LMZ14202EXTTZ [NSC]
LMZ1420xEXT/ LMZ1200xEXT Evaluation Board; LMZ1420xEXT / LMZ1200xEXT评估板
| 型号： | LMZ14202EXTTZ |
| 厂家： | 
National Semiconductor |
| 描述： | LMZ1420xEXT/ LMZ1200xEXT Evaluation Board |
| 文件： | 总10页 (文件大小：741K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
National Semiconductor
Application Note 2084
Alan Martin
LMZ1420xEXT /
LMZ1200xEXT Evaluation
Board
August 16, 2010
Introduction
Board Specifications
The LMZ1420xEXT and LMZ1200xEXT SIMPLE SWITCH-
ER® power modules are easy-to-use DC-DC solution capa-
ble of driving up to a 3A load with exceptional power
conversion efficiency, output voltage accuracy, line and load
regulation. They are available in an innovative package that
enhances thermal performance and allows for hand or ma-
chine soldering.
•
•
•
•
•
•
•
•
•
LMZ1420xEXT VIN = 6V to 42V
LMZ1420xEXT enable UVLO = 8V
LMZ1420xEXT VOUT = 3.3V
LMZ1200xEXT VIN = 4.5V to 20V
LMZ1200xEXT enable UVLO = 4.5V
LMZ1200xEXT VOUT = 1.8V
Operates at full load up to 80°C ambient at 12V input
The LMZ14203EXT/2EXT/1EXT can accept an input voltage
rail between 6V and 42V and the LMZ12003EXT/2EXT/1EXT
can accept an input voltage rail between 4.5V and 20V. The
devices can deliver an adjustable and highly accurate output
voltage as low as 0.8V and as high as 6V. The control struc-
ture is constant on-time with input voltage feed forward. This
creates a nearly constant switching frequency across the in-
put voltage range. The control loop operates well with low
ESR output capacitors such as ceramics. An output feed-for-
ward capacitor across the upper feedback resistor trims for
optimum transient response. The precision enable input al-
lows for programmable UVLO of the input supply. The exter-
nal soft-start capacitor facilitates controlled startup output rise
time. The LMZ1420xEXT and LMZ1200xEXT family is a reli-
able and robust solution with the following features: lossless
cycle-by-cycle valley current limit to protect for over current
or short-circuit fault, thermal shutdown, input under-voltage
lock-out, and will start up into a pre-biased output. The
LMZ1420xEXT and LMZ1200xEXT families are shock and
vibration certified and rated for operation down to –55°C.
θ
JA = 20°C / W, θJC = 1.9°C / W
Designed on four layers, all four layers are 1 oz. copper
weight
•
•
The two internal ground planes are identical
Measures 1.705 in. x 3.03 in. (4.33 cm x 7.7cm) and is
62mil (.062”) thick of FR4 laminate material
For additional circuit modifications refer to the Design Con-
sideration section of the LMZ1420xEXT or LMZ1200xEXT
data sheet. For negative output voltage connections see
AN-2027.
Additional Footprints
Additional component mounting pads are available to exper-
iment with alternative Cin and Cout combinations or a zener
clamp on the enable input. See Figure 6 for corresponding
schematic locations.
