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參數(shù)資料
| 型號： | 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)： | 21/52頁 |
| 文件大?。?/td> | 2536K |
| 代理商： | PM6685TR |
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Device description
PM6685
28/52
Equation 8
7.7
Soft start and soft end
Each switching section is enabled separately by asserting high EN5/EN3 pins respectively.
In order to realize the soft start, at the startup the overcurrent threshold is set 25% of the
nominal value and the undervoltage protection (see related sections) is disabled. The
controller starts charging the output capacitor working in current limit. The overcurrent
threshold is increased from 25% to 100% of the nominal value with steps of 25% every
700
s (typ.). After 2.8ms (typ.) the undervoltage protection is enabled. The soft start time is
not programmable. A minimum capacitor CINT is required to ensure a soft start without any
overshoot on the output:
Equation 9
Figure 35. Soft start waveforms
When a switching section is turned off(EN5/EN3 pins low), the controller enters in soft end
mode. The output capacitor is discharged through an internal 16
P-MOSFET switch; when
the output voltage reaches 0.3V, the low-side MOSFET turns on, keeping the output to
ground. The soft end time also depends on load condition.
DSon
NEG
R
mV
120
I
=
out
L
Lvalley
INT
C
2
I
4
I
uA
6
C
×
+
≥
EN5/EN3
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 |
|---|---|
| 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 觸點電鍍:Tin over Nickel 觸點材料: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 觸點電鍍:Tin over Nickel 觸點材料:Beryllium Copper, Phosphor Bronze 端接類型:Crimp |
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