C3225X5R1C226M [NSC]
LMZ1050xEXT Evaluation Board; LMZ1050xEXT评估板
| 型号： | C3225X5R1C226M |
| 厂家： | 
National Semiconductor |
| 描述： | LMZ1050xEXT Evaluation Board |
| 文件： | 总12页 (文件大小：1354K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
National Semiconductor
Application Note 2074
Yang Zhang
LMZ1050xEXT Evaluation
Board
August 16, 2010
Introduction
Evaluation Board Design Concept
The LMZ1050xEXT SIMPLE SWITCHER® power module is
a complete, easy-to-use DC-DC solution capable of driving
up to 3A, 4A, or 5A load with exceptional power conversion
efficiency, output voltage accuracy, line and load regulation.
The LMZ1050xEXT is available in an innovative package that
enhances thermal performance and allows for hand or ma-
chine soldering.
The evaluation board is designed to demonstrate low con-
ducted noise on the input and output lines, as seen in Figure
11 and Figure 14. Four input capacitors (Cin1 - C in4) and three
output capacitors (Co1 - Co3) are populated for this purpose.
All the input and output filter capacitors are not necessary to
comply with radiation standards. For a circuit example that
passes radiated emissions standards (EN55022, class B)
please refer to Figure 19. Additionally, Cin5 is present to re-
duce the resonance of the input line produced by the induc-
tance and resistance in the cables connecting the bench
power supply to the evaluation board and the input capacitors.
The LMZ1050xEXT can accept an input voltage rail between
2.95V and 5.5V and deliver an adjustable and highly accurate
output voltage as low as 0.8V. One megahertz fixed frequen-
cy PWM switching provides a predictable EMI characteristic.
Two external compensation components can be adjusted to
set the fastest response time, while allowing the option to use
ceramic and/or electrolytic output capacitors. Externally pro-
grammable soft-start capacitor facilitates controlled startup.
The LMZ1050xEXT is a reliable and robust solution with the
following features: lossless cycle-by-cycle peak current limit
to protect for over current or short-circuit fault, thermal shut-
down, input under-voltage lock-out, and pre-biased startup.
Additional Component Footprints
When the tracking feature of the LMZ1050xEXT is used, re-
move the soft-start capacitor CSS and use a resistor divider
on designators Rtrkb and Rtrkt. The ground and Vtrk post have
been provided for easy connection.
The LMZ1050xEXT eval board incorporates a precision en-
able circuit which is pulled high by a 100 kΩ pull up resistor
to VIN. This allows the user to pull low on the enable pin to
ground. The top enable resistor is Rent and the bottom enable
resistor is Renb. Refer to the Design Guideline and Operating
Description section of the LMZ1050xEXT data sheet for de-
tailed design implementation.
Board Specifications
•
•
VIN = 2.95V to 5.5V
VOUT = 2.5V (default output voltage setting, refer to Table
2 for other output settings)
Select FPGAs specify input inrush currents for particular pow-
er-up sequences and others require sequencing rails to avoid
start-up or latch-up problems. To prevent early turn-on of the
LMZ1050xEXT in systems with multiple power rails, precision
enable and tracking are useful as the main input voltage rail
rises at power-up.
•
±2.5% feedback voltage accuracy at 2.5V output
(Including line and load regulation from TJ = -55°C to
125°C)
±1.63% feedback voltage accuracy over temperature
IOUT = 0A to 3A, 4A, and 5A
•
•
•
•
θ
JA = 20°C/W, θJC = 1.9°C/W
Designed on four layers, the top and bottom layers are
1oz. copper and the two inner layers are 1/2 oz. copper
weight
•
Measures 2.25 in. x 2.25 in. (5.8 cm x 5.8 cm) and is 62mil
(.062”) thick on a FR4 laminate
© 2010 National Semiconductor Corporation
301280
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Component Circuit Schematic
30128017
FIGURE 1. Component Schematic for Evaluation Board
TABLE 1. Bill of Materials for Evaluation Board, VIN = 3.3V to 5V, VOUT = 2.5V
Designator
Description
Case Size
Manufacturer
Manufacturer P/N
Quantity
U1
SIMPLE SWITCHER®
TO-PMOD-7
National
LMZ10503/4/5EXTTZ
1
Semiconductor
Cin1
Cin2, CO1
Cin3, CO2
Cin4
1 µF, X7R, 16V
4.7 µF, X5R, 6.3V
22 µF, X5R, 16V
47 µF, X5R, 6.3V
100 µF, X5R, 6.3V
0805
0805
1210
1210
1812
0805
0805
0805
0603
0805
0805
TDK
TDK
C2012X7R1C105K
C2012X5R0J475K
1
2
2
1
1
1
1
1
1
1
1
TDK
C3225X5R1C226M
