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參數(shù)資料
| 型號(hào)： | PM6685TR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, QCC32 |
| 封裝： | 5 X 5 MM, 1 MM HEIGHT, 0.50 MM PITCH, LEAD FREE, VFQFPN-32 |
| 文件頁數(shù)： | 20/52頁 |
| 文件大?。?/td> | 2536K |
| 代理商： | PM6685TR |
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PM6685
Device description
27/52
Figure 34. Current waveforms in current limit conditions
Being fixed the valley threshold, the greater the current ripple is, greater the DC output
current is
The valley current limit can be set with resistor RCSENSE:
Equation 6
Where ICSENSE = 100uA, RDSon is the drain-source on resistance of the low side switch.
Consider the temperature effect and the worst case value in RDSon calculation.
The accuracy of the valley current threshold detection depends on the offset of the internal
comparator (
V
OFF) and on the accuracy of the current generator(ICSENSE):
Equation 7
Where RSNS is the sensing element (RDSon).
PM6685 provides also a fixed negative peak current limit to prevent an excessive reverse
inductor current when the switching section sinks current from the load in PWM mode. This
negative current limit threshold is measured between PHASE and SGND pins, comparing
the magnitude drop on the PHASE node during the conduction time of the low side
MOSFET with an internal fixed voltage of 120mV.
If the current is sensed on the low side MOSFET, the negative valley-current limit INEG (if
the device works in PWM mode) is given by:
Inductor current
Valley current threshold
DC current limit = maximum load
Current
Time
Maximum load current
is influenced by the
inductor current ripple
CSENSE
Lvalley
DSon
CSENSE
I
R
×
=
SNS
CSENSE
OFF
CSENSE
Lvalley
R
100
I
R
V
I
+
+
×
+
=
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PM6686 | 制造商:STMicroelectronics 功能描述: |
| PM6686TR | 功能描述:DC/DC 開關(guān)控制器 Step-down Controller w/adj. voltages-dual 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 |
| PM6-6F-L | 功能描述:端子 Metric Fork Terminal non-insulated, 4.0 RoHS:否 制造商:AVX 產(chǎn)品:Junction Box - Wire to Wire 系列:9826 線規(guī):26-18 接線柱/接頭大小: 絕緣: 顏色:Red 型式:Female 觸點(diǎn)電鍍:Tin over Nickel 觸點(diǎn)材料:Beryllium Copper, Phosphor Bronze 端接類型:Crimp |
| PM6-6R-D | 制造商:Panduit Corp 功能描述: |
| PM6-6R-L | 功能描述:端子 Metric Ring Terminal non-insulated, 2.5 RoHS:否 制造商:AVX 產(chǎn)品:Junction Box - Wire to Wire 系列:9826 線規(guī):26-18 接線柱/接頭大小: 絕緣: 顏色:Red 型式:Female 觸點(diǎn)電鍍:Tin over Nickel 觸點(diǎn)材料:Beryllium Copper, Phosphor Bronze 端接類型:Crimp |
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