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參數(shù)資料
| 型號： | PM6686 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, QCC32 |
| 封裝： | 5 X 5 MM, 1 MM HEIGHT, 0.50 MM PITCH, ROHS COMPLIANT, VFQFPN-32 |
| 文件頁數(shù)： | 30/50頁 |
| 文件大?。?/td> | 1066K |
| 代理商： | PM6686 |
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Monitoring and protections
PM6686
36/50
Doc ID 15281 Rev 4
9.5
Charge pump
The PM6686 can drive an external charge pump circuit whose typical application schematic
is shown in the next figure.
Figure 54.
Charge pump application circuit
The charge pump works in 4 phases:
1.
LGATE is low. C1 is charged through the D1a diode at OUT1 voltage minus the diode
drop.
2.
LGATE is driven high and C1 transfers the charge to C2. C2 voltage is OUT1 voltage
plus the LGATE voltage minus the voltage drops on D1 and D2.
3.
LGATE is turned low and C2 shares its charge with C3 thought D3.
4.
LGATE becomes high and C3 can charge C4 thought diode D4.
Every diode used to transfer charge introduces a voltage drop that decreases the charge
pump output voltage.
Repeating this cycle several times makes the charge pump output voltage equals to:
Equation 6
Where VCP is the charge pump output voltage, VOUT1 is the output voltage of the switching
section 1, VLGATE1 is the low-side MOSFET gate driving voltage and VDIODE is the forward
voltage droop of the diodes used in the application.
CP_FB pin must be connected to the output of the charge pump with a resistor divider;
when CP_FB pin droops below 2 V typ., OUT1 controller starts a NA SKIP cycle to boost the
voltage of the charge pump.
PHASE
LGATE
COU T
L
CP_FB
Vo ut
C4
R2
R1
C1
C3
C2
D1
D3
D2
D4
CP
DIODE
1
LGATE
1
OUT
CP
V
4
V
2
V
+
=
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| 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 |
| PM6-6R-X | 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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