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| 型号： | LMZ14201TZ-ADJ/NOPB |
| 厂商： | National Semiconductor |
| 文件页数： | 17/27页 |
| 文件大小： | 0K |
| 描述： | IC BUCK SYNC ADJ 1A TO-PMOD-7 |
| 产品培训模块： | LMZ Power Modules SIMPLE SWITCHER® Regulators SIMPLE SWITCHER Power Modules |
| 视频文件： | Power Design Invitational - Another Geek Moment |
| 标准包装： | 1 |
| 系列： | SIMPLE SWITCHER® |
| 类型： | 非隔离（POL） |
| 输出数： | 1 |
| 电压 - 输入（最小）： | 6V |
| 电压 - 输入（最大）： | 42V |
| Voltage - Output 1： | 0.8 ~ 6 V |
| 电流 - 输出（最大）： | 1A |
| 电源（瓦） - 制造商系列： | 6W |
| 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： | 标准包装 |
| 工作温度： | -40°C ~ 125°C |
| 效率： | 90% |
| 电源（瓦特）- 最大： | 6W |
| 产品目录页面： | 1308 (CN2011-ZH PDF) |
| 其它名称： | LMZ14201TZ-ADJDKR |
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LMZ14201
www.ti.com
SNVS649F – JANUARY 2010 – REVISED OCTOBER 2013
Additional Features
OUTPUT OVER-VOLTAGE COMPARATOR
The voltage at FB is compared to a 0.92V internal reference. If FB rises above 0.92V the on-time is immediately
terminated. This condition is known as over-voltage protection (OVP). It can occur if the input voltage is
increased very suddenly or if the output load is decreased very suddenly. Once OVP is activated, the top
MOSFET on-times will be inhibited until the condition clears. Additionally, the synchronous MOSFET will remain
on until inductor current falls to zero.
CURRENT LIMIT
Current limit detection is carried out during the off-time by monitoring the current in the synchronous MOSFET.
Referring to the Functional Block Diagram, when the top MOSFET is turned off, the inductor current flows
through the load, the PGND pin and the internal synchronous MOSFET. If this current exceeds 2.0 (typical) the
current limit comparator disables the start of the next on-time period. The next switching cycle will occur only if
the FB input is less than 0.8V and the inductor current has decreased below 2.0A. Inductor current is monitored
during the period of time the synchronous MOSFET is conducting. So long as inductor current exceeds 2.0A,
further on-time intervals for the top MOSFET will not occur. Switching frequency is lower during current limit due
to the longer off-time. It should also be noted that current limit is dependent on both duty cycle and temperature
as illustrated in the graphs in the Typical Performance Characteristics section.
THERMAL PROTECTION
The junction temperature of the LMZ14201 should not be allowed to exceed its maximum ratings. Thermal
protection is implemented by an internal Thermal Shutdown circuit which activates at 165 °C (typ) causing the
device to enter a low power standby state. In this state the main MOSFET remains off causing V O to fall, and
additionally the CSS capacitor is discharged to ground. Thermal protection helps prevent catastrophic failures for
accidental device overheating. When the junction temperature falls back below 145 °C (typ Hyst = 20 °C) the SS
pin is released, V O rises smoothly, and normal operation resumes.
Applications requiring maximum output current especially those at high input voltage may require application
derating at elevated temperatures.
ZERO COIL CURRENT DETECTION
The current of the lower (synchronous) MOSFET is monitored by a zero coil current detection circuit which
inhibits the synchronous MOSFET when its current reaches zero until the next on-time. This circuit enables the
DCM operating mode, which improves efficiency at light loads.
PRE-BIASED STARTUP
The LMZ14201 will properly start up into a pre-biased output. This startup situation is common in multiple rail
logic applications where current paths may exist between different power rails during the startup sequence. The
following scope capture shows proper behavior during this event.
Figure 35. Pre-Biased Startup
OUTPUT
VOLTAGE
2V PRE-BIAS
OUTPUT
CURRENT
ENABLE
3.3V OUTPUT
1.0 V/Div
0.5 A/Div
2.0 V/Div
1 ms/Div
Copyright ? 2010–2013, Texas Instruments Incorporated
Product Folder Links: LMZ14201
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LMZ14201TZE-ADJ | 制造商:NSC 制造商全称:National Semiconductor 功能描述:1A SIMPLE SWITCHER? Power Module with 42V Maximum Input Voltage |
| LMZ14201TZE-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 |
| LMZ14201TZEADJNOPB | 制造商:Texas Instruments 功能描述:Module DC-DC 1-OUT 0.8V to 6V 1A 7-Pin TO-PMOD EP |
| LMZ14201TZX-ADJ | 制造商:NSC 制造商全称:National Semiconductor 功能描述:1A SIMPLE SWITCHER? Power Module with 42V Maximum Input Voltage |
| LMZ14201TZX-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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