCM/CCM
C13 OPEN
R4 35.7k
3
2
1
3
2
1
J1
C15 C14 C1
10uF/50V
C2
C3
C4
T3
T4
1-2 --> CCM
SW
RLIM
4.02k
1
2
3
4
5
6
7
22
21
20
19
18
17
16
15
ILIM
PVIN
PVIN
EN/MODE
EN
RON
CSS 47nF
28k
TON
SS
SW
U1
PGND
PGND
PGND
PGND
PGND
XR76203
PGOOD
FB
SS
AGND
PWRGD
FB
VCC
R5
10k
WURTH 74437368047
4.7uH
VOUT+
400kHz, 3.3V @ 0-3A
T1
T2
C7
C8
C5 C6 C16 C18 C9
C10 C11 C12 C17 C19
SW
47uF/10V
VOUT-
CIN 0.1uF
C20
0.1uF
CFF
0.22nF
PVIN
R6
OPEN
CVCC 4.7uF
RFF
0 Ohm
R1
9.09k, 0.1%
VCC
FB
FB
R2
2k, 0.1%
AGND
© 2015 Exar Corporation
5/13
Rev. 1A
XR76203/5/8
40V, 3/5/8A Synchronous Step Down COT Regulator
XR76203EVB BILL OF MATERIAL
Reference
Qty.
Manufacturer
Manufacturer
Part Number
Size
Component
Designator
PCB
1
1
1
1
1
1
1
2
1
1
1
1
2
1
1
Exar
Exar
XR76203
XR76203 Evaluation kit
U1
XR76203
40V, 3A COT Regulator
L1
Wurth Elektronik
ON SEMI
MURATA
74437368047
11x10mm
Power Inductor 4.7uH, 7.0A, 15.0 mOhm
Diode Zener 3.6V, 500MW,
DZ
MMSZ4685T1G
SOD-123
1210
C1
GRM32E71H106KA12L
GRM32ER71A476KE15L
GRM21BR71C475KA73L
GRM188R71H104KA93D
GRM188R71C105KA12D
GRM188R71H221KA01D
GRM188R71H473KA61D
ERJ-3EKF9091V
CERAMIC CAP. 10uF, 50V, X7R, 10%
CERAMIC CER, 47uF, 10V, X7R, 10%
CERAMIC CAP , 4.7uF, 16V, X7R, 10%
CERAMIC CAP., 0.1uF, 50V, X7R, 10%
CERAMIC CAP., 1.0 uF, 16V, X7R, 10%
CERAMIC CAP. , 220 pF, 50V, X7R, 10%
CERAMIC CAP. 0.047uF, 50V,X7R,10%
Resistor 9.09K Ohm, 1/10W,1%,SMD
Resistor 10.0K Ohm, 1/10W,1%,SMD
Resistor 30.1K Ohm, 1/10W,1%,SMD
Resistor 35.7K Ohm, 1/10W, 1%, SMD
1210
0805
0603
0603
0603
0603
0603
0603
0603
0603
C8
MURATA
CVCC
CIN, C20
CBST
CFF
MURATA
MURATA
MURATA
MURATA
CSS
R1
MURATA
PANASONIC
PANASONIC
PANASONIC
PANASONIC
R5,RZ
R3
ERJ-3EKF1002V
ERJ-3EKF3012V
R4
ERJ-3EKF3572V
RFF, RBST
R2
RLIM
RON
J1
2
1
1
1
1
PANASONIC
PANASONIC
PANASONIC
PANASONIC
Wurth Elektronik
ERJ-3GEY0R00V
ERA-3YEB202V
ERJ-3EKF4021V
ERJ-3EKF2802V
61300311121
0603
0603
0603
0603
Resistor 0.00 Ohm, Jumper, 1/10W, SMD
Resistor 2.0K Ohm, 1/10W, 0.1%, SMD
Resistor 4.02K Ohm, 1/10W,1%,SMD
Resisrtor 28.0K Ohm, 1/10W,1%, SMD
3-PIN CONNECTOR
VIN+, VOUT+, VIN-,VOUT-
T1,T2,T3,T4,SS,VCC,PWR
GD, AGND, EN_MODE
4
9
Wurth Elektronik
Wurth Elektronik
7471287
CONNECTOR BLADE TERMINAL
SINGLE Test Point Post
61300111121
© 2015 Exar Corporation
6/13
Rev. 1A
XR76203/5/8
40V, 3/5/8A Synchronous Step Down COT Regulator
XR76205 EVALUATION BOARD SCHEMATICS
CSNB
0.33nF
RSNB
10k
1 Ohm
CBST
RBST
1uF
DZ
MMSZ4685
RZ
0 Ohm
VIN+
VIN-
24VIN
2-3 --> DCM/CCM
