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参数资料
| 型号： | LMZ10504EXTTZX |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 6.7 A SWITCHING REGULATOR, 1160 kHz SWITCHING FREQ-MAX, PSSO7 |
| 封装： | 10.16 X 13.77 MM, 4.57 MM HEIGHT, ROHS COMPLIANT, TO-PMOD, 7 PIN |
| 文件页数： | 21/22页 |
| 文件大小： | 1383K |
| 代理商： | LMZ10504EXTTZX |
Block Diagram
30118436
General Description
The LMZ10504EXT SIMPLE SWITCHER power module is
a complete, easy-to-use DC-DC solution capable of driving
up to a 4A load with exceptional power conversion efficiency,
output voltage accuracy, line and load regulation. The
LMZ10504EXT is available in an innovative package that en-
hances thermal performance and allows for hand or machine
soldering.
The LMZ10504EXT 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 LMZ10504EXT 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.
Design Guideline And Operating
Description
Design Steps
LMZ10504EXT is fully supported by Webench and offers
the following: component selection, performance, electrical,
and thermal simulations as well as the Build-It board, for a
reduced design time. On the other hand, all external compo-
nents can be calculated by following the design procedure
below.
1. Determine the input voltage and output voltage. Also, make
note of the ripple voltage and voltage transient requirements.
2. Determine the necessary input and output capacitance.
3. Calculate the feedback resistor divider.
4. Select the optimized compensation component values.
5. Estimate the power dissipation and board thermal require-
ments.
6. Follow the PCB design guideline.
7. Learn about the LMZ10504EXT features such as enable,
input UVLO, soft-start, tracking, pre-biased startup, current
limit, and thermal shutdown.
Design Example
For this example the following application parameters exist.
V
IN = 5V
V
OUT = 2.5V
I
OUT = 4A
ΔV
OUT = 20 mVpk-pk
ΔV
o_tran = ±20 mVpk-pk
Input Capacitor Selection
A 22 F or 47 F high quality dielectric (X5R, X7R) ceramic
capacitor rated at twice the maximum input voltage is typically
sufficient. The input capacitor must be placed as close as
possible to the VIN pin and GND exposed pad to substantially
eliminate the parasitic effects of any stray inductance or re-
sistance on the PC board and supply lines.
Neglecting capacitor equivalent series resistance (ESR), the
resultant input capacitor AC ripple voltage is a triangular
waveform. The minimum input capacitance for a given peak-
to-peak value (
ΔV
IN) of VIN is specified as follows:
where the PWM duty cycle, D, is given by:
If
ΔV
IN is 1% of VIN, this equals to 50 mV and fSW = 1 MHz
www.national.com
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LMZ10504EXT
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LMZ10504EXTTZX/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 |
| LMZ10504TZ-ADJ | 制造商:NSC 制造商全称:National Semiconductor 功能描述:4A SIMPLE SWITCHER?Power Module with 5.5V Maximum Input Voltage |
| LMZ10504TZ-ADJ/NOPB | 功能描述:直流/直流开关转换器 5V,4A 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 |
| LMZ10504TZE-ADJ | 制造商:NSC 制造商全称:National Semiconductor 功能描述:4A SIMPLE SWITCHER?Power Module with 5.5V Maximum Input Voltage |
| LMZ10504TZE-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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