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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)： | 21/26頁 |
| 文件大?。?/td> | 643K |
| 代理商： | SC2440TETRT |
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21
2005 Semtech Corp.
www.semtech.com
SC2440
POWER MANAGEMENT
Applications Information
Board Layout Considerations
In a step-down switching regulator, the input bypass
capacitor, the main power switch and the freewheeling
diode carry switched currents with high dt
di (Figure 15).
For jitter-free operation, the size of the loop formed by
these components should be minimized. Since the power
switches are already integrated within the SC2440,
connecting the anodes of both freewheeling diodes close
to the negative terminal of the input bypass capacitor
minimizes size of the switched current loop. The input
bypass capacitors should also be placed close to the
Figure 14. Overall Loop Gain and Phase versus Frequency for (a) Channel 1 and (b) Channel 2 of the Dual
DC-DC Converter in Figure 1. (c) Channel 1 Load Transient Response, I
is switched between
0.3A and 1.7A. (d) Channel 2 Load Transient Response, I
OUT2
is switched between 0.45A and
1.7A.
Upper Trace : OUT1 Voltage, AC Coupled, 0.5V/div
Lower Trace : L
1
Inductor Current, 0.5A/div
Upper Trace : OUT2 Voltage, AC Coupled, 0.5V/div
Lower Trace : L
2
Inductor Current, 0.5A/div
(d)
(c)
40
μ
s/div
V
OUT
=5V
40
μ
s/div
V
OUT
=3.3V
(a)
V
IN
=12V, V
=3.3V at 1.7A,
C
5
=470pF, R
5
=15.4K
and C
6
=10pF
(b)
V
IN
=12V, V
=5V at 1.7A,
C
7
=220pF, R
8
=24.3K
and C
9
=10pF
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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