C13 OPEN
R4 35.7k
R3 30.1k
3
2
1
3
2
1
J1
C15 C14 C1
C2
C3
C4 T3
T4
1-2 --> CCM
10uF/50V 10uF/50V
SW
RLIM
8.06k
1
22
21
20
19
18
17
16
15
ILIM
EN
PVIN
PVIN
EN/MODE
2
3
4
5
6
7
RON
CSS 47nF
29.4k
TON
SS
SW
U1
PGND
PGND
PGND
PGND
PGND
XR76205
PGOOD
FB
SS
AGND
PWRGD
FB
VCC
R5
10k
WURTH 74437368033
3.3uH
VOUT+
400kHz, 3.3V @ 0-5A
T1
T2
C7
C8
C5 C6 C16 C18 C9
C10 C11 C12 C17 C19
SW
47uF/10V47uF/10V
VOUT-
CIN 0.1uF
C20
0.1uF
CFF
0.27nF
PVIN
R6
OPEN
CVCC 4.7uF
RFF
0 Ohm
R1
9.09k, 0.1%
VCC
FB
FB
R2
2k, 0.1%
AGND
© 2015 Exar Corporation
7/13
Rev. 1A
XR76203/5/8
40V, 3/5/8A Synchronous Step Down COT Regulator
XR76205EVB BILL OF MATERIAL
Reference
Designator
PCB
Qty.
Manufacturer
Manufacturer
Part Number
Size
Component
1
1
1
1
2
2
1
2
1
1
1
1
1
2
1
1
2
Exar
Exar
XR76205
XR76205 Evaluation Kit
U1
XR76205
40V, 5A COT Regulator
L1
Wurth Elektronik
ON SEMI
74437368033
11x10mm
SOD-123
1210
Power Inductor 3.3uH, 8.0A, 11.8mOhm
Diode Zener 3.6V, 500MW,
DZ
MMSZ4685T1G
C1, C2
C7, C8
CVCC
CIN, C20
CBST
CFF
MURATA
GRM32E71H106KA12L
GRM32ER71A476KE15L
GRM21BR71C475KA73L
GRM188R71H104KA93D
GRM188R71C105KA12D
GRM188R71H271KA01D
GRM188R71H331KA01D
GRM188R71H473KA61D
ERJ-3EKF9091V
CERAMIC CAP. 10uF, 50V, X7R, 10%
CERAMIC CER, 47uF, 10V, X7R, 10%
CERAMIC CAP , 4.7uF, 16V, X7R, 10%
CERAMIC CAP., 0.1uF, 50V, X7R, 10%
CERAMIC CAP., 1.0 Uf, 16V, X7R, 10%
CERAMIC CAP. , 270 pF, 50V, X7R, 10%
CERAMIC CAP. 0.33 nF, 50V,X7R,10%
CERAMIC CAP. 0.047uF, 50V,X7R,10%
Resistor 9.09K Ohm, 1/10W,1%,SMD
Resistor 10.0K Ohm, 1/10W,1%,SMD
Resistor 30.1K Ohm, 1/10W,1%,SMD
Resistor 35.7K Ohm, 1/10W, 1%, SMD
Resistor 0.00 Ohm, Jumper, 1/10W, SMD
1210
MURATA
MURATA
0805
0603
0603
0603
0603
0603
0603
0603
0603
0603
MURATA
MURATA
MURATA
CSNB
CSS
MURATA
MURATA
R1
PANASONIC
PANASONIC
PANASONIC
PANASONIC
PANASONIC
R5,RZ
R3
ERJ-3EKF1002V
ERJ-3EKF3012V
R4
ERJ-3EKF3572V
RFF, RBST
ERJ-3GEY0R00V
0603
0603
0603
0603
0805
R2
RLIM
RON
RSNB
J1
1
1
1
1
1
PANASONIC
PANASONIC
PANASONIC
PANASONIC
Wurth Elektronik
ERA-3YEB202V
ERJ-3EKF8061V
ERJ-3EKF2942V
ERJ-6RQF1R0V
61300311121
Resistor 2.0K Ohm, 1/10W, 0.1%, SMD
Resistor 8.06K Ohm, 1/10W,1%,SMD
Resisrtor 29.4K Ohm, 1/10W,1%, SMD
Resistor 1.0 Ohm,1/8W,1%,SMD
3-PIN CONNECTOR
VIN+, VOUT+, VIN-,VOUT-
T1,T2,T3,T4,SS,VCC,PWR
GD, AGND, EN_MODE
4
9
Wurth Elektronik
Wurth Elektronik
7471287
CONNECTOR BLADE TERMINAL
SINGLE Test Point Post
61300111121
© 2015 Exar Corporation
8/13
Rev. 1A
XR76203/5/8