C3225X5R0J476M
C4532X5R0J107M
CRCW080575K0FKEA
CRCW080534K8FKEA
CRCW08051K10FKEA
C1608C0G1H181J
CRCW0805100KFKEA
C2012C0G1H103J
TDK
CO3
TDK
Rfbt
Vishay Dale
Vishay Dale
Vishay Dale
TDK
75 kΩ
34.8 kΩ
Rfbb
Rcomp
Ccomp
Ren1
1.1 kΩ
180 pF, ±5%, C0G, 50V
Vishay Dale
TDK
100 kΩ
10 nF, ±5%, C0G, 50V
CSS
TABLE 2. Output Voltage Setting (Rfbt = 75 kΩ)
VOUT
3.3 V
2.5 V
1.8 V
1.5 V
1.2 V
0.9 V
Rfbb
23.7 kΩ
34.8 kΩ
59 kΩ
84.5 kΩ
150 kΩ
590 kΩ
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2
Complete Circuit Schematic
30128024
FIGURE 2. Complete Evaluation Board Schematic
3
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Connection Diagram
30128015
FIGURE 3. Efficiency Measurement Setup
30128016
FIGURE 4. Output Voltage Ripple Measurement Setup
Efficiency vs. Load Current
LMZ10504EXT & LMZ10505EXT, VOUT = 2.5V, TAMB = 25°C
Efficiency vs. Load Current
LMZ10503EXT, VOUT = 2.5V, TAMB = 25°C
30128028
30128031
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4
Performance Characteristics
30128029
30128030
FIGURE 5. Current Derating vs. Ambient Temperature
FIGURE 8. Current Derating vs. Ambient Temperature
LMZ10503EXT, VIN = 5.0V, θJA = 20°C/W
LMZ10503EXT, VIN = 3.3V, θJA = 20°C/W
30128022
30128023
FIGURE 6. Current Derating vs. Ambient Temperature
FIGURE 9. Current Derating vs. Ambient Temperature
LMZ10504EXT, VIN = 5.0V, θJA = 20°C/W
LMZ10504EXT, VIN = 3.3V, θJA = 20°C/W
30128032
30128033
FIGURE 7. Current Derating vs. Ambient Temperature
FIGURE 10. Current Derating vs. Ambient Temperature
LMZ10505EXT, VIN = 5.0V, θJA = 20°C/W
LMZ10505EXT, VIN = 3.3V, θJA = 20°C/W
5
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30128018
30128020
FIGURE 11. Output Voltage Ripple
VIN = 5V, VOUT = 2.5V, IOUT = 3A, 4A, & 5A
LMZ10503EXT / LMZ10504EXT / LMZ10505EXT
FIGURE 14. Output Voltage Ripple
VIN = 3.3V, VOUT = 2.5V, IOUT = 3A, 4A, & 5A
LMZ10503EXT / LMZ10504EXT / LMZ10505EXT
30128037
30128036
FIGURE 12. Load Transient Response
VIN = 5.0V, VOUT = 2.5V
LMZ10503EXT, IOUT = 400 mA to 2.7A, 20 MHz Bandwidth
Limit
FIGURE 15. Load Transient Response
VIN = 3.3V, VOUT = 2.5V
LMZ10503EXT, IOUT = 300 mA to 2.7A, 20 MHz Bandwidth
Limit
30128019
30128021
FIGURE 13. Load Transient Response
VIN = 5V, VOUT = 2.5V
LMZ10504EXT, IOUT = 400 mA to 3.6A, 20 MHz Bandwidth
Limit
FIGURE 16. Load Transient Response
VIN = 3.3V, VOUT = 2.5V
LMZ10504EXT, IOUT = 400 mA to 3.6A, 20 MHz Bandwidth
Limit
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6
30128034
30128035
FIGURE 18. Load Transient Response
VIN = 3.3V, VOUT = 2.5V
LMZ10505EXT, IOUT = 500 mA to 4.5A, 20 MHz Bandwidth
Limit
FIGURE 17. Load Transient Response
VIN = 5.0V, VOUT = 2.5V
LMZ10505EXT, IOUT = 500 mA to 4.5A, 20 MHz Bandwidth
Limit
7
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Circuit Example: Complies with EN55022 Class B Radiated Emissions
30128025
FIGURE 19. Component Schematic, VIN = 5V, VOUT = 2.5V, Complies with EN55022 Class B Radiated Emissions
TABLE 3. Bill of Materials
Designator
Description
Case Size
Manufacturer
Manufacturer P/N
Quantity
U1
SIMPLE SWITCHER®
TO-PMOD-7
National
LMZ10503/4/5EXTTZ
1
Semiconductor
Cin1
Cin2
1 µF, X7R, 16V
4.7 µF, X5R, 6.3V
47 µF, X5R, 6.3V
100 µF, X5R, 6.3V
0805
0805
1210
1812
0805
0805
0805
0603
0805
TDK
TDK
C2012X7R1C105K
C2012X5R0J475K
1
1
1
1
1
1
1
1
1
Cin3
TDK
C3225X5R0J476M
C4532X5R0J107M
CRCW080575K0FKEA
CRCW080534K8FKEA
CRCW08051K10FKEA
C1608C0G1H181J
C2012C0G1H103J
CO1
TDK
Rfbt
Vishay Dale
Vishay Dale
Vishay Dale
TDK
75 kΩ
34.8 kΩ
Rfbb
Rcomp
Ccomp
CSS
1.1 kΩ
180 pF, ±5%, C0G, 50V
10 nF, ±5%, C0G, 50V
TDK
30128038
30128026
FIGURE 20. Radiated Emissions (EN55022, Class B)
VIN = 5V, VOUT = 2.5V, IOUT = 3A
FIGURE 21. Radiated Emissions (EN55022, Class B)
VIN = 5V, VOUT = 2.5V, IOUT = 4A
Tested on LMZ10503EXT Evaluation Board
Tested on LMZ10504EXT Evaluation Board
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8
30128027
FIGURE 22. Radiated Emissions (EN55022, Class B)
VIN = 5V, VOUT = 2.5V, IOUT = 5A
Tested on LMZ10505EXT Evaluation Board
9
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PCB Layout Diagram
30128007
FIGURE 23. Top Layer
30128008
FIGURE 24. Internal Layer I (Ground)
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10
30128011
FIGURE 25. Internal Layer II (Ground)
30128013
FIGURE 26. Bottom Layer
11
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