參數(shù)資料
型號： PM6675
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, QCC24
封裝： 4 X 4 MM, VFQFPN-24
文件頁數(shù)： 19/47頁
文件大小： 650K
代理商： PM6675
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Device description
PM6675
26/47
It must be taken into account that the current limit circuit actually regulates the inductor
valley current. This means that RILIM must be calculated to set a limit threshold given by the
maximum DC output current plus half of the inductor ripple current:
Equation 21
The PM6675 provides also a fixed negative current limit to prevent excessive reverse
inductor current when the switching section sinks current from the load in forced-PWM (3rd
quadrant working conditions). This negative current limit threshold is measured between
PHASE and PGND pins, comparing the drop magnitude on PHASE pin with an internal
120mV fixed threshold.
6.1.6
POR, UVLO and Soft Start
The PM6675 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 (4.2V typ.), keeping active the internal
discharge MOSFETs (only if AVCC > 1V).
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 PM6675 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. Soft-start waveforms
After a fixed 3ms total time, the soft-start finishes and UVP is released: if the output voltage
doesn't reach the Power-Good lower threshold within soft-start duration, the UVP condition
is detected and 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
during the soft-start (Figure 14 shows two examples).
DSon
ILIM
CL
R
A
100
I
=
SWEN
Current limit threshold
Switching output
Time
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PM6675AS 功能描述:DC/DC 開關(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
PM6675ASTR 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
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
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