40V, 3/5/8A Synchronous Step Down COT Regulator
XR76208 EVALUATION BOARD SCHEMATICS
CSNB
0.56nF RSNB
1 Ohm
CBST
RBST
1uF
DZ
MMSZ4685
R3 30.1k
RZ
10k
0 Ohm
VIN+
VIN-
24VIN
2-3 --> DCM/CCM
C13
3
2
1
3
2
1
J1
R4 35.7k
C15 C14 C1
C2
C3
C4 T3
T4
1-2 --> CCM
10uF/50V
10uF/50V 10uF/50V
SW
RLIM
5.49k
1
2
3
4
5
6
7
22
21
20
19
18
17
16
15
ILIM
PVIN
PVIN
EN/MODE
EN
RON
28k
TON
SS
SW
CSS 47nF
U1
PGND
PGND
PGND
PGND
PGND
XR76208
PGOOD
FB
SS
AGND
PWRGD
FB
VCC
R5
10k
IHLP-5050-01
2.2uH
VOUT+
400kHz, 3.3V @ 0-8A
T1
T2
C7
C8
C5 C6
47uF/10V
C16 C18 C9 C10 C11 C12 C17 C19
SW
47uF/10V47uF/10V
VOUT-
CIN
0.1uF
C20
0.1uF
PVIN
CFF
0.27nF
R6
OPEN
CVCC
4.7uF
RFF
R1
0 Ohm
9.09k
VCC
FB
FB
R2
2k
AGND
© 2015 Exar Corporation
9/13
Rev. 1A
XR76203/5/8
40V, 3/5/8A Synchronous Step Down COT Regulator
XR76208EVB BILL OF MATERIAL
Reference
Designator
PCB
Qty.
Manufacturer
Manufacturer
Part Number
Size
Component
1
1
1
1
3
3
1
2
1
1
1
1
1
2
1
1
Exar
Exar
XR76208
XR76208 Evaluation kit
40V, 8A COT Regulator
U1
XR76208
L1
Vishay
IHLP5050FDER2R2M01
MMSZ4685T1G
12.9x13.2mm
SOD-123
1210
Inductor High Current 2.2uH, 22A, 4.2 mOhm
Diode Zener 3.6V, 500MW,
DZ
ON SEMI
MURATA
MURATA
MURATA
MURATA
MURATA
MURATA
MURATA
MURATA
PANASONIC
PANASONIC
PANASONIC
PANASONIC
C1, C2, C3
C6,C7, C8
CVCC
CIN, C20
CBST
GRM32E71H106KA12L
GRM32ER71A476KE15L
GRM21BR71C475KA73L
GRM188R71H104KA93D
GRM188R71C105KA12D
GRM188R71H271KA01D
GRM188R71H561KA01D
GRM188R71H473KA61D
ERJ-3EKF9091V
CERAMIC CAP. 10uF, 50V, X7R, 10%
CERAMIC CER, 47uF, 10V, X7R, 10%
CERAMIC CAP , 4.7uF, 16V, X7R, 10%
CERAMIC CAP., 0.1uF, 50V, X7R, 10%
CERAMIC CAP., 1.0 Uf, 16V, X7R, 10%
CERAMIC CAP. , 270 pF, 50V, X7R, 10%
CERAMIC CAP. 0.56 nF, 50V,X7R,10%
CERAMIC CAP. 0.047uF, 50V,X7R,10%
Resistor 9.09K Ohm, 1/10W,1%,SMD
Resistor 10.0K Ohm, 1/10W,1%,SMD
Resistor 30.1K Ohm, 1/10W,1%,SMD
Resistor 35.7K Ohm, 1/10W, 1%, SMD
1210
0805
0603
0603
0603
0603
0603
0603
0603
0603
0603
CFF
CSNB
CSS
R1
R5,RZ
R3
ERJ-3EKF1002V
ERJ-3EKF3012V
R4
ERJ-3EKF3572V
RFF, RBST
R2
RLIM
RON
RSNB
J1
2
1
1
1
1
1
PANASONIC
PANASONIC
PANASONIC
PANASONIC
PANASONIC
Wurth Elektronik
ERJ-3GEY0R00V
ERA-3YEB202V
ERJ-3EKF5491V
ERJ-3EKF2802V
ERJ-6RQF1R0V
61300311121
0603
0603
0603
0603
0805
Resistor 0.00 Ohm, Jumper, 1/10W, SMD
Resistor 2.0K Ohm, 1/10W, 0.1%, SMD
Resisrtor 5.49K Ohm, 1/10W,1%, SMD
Resisrtor 28.0K Ohm, 1/10W,1%, SMD
Resistor 1.0 Ohm,1/8W,1%,SMD
3-PIN CONNECTOR
VIN+, VOUT+, VIN-,VOUT-
T1,T2,T3,T4,SS,VCC,PWR
GD, AGND, EN_MODE
4
