參數(shù)資料
型號： PM6670
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： 1.4 A SWITCHING CONTROLLER, QCC24
封裝： 4 X 4 MM, LEAD FREE, VFQFN-24
文件頁數(shù)： 41/53頁
文件大小： 799K
代理商： PM6670
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Application information
PM6670
46/53
8.1.6
VDDQ current limit setting
The valley current limit is set by RCSNS and must be chosen to support the maximum load
current. The valley of the inductor current ILvalley is:
Equation 45
The output current limit depends on the current ripple as shown I Figure 41:
Figure 41. Valley current limit waveforms
As the valley threshold is fixed, the greater the current ripple, the greater the DC output
current will be. If an output current limit greater than ILOAD(max) over all the input voltage
range is required, the minimum current ripple must be considered in the previous formula.
Then the resistor RCSNS is:
Equation 46
where RDSon is the drain-source on-resistance of the low-side switch. Consider the
temperature effect and the worst case value in RDSon calculation (typically +0.4%/°C).
The accuracy of the valley current also depends on the offset of the internal comparator
(±5mV).
The negative valley-current limit (if the device works in forced-PWM mode) is given by:
Equation 47
2
I
(max)
I
L
LOAD
Lvalley
=
Inductor current
Valley current limit
MAX LOAD 1
MAX LOAD 2
Current
Time
Inductor current
uA
100
I
R
Lvalley
DSon
CSNS
=
DSon
NEG
R
mV
120
I
=
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相關代理商/技術參數(shù)
參數(shù)描述
PM6670AS 功能描述:DC/DC 開關控制器 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 安裝風格: 封裝 / 箱體:CPAK
PM6670ASTR 功能描述:直流/直流開關調(diào)節(jié)器 Complete DDR2/3 Mem Pwr supply controllr RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
PM6670ATR 功能描述:直流/直流開關調(diào)節(jié)器 Complete DDR2/3 Mem Pwr supply controllr RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
PM6670S 功能描述:DC/DC 開關控制器 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 安裝風格: 封裝 / 箱體:CPAK
PM6670STR 功能描述:DC/DC 開關控制器 Complete DDR2/3 Mem Pwr supply controllr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 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 安裝風格: 封裝 / 箱體:CPAK
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