參數(shù)資料
型號(hào)： PM6675ASTR
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： 3 A SWITCHING CONTROLLER, QCC24
封裝： 4 X 4 MM, LEAD FREE, VFQFPN-24
文件頁(yè)數(shù)： 21/48頁(yè)
文件大?。?/td> 2481K
代理商： PM6675ASTR
Device description
PM6675AS
28/48
7.1.6
POR, UVLO and soft-start
The PM6675AS automatically performs an internal startup sequence during the rising
phase of the analog supply of the device (AVCC). The switching controller remains in a
stand-by state until AVCC crosses the upper UVLO threshold (4.25 V typ.), keeping active
the internal discharge MOSFETs (only if AVCC > 1 V).
The soft-start allows a gradual increase of the internal current limit threshold during startup
reducing the input/output surge currents. At the beginning of start-up, the PM6675AS
current limit is set to 25 % of nominal value and the under voltage protection is disabled.
Then, the current limit threshold is sequentially brought to 100 % in four steps of
approximately 750
s (figure 13).
Figure 31.
Soft-start waveforms
After a fixed 3 ms total time, the soft-start finishes and UVP is released: if the output voltage
doesn't reach the
under voltage lower threshold within soft-start duration, the UVP condition
is detected; the device performs a soft end and latches off. Depending on the load
conditions, the inductor current may or may not reach the nominal value of the current limit
(Figure 32 on page 29 shows two examples).
SWEN
Current limit threshold
Switching output
Time
相關(guān)PDF資料
PDF描述
PM6675AS 3 A SWITCHING CONTROLLER, QCC24
PM6675ATR SWITCHING CONTROLLER, QCC24
PM6675TR SWITCHING CONTROLLER, QCC24
PM6675 SWITCHING CONTROLLER, QCC24
PM6680ATR 0.4 A DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, QCC32
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PM6675ATR 功能描述:低壓差控制器 - LDO High eff SD CNRL RoHS:否 制造商:Micrel 最大輸入電壓:5.5 V 輸出電壓:Adjustable 輸出電流:10 mA 負(fù)載調(diào)節(jié): 輸出類型:Adjustable, Fixed 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-6
PM6675S 功能描述:DC/DC 開(kāi)關(guān)控制器 DDR 2/3 Memory Pwr Cntrl RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
PM6675STR 功能描述:低壓差控制器 - LDO Complete DDR2/3 Mem Pwr supply controllr RoHS:否 制造商:Micrel 最大輸入電壓:5.5 V 輸出電壓:Adjustable 輸出電流:10 mA 負(fù)載調(diào)節(jié): 輸出類型:Adjustable, Fixed 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-6
PM6675TR 功能描述:低壓差控制器 - LDO High eff SD CNRL RoHS:否 制造商:Micrel 最大輸入電壓:5.5 V 輸出電壓:Adjustable 輸出電流:10 mA 負(fù)載調(diào)節(jié): 輸出類型:Adjustable, Fixed 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-6
PM6680 功能描述:DC/DC 開(kāi)關(guān)控制器 No Rsense dual StepDwn Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
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