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| ADP2387同步降壓DC電源穩(wěn)壓器解決方案 |
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| 文章來源： 更新時間：2016/3/24 10:45:00 |
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ADI公司的ADP2387是集成了44 mΩ高邊功率MOSFET和11 mΩ同步整流器MOSFET的同步降壓DC電源穩(wěn)壓器,在4 mm×4 mm LFCSP封裝中提供完整高效的解決方案,輸入電壓4.5V-20V,連續(xù)輸出電流6A,基準電壓0.6 V ± 1%,主要用在通信基礎(chǔ)設(shè)備,網(wǎng)絡(luò)和服務(wù)器,工業(yè)和儀表,醫(yī)療保健以及DC/DC點負載.本文介紹了ADP2387主要特性,功能框圖和多種應(yīng)用電路,以及ADP2387-EVALZ評估板優(yōu)勢和特點,電路圖,材料清單和PCB設(shè)計圖.
The ADP2387 is a synchronous step-down, dc-to-dc regulator with an integrated 44 mΩ, high-side power, metal oxide semiconductor field effect transistor (MOSFET) and an 11 mΩ, synchronous rectifier MOSFET to provide a high efficiency solution in a compact 4 mm × 4 mm LFCSP. This device uses a peak current mode, constant frequency pulse-width modulation (PWM) control scheme for excellent stability and transient response. The switching frequency of the ADP2387 can be programmed between 200 kHz to 1400 kHz. The ADP2387 requires minimal external components and operates from an input voltage of 4.5 V to 20 V. The output voltage can be adjusted from 0.6 V to 90% of the input voltage and delivers up to 6 A of continuous current. Each IC draws less than 110 μA current from the input source when it is disabled. This regulator targets high performance applications that require high efficiency and design flexibility. External compensation and an adjustable soft start function provide design flexibility. The power-good output and precision enable input provide simple and reliable power sequencing. The programmable current-limit function allows the inductor to be optimized by output current.
Other key features include undervoltage lockout (UVLO), overvoltage protection (OVP), overcurrent protection (OCP), short-circuit protection (SCP), and thermal shutdown (TSD). The ADP2387 operates over the −40℃ to +125℃ junction temperature range and is available in a 24-lead, 4 mm × 4 mm LFCSP.
ADP2387主要特性:
Input voltage range: 4.5 V to 20 V
Integrated MOSFET: 44 mΩ typical/11 mΩ typical
Reference voltage: 0.6 V ± 1%
Continuous output current: 6 A
Programmable current-limit threshold
Programmable switching frequency: 200 kHz to 1400 kHz
Precision enable and power good
External compensation Internal soft start with external adjustable option
tartup into a precharged output
Supported by ADIsimPower design tool
ADP2387應(yīng)用:
Communications infrastructure
Networking and servers
Industrial and instrumentation
Healthcare and medical
Intermediate power rail conversion
DC-to-dc point of load applications
圖1.ADP2387功能框圖
圖2.ADP2387典型應(yīng)用電路:VIN = 12 V, VOUT = 1.2 V, IOUT = 6 A, fSW = 500 kHz
圖3.ADP2387可編輸入電壓UVLO,上升閾11V,下降閾值10V的應(yīng)用電路:VIN = 12 V, VOUT = 5 V, IOUT = 6 A, fSW = 600 kHz
圖4.ADP2387可編峰值限流閾值5A:VIN = 12 V, VOUT = 3.3 V, IOUT = 3 A, fSW = 600 kHz
ADP2387-EVALZ評估板
ADP2387-EVALZ評估板是完整的6 A、20 V降壓穩(wěn)壓器解決方案，用戶可采用近乎理想的印刷電路板(PCB)布局來評估ADP2387的性能。
通過可編程限流功能，輸出電流可對電感進行優(yōu)化。峰值限流閾值預(yù)設(shè)為9 A以確保6 A輸出電流能力。開關(guān)頻率可在200 kHz至1.4 MHz范圍內(nèi)進行編程，從而實現(xiàn)可堆疊多相功率解決方案。
ADP2387-EVALZ評估板輸出預(yù)設(shè)為3.3 V，且開關(guān)頻率設(shè)置為600 kHz。不同的輸出電壓設(shè)置可以通過選用合適的無源器件來實現(xiàn)。環(huán)境工作溫度范圍為−40℃至+85℃。
ADP2387-EVALZ評估板優(yōu)勢和特點:
輸入電壓： 4.5 V至20 V
輸出電壓精度：±1%
集成MOSFET： 44 mΩ（典型值）/11 mΩ（典型值）
連續(xù)輸出電流： 6 A
可編程限流閾值
可編程開關(guān)頻率： 200 kHz至1.4 MHz
精密使能和電源良好指示
外部補償
提供外部可調(diào)選項的內(nèi)部軟啟動
啟動后進入預(yù)充電輸出
圖5.ADP2387-EVALZ評估板外形圖
圖6.ADP2387-EVALZ評估板電路圖
ADP2387-EVALZ評估板材料清單:
圖7.ADP2387-EVALZ評估板PCB設(shè)計圖(1)
圖8.ADP2387-EVALZ評估板PCB設(shè)計圖(2) |
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