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參數(shù)資料
| 型號： | SC2440TETRT |
| 廠商： | Semtech Corporation |
| 英文描述： | 2.5 MHz Dual Switching Regulator with Integrated 2A Switches |
| 中文描述： | 2.5 MHz雙開關(guān)穩(wěn)壓器集成甲開關(guān) |
| 文件頁數(shù)： | 16/26頁 |
| 文件大?。?/td> | 643K |
| 代理商： | SC2440TETRT |
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16
2005 Semtech Corp.
www.semtech.com
SC2440
POWER MANAGEMENT
Applications Information
the soft-start pins is pulled low, 105μA flows out of that
pin. Pulling both soft-start pins below 0.2V shuts off the
internal bias circuit of the SC2440. The total V
IN
current
decreases to 38μA. In shutdown either SS pin sources
only 2μA. A fast charging circuit (enabled by the internal
bias circuit), which charges the soft-start capacitor below
1V, causes the difference in the soft-start pin currents.
If either SS pin is released in shutdown, the internal
current source pulls up on the SS pin. When this SS
voltage reaches 0.3V, the SC2440 turns on and the V
IN
quiescent current increases to 3.3mA. The current
flowing out of the other SS pin (which is still pulled low)
increases to 105μA. The fast charging circuit quickly pulls
the released soft-start capacitor to 1V (slightly below the
switching threshold). The fast charging circuit is then
disabled. A 1.8μA current source continues to charge
the soft-start capacitor (Figure 3). The soft-start voltage
ramp at the SS pin clamps the error amplifier output
(Figure 2). During regulator start-up, COMP voltage follows
the SS voltage. The converter starts to switch when its
COMP voltage exceeds 1.1V. The peak inductor current
gradually increases until the converter output comes into
regulation. Proper soft-start prevents output overshoot
during start-up. Current drawn from the input supply is
also well controlled. Notice that the inductor current, not
the converter output voltage, is ramped during soft-start.
Both soft-start capacitors are charged to a final voltage
of about 2.4V.
Figure 10(a).Normal Soft-start.
Fast
Charge
Output must be at
least 74% of its set
voltage in this
interval or the
regulator will
undergo shutdown
and restart
(hiccup).
Hiccup
Enabled
0.3V
1V
0
2V
2.4V
Switching Starts
V
SS
0.74V
V
FB
0
1V
1V
2V
0.3V
0
Switching
Not Switching
Switching
Not Switching
0
0.74V
1V
V
FB
V
SS
V
COMP
Figure 10(b). Start-up Fails due to (i) Short Soft-start Duration or (ii) Output Overload or (iii)
Output Short-circuited.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SC2441A | 1.8V to 20V Input 2-Phase Synchronous Step-down Controllers with Step-up Converter |
| SC2441AEVB | 1.8V to 20V Input 2-Phase Synchronous Step-down Controllers with Step-up Converter |
| SC2441ATETRT | 1.8V to 20V Input 2-Phase Synchronous Step-down Controllers with Step-up Converter |
| SC2441 | Very Low Input Voltage 2-Phase Synchronous Step-down Controllers with Step-up Converter |
| SC2441EVB | Very Low Input Voltage 2-Phase Synchronous Step-down Controllers with Step-up Converter |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SC2441 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Very Low Input Voltage 2-Phase Synchronous Step-down Controllers with Step-up Converter |
| SC2441A | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:1.8V to 20V Input 2-Phase Synchronous Step-down Controllers with Step-up Converter |
| SC2441A_09 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:1.8V to 20V Input 2-Phase Synchronous Step-down Controllers with Step-up Converter |
| SC2441AEVB | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:1.8V to 20V Input 2-Phase Synchronous Step-down Controllers with Step-up Converter |
| SC2441ATETRT | 制造商:Semtech Corporation 功能描述: |
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