Intersil 公司的ISL8201M是 20V 10A输出电流的可变输出降压电源,是高性能PWM控制器,开关频率600kHz,它集成了功率MOSFET,电感和所有的无源元件,可以实现完整的DC/DC电源解决方案. ISL8201M输入电压从1V到20V, 采用单个分压电阻可实现输出电压从0.6V到5V, 峰值电流达17A,效率高达95%,可用在服务器,工业设备,POL稳压,电信和数据通信设备以及其它通用降压DC/DC转换器.本文介绍了ISL8201M的主要特性,方框图,典型应用电路和ISL8201MEVAL1Z 评估板电路图与材料清单.
The ISL8201M is a 20V, 10A
output current, variable
output step-down
power supply. Included in the 15mmx15mm package is a high
performance PWM controller switching at 600kHz,
power MOSFETs, an inductor, and all the passive
components required for complete DC/DC
power solution.
The ISL8201M operates over an input voltage range of 1V to 20V and supports an
output voltage range of 0.6V to 5V, which is set by a single dividing
resistor. This high efficiency power module is capable of delivering 10A (17A peak) output
with up to 95% efficiency, needing no heat sinks or airflow to meet power specifications. Only
bulk input and output capacitors are needed to finish the design. Utilizing voltage-mode control, the output voltage can be precisely regulated to as low as 0.6V
with up to ±1% output voltage regulation. The ISL8201M also features internal compensation, internal soft-start, auto-recovery overcurrent protection, an enable option, and pre-biased output start-up capability.
The ISL8201M is packaged in a thermally enhanced, compact (15mmx15mm) and low profile (3.5mm) over-molded QFN Package Module suitable for automated assembly by standard surface mount equipment. The ISL8201M is Pb-free and RoHS compliant.
ISL8201M主要特性:
Complete Switch Mode Power Supply
Input Voltage Range from +4.5 to +14.4V
Wide Input Voltage Range from 1V up to 20V
10A DC Output Current, 17A Peak Output Current
Adjustable +0.6V to +5V Output Range
Up to 95% Efficiency
Simple Voltage Mode Control
Fixed 600kHz Switching Frequency
Fast Transient Response
Enable Function Option
Pre-biased Output Start-up Capability
Internal Soft-Start
Overcurrent Protection by Low-Side MOSFET rDS(ON) Sensing (Non-Latching, Auto-Recovery)
Small Footprint, Low Profile Surface Mount QFN Package (15mmx15mmx3.5mm)
Pb-Free (RoHS Compliant)
ISL8201M 应用:
Servers
Industrial Equipment
Point of Load Regulation
Other General Purpose Step-Down DC/DC
Telecom and Datacom Applications
图1.ISL8201M内部方框图
图2.ISL8201M典型应用电路
ISL8201MEVAL1Z 评估板
The ISL8201MEVAL1Z POL module evaluation board is shown in Figure 3. The user can use it to evaluate the
performance of the
Intersil ISL8201MEVAL1Z POL Module.
This board consists of power and load connectors for source and load side, switches for PVCC bias selection and On/Off option, and other passive
components.
The input voltage range is from 1V to 20V, and the output voltage range is from 0.6V to 5V. Additional PVCC bias source is not required when using an input voltage of 5V or 12V. It can connect to the input side directly. However, in wider input ranges, which are above 14V or below 5V, the PVCC bias needs to add an external source, which provides operation bias of the module. The output voltage is initially set at 1.5V for typical evaluation.
图3.ISL8201MEVAL1Z POL 评估板外形图
NOTES:
1. R1 is used to set the output voltage of ISL8201MEVAL1Z. Initial setting is 6.49kΩ for 1.5V output voltage.
2. R2 and R3, paralleling
with R1, are used to adjust the output voltage of ISL8201MEVAL1Z.
3. R4 is used to set the overcurrent trip level of ISL8201MEVAL1Z. The ISL8201MEVAL1Z has integrated 3.57kΩ.
4. R18, C18 and C19 are the snubber network, which can reduce the stress for internal semiconductor.
5. R13, R14, C12, C13, C14 and C15 are the external compensation network. The ISL8201MEVAL1Z has integrated the type 3 compensation network inside the module for typical applications.
6. R15, R16, R17, R20, R21, C17, Q2 and Q3 are the power-up sequence circuit. In case of PVCC bias, power-up first, then input voltage. This circuit has to be implemented.
图4.ISL8201MEVAL1Z 评估板电路图
ISL8201MEVAL1Z 评估板材料清单(BOM):