30131501
FIGURE 1. Evaluation Board Schematic
(LMZ1200xEXT 1.8V application values shown in parentheses)
© 2010 National Semiconductor Corporation
301315
www.national.com
TABLE 1. LMZ1420xEXT Bill of Materials, VIN = 8V to 42V, VOUT = 3.3V, IOUT (MAX) = 3A / 2A / 1A
Designator
Description
Case Size
Manufacturer
Manufacturer P/N
Quantity
U1
SIMPLE SWITCHER®
TO-PMOD-7
National
Semiconductor
LMZ14203EXTTZ or
LMZ14202EXTTZ or
LMZ14201EXTTZ
1
CIN4, CO1
CIN2
1 µF, X7R, 50V
10 µF, X5R, 50V
100 µF, X5R, 6.3V
0.022 µF, X7R, 100V
11.8k
1206
1210
1210
0805
0805
0805
0805
0805
0805
Taiyo Yuden
Taiyo Yuden
Taiyo Yuden
AVX
UMK316B7105KL-T
UMK325BJ106MM-T
JMK325BJ107MM-T
08051C223JAT2A
ERJ-6ENF1182V
2
1
1
2
1
1
1
1
1
CO2
CSS, CFF
RENB
Panasonic
Panasonic
Vishay-Dale
Panasonic
Panasonic
RENT
ERJ-6ENF6812V
68.1 kΩ
RFBT
CRCW08053K32FKEA
CRCW080534K8FKEA
ERJ-6ENF6192V
3.32 kΩ
RFBB
1.07 kΩ
RON
61.9 kΩ
TABLE 2. LMZ1200xEXT Bill of Materials, VIN = 4.5 to 20V, VOUT = 1.8V, IOUT (MAX) = 3A / 2A / 1A
Designator
Description
Case Size
Manufacturer
Manufacturer P/N
Quantity
U1
SIMPLE SWITCHER®
TO-PMOD-7
National
Semiconductor
LMZ12003EXTTZ or
LMZ12002EXTTZ or
LMZ12001EXTTZ
1
CIN4, CO1
CIN2
1 µF, X7R, 50V
10 µF, X5R, 50V
100 µF, X5R, 6.3V
0.022 µF, X7R, 100V
11.8k
1206
1210
1210
0805
0805
0805
0805
0805
0805
Taiyo Yuden
Taiyo Yuden
Taiyo Yuden
AVX
UMK316B7105KL-T
UMK325BJ106MM-T
JMK325BJ107MM-T
08051C223JAT2A
ERJ-6ENF1182V
2
1
1
2
1
1
1
1
1
CO2
CSS, CFF
RENB
Panasonic
Panasonic
Vishay-Dale
Panasonic
Panasonic
RENT
ERJ-6ENF3242V
32.4KΩ
RFBT
CRCW08051K87FKEA`
CRCW08051K50FKEA
ERJ-6ENF3242V
1.87 kΩ
RFBB
1.50 kΩ
RON
32.4KΩ
Performance Characteristics
LMZ14203EXT Load and Line Regulation
LMZ12003EXT Load and Line Regulation
30131504
30131505
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2
LMZ14203EXT Efficiency
LMZ12003EXT Efficiency
30131502
30131503
LMZ14202EXT Efficiency
LMZ12002EXT Efficiency
30131520
30131521
LMZ14201EXT Efficiency
LMZ12001EXT Efficiency
30131522
30131523
3
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LMZ14203EXT Thermal Derating
LMZ12003EXT Thermal Derating
30131515
30131516
LMZ14202EXT Thermal Derating
LMZ12002EXT Thermal Derating
30131524
30131525
LMZ14201EXT Thermal Derating
LMZ12001EXT Thermal Derating
30131527
30131526
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4
LMZ14203EXT Current Limit VOUT = 3.3V
LMZ12003EXT Current Limit VOUT = 1.8V
30131528
30131529
LMZ14202EXT Current LimitVOUT = 3.3V
LMZ12002EXT Current Limit VOUT = 1.8V
30131530
30131531
LMZ14201EXT Current Limit VOUT = 3.3V
LMZ12001EXT Current Limit VOUT = 1.8V
30131533
30131532
5
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LMZ14203EXT Startup VIN = 12V
LMZ12003EXT Startup VIN = 12V
30131535
30131534
LMZ14203EXT Output Ripple VOUT = 3.3V
IOUT = 3A, BW = 200 MHz
LMZ14203EXT Transient Response VIN = 24V
VOUT = 3.3V, 0.6 A to 3A Step
30131518
30131517
PCB Layout Diagrams
Gerber and CAD files can be download from the LMZ14203EXT product folder.
30131509
FIGURE 2. Top Layer
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6
30131510
FIGURE 3. Internal Layer I (Ground)
Heat Sinking Layer
30131511
FIGURE 4. Internal Layer II (Ground)
Heat Sinking Layer
30131512
FIGURE 5. Bottom Layer (Ground and Routing)
Heat Sinking Layer
7
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30131513
FIGURE 6. LMZ14203EXT PCB CAD package schematic
DNS = Component not installed
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8
Notes
9
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Notes
For more National Semiconductor product information and proven design tools, visit the following Web sites at:
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