Intersil 公司的ISL70001SRH是耐辐射高效同步降压电源稳压器,输入电压3V到5.5V,输出电压外部调节,从0.8V到输入电压的85%,效率大于90%,输出电流在TJ< +145℃时为6A. 耐辐射剂量在50-300rad(Si)/s之间,主要用在FPGA,CPLD, DSP,CPU核或I/O电源,以及低压高密度分布式电源系统.本文介绍ISL70001SRH耐辐射电源主要特性,功能方框图,典型应用电路以及ISL70001SRHEVAL1Z评估板电路图和材料清单(BOM):
The ISL70001SRH is a radiation hardened and SEE hardened high efficiency monolithic synchronous buck regulator with integrated MOSFETs. This single chip power solution operates over an input voltage range of 3V to 5.5V and provides a tightly regulated output
voltage that is externally adjustable from 0.8V to ~85% of the input voltage. Output load current capacity is 6A for TJ < +145℃.
The ISL70001SRH utilizes peak current-mode control with integrated compensation and switches at a fixed frequency of 1MHz. Two ISL70001SRH devices can be synchronized 180° out-of-phase to reduce input RMS ripple current. These attributes reduce the number and size of external components required, while providing excellent output transient response. The internal synchronous power switches are optimized for high efficiency and good thermal performance.
The chip features a comparator type enable input that provides flexibility. It can be used for simple digital on/off control or, alternately, can provide undervoltage lockout capability by precisely sensing the level of an external supply voltage using two external resistors. A power-good signal indicates when the output voltage is within ±11% typical of the nominal output voltage.
Regulator start-up is controlled by an analog soft-start circuit, which can be adjusted from approximately 2ms to 200ms using an external capacitor.
The ISL70001SRH incorporates fault protection for the regulator. The protection circuits include input undervoltage, output undervoltage and output overcurrent.
High integration makes the ISL70001SRH an ideal choice to power many of today’s small form factor applications. Two devices can be synchronized to provide a complete power solution for large scale digital ICs, like field programmable gate arrays (FPGAs), that require separate core and I/O voltages.
ISL70001SRH 主要特性:
• Electrically Screened to DSCC SMD 5962-09225
• QML Qualified per MIL-PRF-38535 Requirements
• Full Mil-Temp Range Operation (TA = -55°C to +125°C)
• Radiation Hardness
- Total Dose [50-300rad(Si)/s] . . . 100krad(Si) min
• SEE Hardness
- SEL and SEB LETeff . . . . . . 86.4MeV/mg/cm2 min
- SEFI X-section (LETeff = 86.4MeV/mg/cm2) 1.4 x 10-6 cm2 max
- SET LETeff (< 1 Pulse Perturbation) 86.4MeV/mg/cm2 min
• High Efficiency > 90%
• Fixed 1MHz Operating Frequency
• Operates from 3V to 5.5V Supply
• ±1% Reference Voltage over Line, Load, Temperature and Radiation
• Adjustable Output Voltage
- Two External Resistors Set VOUT from 0.8V to ~85% of VIN
• Excellent Dynamic Response
• Bi-directional SYNC Pin Allows Two Devices to be Synchronized 180° Out-of-Phase
• Device Enable with Comparator Type Input
• Power-Good Output Voltage Monitor
• Adjustable Analog Soft-Start
• Input Undervoltage, Output Undervoltage and Output Overcurrent Protection
• Starts Into Pre-Biased Load
ISL70001SRH 应用:
• FPGA, CPLD, DSP, CPU Core or I/O Voltages
• Low-Voltage, High-Density Distributed Power Systems
图1.ISL70001SRH功能方框图
图2.ISL70001SRH 5V输入应用电路图
图3.ISL70001SRH 3.3V输入应用电路图
ISL70001SRHEVAL1Z评估板
The ISL70001SRHEVAL1Z evaluation board is designed to demonstrate the features of the ISL70001SRH, a TID and SEE hardened 6A synchronous buck regulator IC with integrated MOSFETs intended for Space applications.
The ISL70001SRHEVAL1Z evaluation board accepts a nominal 3V to 5.5V input voltage and provides a regulated output voltage ranging from 0.8V to 85% of the input voltage at output currents ranging from 0A to 6A. The output can be quickly set to any of six commonly used preset voltages (0.8V, 1.0V, 1.2V, 1.8V, 2.5V, 3.3V) or adjusted to an alternate voltage using the onboard potentiometer. A PGOOD (Power Good) signal goes high and lights a red LED to indicate that the output voltage is within a ±11% typical regulation WINOOW. A toggle switch is provided to conveniently enable or disable the output voltage.
The ISL70001SRHEVAL1Z evaluation board can be set to run from the nominal 1MHz internal oscillator of the ISL70001SRH or synchronized to a 1MHz ±20% external clock. Two or more ISL70001SRHEVAL1Z evaluation boards can be synchronized to each other in a Master/Slave configuration, with all Slave units switching 180°out-of-phase with respect to the Master unit.
图4.ISL70001SRHEVAL1Z评估板电路图
ISL70001SRHEVAL1Z评估板材料清单(BOM):
详情请见:
http://www.intersil.com/data/fn/fn6947.pdf
和
http://www.intersil.com/data/an/an1518.pdf
本文关键字：暂无联系方式电子技术，电工技术 - 电子技术
