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| 型号： | LMZ10505EXTTZX/NOPB |
| 厂商： | National Semiconductor |
| 文件页数： | 11/31页 |
| 文件大小： | 0K |
| 描述： | IC BUCK SYNC ADJ 5A TO-PMOD-7 |
| 产品培训模块： | SIMPLE SWITCHER Power Modules |
| 视频文件： | Power Design Invitational - Another Geek Moment |
| 标准包装： | 500 |
| 系列： | SIMPLE SWITCHER® |
| 类型： | 非隔离（POL） |
| 输出数： | 1 |
| 电压 - 输入（最小）： | 2.95V |
| 电压 - 输入（最大）： | 5.5V |
| Voltage - Output 1： | 0.8 ~ 5 V |
| 电流 - 输出（最大）： | 5A |
| 电源（瓦） - 制造商系列： | 25W |
| 特点： | 带有 UVLO |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-PMOD-7，电源模块 |
| 尺寸/尺寸： | 0.40" L x 0.54" W x 0.18" H（10.2mm x 13.8mm x 4.6mm） |
| 包装： | 带卷 (TR) |
| 工作温度： | -55°C ~ 125°C |
| 效率： | 96% |
| 电源（瓦特）- 最大： | 25W |
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LMZ10505EXT
www.ti.com
SNVS669G – JUNE 2010 – REVISED OCTOBER 2013
(12)
(13)
In this particular design the output capacitance is determined by the load transient requirements.
Table 1 lists some examples of commercially available capacitors that can be used with the LMZ10505EXT.
Table 1. Recommended Output Filter Capacitors
C O (μF)
22
47
47
47
100
100
100
150
330
470
Voltage (V), R ESR (m ? )
6.3, < 5
6.3, < 5
6.3, < 5
10.0, < 5
6.3, < 5
6.3, 50
6.3, 25
6.3, 18
6.3, 18
6.3, 23
Make
Ceramic, X5R
Ceramic, X5R
Ceramic, X5R
Ceramic, X5R
Ceramic, X5R
Tantalum
Organic Polymer
Organic Polymer
Organic Polymer
Niobium Oxide
Manufacturer
TDK
TDK
TDK
TDK
TDK
AVX
Sanyo
Sanyo
Sanyo
AVX
Part Number
C3216X5R0J226M
C3216X5R0J476M
C3225X5R0J476M
C3225X5R1A476M
C3225X5R0J107M
TPSD157M006#0050
6TPE100MPB2
6TPE150MIC2
6TPE330MIL
NOME37M006#0023
Case Size
1206
1206
1210
1210
1210
D, 7.5 x 4.3 x 2.9 mm
B2, 3.5 x 2.8 x 1.9 mm
C2, 6.0 x 3.2 x 1.8 mm
D3L, 7.3 x 4.3 x 2.8 mm
E, 7.3 x 4.3 x 4.1 mm
Output Voltage Setting
A resistor divider network from V OUT to the FB pin determines the desired output voltage as follows:
V OUT = 0.8V x
R fbt + R fbb
R fbb
(14)
R fbt is defined based on the voltage loop requirements and R fbb is then selected for the desired output voltage.
Resistors are normally selected as 0.5% or 1% tolerance. Higher accuracy resistors such as 0.1% are also
available.
The feedback voltage (at V OUT = 2.5V) is accurate to within -2.5% / +2.5% over temperature and over line and
load regulation. Additionally, the LMZ10505EXT contains error nulling circuitry to substantially eliminate the
feedback voltage variation over temperature as well as the long term aging effects of the internal amplifiers. In
addition the zero nulling circuit dramatically reduces the 1/f noise of the bandgap amplifier and reference. The
manifestation of this circuit action is that the duty cycle will have two slightly different but distinct operating points,
each evident every other switching cycle.
Loop Compensation
The LMZ10505EXT preserves flexibility by integrating the control components around the internal error amplifier
while utilizing three small external compensation components from V OUT to FB. An integrated type II (two pole,
one zero) voltage-mode compensation network is featured. To ensure stability, an external resistor and small
value capacitor can be added across the upper feedback resistor as a pole-zero pair to complete a type III (three
pole, two zero) compensation network. The compensation components recommended in Table 2 provide type III
compensation at an optimal control loop performance. The typical phase margin is 45° with a bandwidth of 80
kHz. Calculated output capacitance values not listed in Table 2 should be verified before designing into
production. A detailed application note is available to provide verification support, AN-2013 SNVA417 . In general,
calculated output capacitance values below the suggested value will have reduced phase margin and higher
control loop bandwidth. Output capacitance values above the suggested values will experience a lower
bandwidth and increased phase margin. Higher bandwidth is associated with faster system response to sudden
changes such as load transients. Phase margin changes the characteristics of the response. Lower phase
margin is associated with underdamped ringing and higher phase margin is associated with overdamped
response. Losing all phase margin will cause the system to be unstable; an optimized area of operation is 30° to
60° of phase margin, with a bandwidth of 100 kHz ±20 kHz.
Copyright ? 2010–2013, Texas Instruments Incorporated
Product Folder Links: LMZ10505EXT
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LMZ10505TZ-ADJ | 制造商:NSC 制造商全称:National Semiconductor 功能描述:5A SIMPLE SWITCHER? Power Module with 5.5V Maximum Input Voltage |
| LMZ10505TZ-ADJ/NOPB | 功能描述:直流/直流开关转换器 5V,5A PWR MODULE RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| LMZ10505TZADJNOPB | 制造商:Texas Instruments 功能描述:Module DC-DC 1-OUT 0.8V to 5V 5A 7-Pin TO-PMOD EP |
| LMZ10505TZE-ADJ | 制造商:NSC 制造商全称:National Semiconductor 功能描述:5A SIMPLE SWITCHER? Power Module with 5.5V Maximum Input Voltage |
| LMZ10505TZE-ADJ/NOPB | 功能描述:直流/直流开关转换器 RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
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