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| 型号： | LM27402SQ |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 1350 kHz SWITCHING FREQ-MAX, QCC16 |
| 封装： | 4 X 4 MM, 0.80 MM HEIGHT, 0.65 MM PITCH, LLP-16 |
| 文件页数： | 4/32页 |
| 文件大小： | 653K |
| 代理商： | LM27402SQ |
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FIGURE 2. Current Limit Timing Diagram
In the example shown in Figure 2, the LM27402 immediately
turns off the high-side FET when an over-current pulse is de-
tected. After the third over-current event is detected, 24
switching cycles occur before the fourth over-current pulse is
detected. Since the current limit logic does not count 32
switching cycles between two over-current events, the inter-
nal current limit counter is not reset and continues counting
until the LM27402 enters hiccup mode. The soft-start capac-
itor is then discharged to initialize startup and a wait period of
1.28 ms occurs.
NEGATIVE CURRENT LIMIT
To prevent excess negative current, the LM27402 imple-
ments a negative current limit through the low-side FET.
Negative current limit is only enabled when an over-voltage
event is detected. Should an over-voltage fault occur, the low-
side FET will turn off if the SW pin voltage exceeds a positive
100mV during the low-side on time, thereby protecting the
powertrain from excessive negative current.
POWER GOOD
The PGOOD pin of the LM27402 is used to signal when the
output is out of regulation or during non-regulated pre-biased
conditions. This means that current limit, UVLO, over-voltage
threshold, under-voltage threshold, or a non regulated output
will cause the PGOOD pin to pull low. To prevent glitches to
PGOOD, a 20
μs de-glitch filter is built into the LM27402.
Figure 3 illustrates when the PGOOD flag is asserted low.
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LM27402
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM27402SQ/NOPB | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| LM27402SQEVAL/NOPB | 功能描述:电源管理IC开发工具 LM27402SQ EVAL BOARD RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| LM27402SQX | 制造商:NSC 制造商全称:National Semiconductor 功能描述:High Performance Synchronous Buck Controller with DCR Current Sensing |
| LM27402SQX/NOPB | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| LM27403 | 制造商:TI 制造商全称:Texas Instruments 功能描述:Synchronous Buck Controller with Temperature-Compensated, Inductor-DCR-Based Overcurrent Protection and Programmable Thermal Shutdown |
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