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參數(shù)資料
| 型號(hào)： | 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(yè)數(shù)： | 14/26頁(yè) |
| 文件大?。?/td> | 643K |
| 代理商： | SC2440TETRT |
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14
2005 Semtech Corp.
www.semtech.com
SC2440
POWER MANAGEMENT
Applications Information
The switch base current
a
I
1
a
I
SW
SW
≈
+
=
, where I
SW
and
β
are the switch emitter current and current gain
respectively, is drawn from the bootstrap capacitor C
BST
.
T
I
ON
SW
is
drawn from C
BST
during the switch on
Charge
a
time, resulting in a voltage droop of
BST
ON
SW
aC
T
I
.
If I
SW
= 2A,
T
ON
= 1
μ
s,
β =
35
and C
BST
= 0.1
μ
F, then the
will be 0.57V. C
BST
is refreshed to
cycle, where
V is the applied D
BST
anode voltage. Switch
base current discharges the bootstrap capacitor to
T
I
V
V
V
RECT
BST
β
difference between this voltage and that at SW must be
BST
C
V
V
+
droop
RECT
D
BST
D
A
V
V
every
BST
ON
SW
C
D
D
A
+
at the end of conduction.
The
higher than the minimum shown in Figure 7 to maximize
efficiency. D
can be tied either to the input or to the
output of the DC/DC converter.
If
D
BST
is tied to the input, then the charge drawn from
the input power supply will be
β
ON
SW
T
I
(the base charge
of the switch). The energy loss due to base charge per
T
V
I
for a power loss of
cycle is
β
ON
IN
SW
β
≈
β
OUT
V
SW
I
IN
SW
V
DI
.
If
D
BST
is tied to the output, then the charge drawn from
the output capacitor will still be
β
ON
SW
T
I
. The energy loss
due to base charge per cycle is
β
ON
OUT
V
SW
I
T
for a power
Figure 8.Methods of Bootstrapping the SC2440.
MAX V
BST
=
2V
I
N
MAX V
BST
=
V
I
N
+
V
OUT
MAX V
BST
=
V
I
N
+
V
S
MAX V
BST
=
V
S
(a)
SC2440
GND
BOOST
IN
SW
DBST
VOUT
CBST
VIN
D
RECT
(b)
SC2440
BOOST
GND
IN
SW
DBST
VOUT
CBST
VIN
D
RECT
(d)
SC2440
BOOST
GND
IN
SW
DBST
VOUT
VIN
VS > VIN + 2.5V
D
RECT
SC2440
BOOST
GND
IN
SW
DBST
VOUT
CBST
VIN
VS > 2.5V
(c)
D
RECT
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|---|---|
| SC2441A | 1.8V to 20V Input 2-Phase Synchronous Step-down Controllers with Step-up Converter |
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| SC2441ATETRT | 1.8V to 20V Input 2-Phase Synchronous Step-down Controllers with Step-up Converter |
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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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