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SC4524SETRT 数据表(PDF) 13 Page - Semtech Corporation

部件名 SC4524SETRT
功能描述  Programmable Frequency, 2A Output 30V Step-Down Switching Regulator
PDF  21 Pages
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制造商  SEMTECH [Semtech Corporation]
网页  http://www.semtech.com
标志 SEMTECH - Semtech Corporation

SC4524SETRT 数据表(HTML) 13 Page - Semtech Corporation

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 2006 Semtech Corp.
www.semtech.com
SC4524
POWER MANAGEMENT
Applications Information
cycle is
b
ON
IN
SW
T
V
I
for a power loss of
b
»
b
OUT
SW
IN
SW
V
I
V
DI
.
If D
BST is tied to the output, then the charge drawn from
the output capacitor will still be
b
ON
SW T
I
. The energy loss
due to base charge per cycle is
b
ON
OUT
SW
T
V
I
for a power
loss of
b
OUT
SW V
DI
.
Since V
OUT < VIN, DBST should always be tied to VOUT (if
>2.5V) to maximize efficiency. In general efficiency
penalty increases as D decreases.
Figure 7 summarizes various ways of bootstrapping the
SC4524. A fast switching PN diode (such as 1N4148 or
MAX V
BST = 2VIN
MAX V
BST = VIN + VOUT
MAX V
BST = 2VIN - VZ
MAX V
BST = VS
MAX V
BST = VIN + VS
Figure 7. Methods of Bootstrapping the SC4524.
(a)
SC4524
BST
GND
IN
SW
DBST
VOUT
CBST
VIN
DRECT
(b)
(c)
SC4524
BST
GND
IN
SW
DBST
VOUT
CBST
VIN
VS > 2.5V
DRECT
(d)
SC4524
BST
GND
IN
SW
DBST
VOUT
CBST
VIN
DRECT
(d)
SC4524
BST
GND
IN
SW
DBST
VOUT
VIN
VS > VIN + 2.5V
DRECT
SC4524
BST
GND
IN
SW
DBST
VOUT
CBST
VIN
DRECT
DZ
+ VZ -



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