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| 型号： | LMZ10505EXTTZX/NOPB |
| 厂商： | National Semiconductor |
| 文件页数： | 14/31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
SNVS669G – JUNE 2010 – REVISED OCTOBER 2013
www.ti.com
Additional Features
ENABLE
The LMZ10505EXT features an enable (EN) pin and associated comparator to allow the user to easily sequence
the LMZ10505EXT from an external voltage rail, or to manually set the input UVLO threshold. The turn-on or
rising threshold and hysteresis for this comparator are typically 1.23V and 0.15V respectively. The precise
reference for the enable comparator allows the user to ensure that the LMZ10505EXT will be disabled when the
system demands it to be.
The EN pin should not be left floating. For always-on operation, connect EN to VIN.
ENABLE AND UVLO
Using a resistor divider from VIN to EN as shown in the schematic diagram below, the input voltage at which the
part begins switching can be increased above the normal input UVLO level according to
V IN(UVLO) = 1.23V x
R trkb + R trkt
R trkt
(19)
For example, suppose that the required input UVLO level is 3.69V. Choosing R enb = 10 k ? , then we calculate
R ent = 20 k ? .
V IN
VIN
Cin1
R ent
R enb
EN
LMZ10505EXT
GND
Alternatively, the EN pin can be driven from another voltage source to cater to system sequencing requirements
commonly found in FPGA and other multi-rail applications. The following schematic shows an LMZ10505EXT
that is sequenced to start based on the voltage level of a master system rail (V OUT1 ).
Master Power Supply
V OUT1
V IN
VIN
VOUT
V OUT2
C in1
R ent
EN
LMZ10505EXT
C O1
R enb
GND
SOFT-START
The LMZ10505EXT begins to operate when both the VIN and EN, voltages exceed the rising UVLO and enable
thresholds, respectively. A controlled soft-start eliminates inrush currents during startup and allows the user more
control and flexibility when sequencing the LMZ10505EXT with other power supplies.
In the event of either VIN or EN decreasing below the falling UVLO or enable threshold respectively, the voltage
on the soft-start pin is collapsed by discharging the soft-start capacitor by a 14 μA (typ.) current sink to ground.
SOFT-START CAPACITOR
Determine the soft-start capacitance with the following relationship
C SS =
t SS x I SS
V REF
(20)
14
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Product Folder Links: LMZ10505EXT
Copyright ? 2010–2013, Texas Instruments Incorporated
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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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