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| 型号： | LMZ10505EXTTZE/NOPB |
| 厂商： | National Semiconductor |
| 文件页数： | 10/31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： | 45 |
| 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： | 管件 |
| 工作温度： | -55°C ~ 125°C |
| 效率： | 96% |
| 电源（瓦特）- 最大： | 25W |
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LMZ10505EXT
SNVS669G – JUNE 2010 – REVISED OCTOBER 2013
where the PWM duty cycle, D, is given by:
www.ti.com
D=
V OUT
V IN
(2)
If Δ V IN is 1% of V IN , this equals to 50 mV and f SW = 1 MHz
) x ( 1 - 2.5V )
5A x (
C in &
2.5V
5V 5V
1 MHz x 50 mV
& 25 μ F
(3)
A second criteria before finalizing the C in bypass capacitor is the RMS current capability. The necessary RMS
current rating of the input capacitor to a buck regulator can be estimated by
I Cin(RMS) = I OUT x D(1-D)
(4)
(5)
With this high AC current present in the input capacitor, the RMS current rating becomes an important
parameter. The maximum input capacitor ripple voltage and RMS current occur at 50% duty cycle. Select an
input capacitor rated for at least the maximum calculated I Cin(RMS) .
Additional bulk capacitance with higher ESR may be required to damp any resonance effects of the input
capacitance and parasitic inductance.
Output Capacitor Selection
In general, 22 μF to 100 μF high quality dielectric (X5R, X7R) ceramic capacitor rated at twice the maximum
output voltage is sufficient given the optimal high frequency characteristics and low ESR of ceramic dielectrics.
Although, the output capacitor can also be of electrolytic chemistry for increased capacitance density.
Two output capacitance equations are required to determine the minimum output capacitance. One equation
determines the output capacitance (C O ) based on PWM ripple voltage. The second equation determines C O
based on the load transient characteristics. Select the largest capacitance value of the two.
The minimum capacitance, given the maximum output voltage ripple ( Δ V OUT ) requirement, is determined by the
following equation:
C OUT =
i L
8 x f SW x [ V OUT ± ( i L x R ESR )]
(6)
Where the peak to peak inductor current ripple ( Δ i L ) is equal to:
i L =
(V IN - V OUT ) x D
L x f SW
(7)
R ESR is the total output capacitor ESR, L is the inductance value of the internal power inductor, where L = 1.5
μH, and f SW = 1 MHz. Therefore, per the design example:
(5V ± 2.5V) x
i L =
2.5V
5V
1.5 2 H x 1 MHz
= 833 mA
(8)
The minimum output capacitance requirement due to the PWM ripple voltage is:
(9)
(10)
Three miliohms is a typical R ESR value for ceramic capacitors.
The following equation provides a good first pass capacitance requirement for a load transient:
C o J
I step x V FB x L x V IN
4 x V OUT x (V IN -V OUT ) x Vo_tran
(11)
Where I step is the peak to peak load step (10% to 90% of the maximum load for this example), V FB = 0.8V, and
Δ V o_tran is the maximum output voltage deviation, which is ±20 mV.
Therefore the capacitance requirement for the given design parameters is:
10
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Copyright ? 2010–2013, Texas Instruments Incorporated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LMZ10505EXTTZX | 制造商:TI 制造商全称:Texas Instruments 功能描述:5A SIMPLE SWITCHER?? Power Module with 5.5V Maximum Input Voltage for Military and Rugged Applications |
| LMZ10505EXTTZX/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 |
| 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 |
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