9
Wurth Elektronik
Wurth Elektronik
7471287
CONNECTOR BLADE TERMINAL
SINGLE Test Point Post
61300111121
© 2015 Exar Corporation
10/13
Rev. 1A
XR76203/5/8
40V, 3/5/8A Synchronous Step Down COT Regulator
EVALUATION BOARD LAYOUT
Fig. 3: Top components
Fig. 4: Bottom components
Fig. 5: Top
Fig. 6: Bottom
© 2015 Exar Corporation
11/13
Rev. 1A
XR76203/5/8
40V, 3/5/8A Synchronous Step Down COT Regulator
Fig. 7: Layer 2, GND 1
Fig. 8: Layer 3, VCC1
Fig. 9: Layer 4, GND 2
Fig. 10: Layer 5, VCC2
© 2015 Exar Corporation
12/13
Rev. 1A
XR76203/5/8
40V, 3/5/8A Synchronous Step Down COT Regulator
DOCUMENT REVISION HISTORY
Revision
Date
Description
02/20/15
Initial release of document
1A
BOARD REVISION HISTORY
Board Revision
Date
Description
02/20/15
Initial release of evaluation board
REV 3.1
FOR FURTHER ASSISTANCE
Email:
customersupport@exar.com
powertechsupport@exar.com
http://www.exar.com/TechDoc/
Exar Technical Documentation:
EXAR CORPORATION
HEADQUARTERS AND
SALES OFFICES
48720 Kato Road
Fremont, CA 94538 – USA
Tel.: +1 (510) 668-7000
Fax: +1 (510) 668-7030
www.exar.com
NOTICE
EXAR Corporation reserves the right to make changes to the products contained in this publication in order to improve design, performance or
reliability. EXAR Corporation assumes no responsibility for the use of any circuits described herein, conveys no license under any patent or
other right, and makes no representation that the circuits are free of patent infringement. Charts and schedules contained herein are only for
illustration purposes and may vary depending upon a user’s specific application. While the information in this publication has been carefully
checked; no responsibility, however, is assumed for inaccuracies.
EXAR Corporation does not recommend the use of any of its products in life support applications where the failure or malfunction of the
product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. Products are
not authorized for use in such applications unless EXAR Corporation receives, in writing, assurances to its satisfaction that: (a) the risk of
injury or damage has been minimized; (b) the user assumes all such risks; (c) potential liability of EXAR Corporation is adequately protected
under the circumstances.
Reproduction, in part or whole, without the prior written consent of EXAR Corporation is prohibited.
© 2015 Exar Corporation
13/13
Rev. 1A
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