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SC2620 Datasheet(PDF) 13 Page - Semtech Corporation

No. de pieza SC2620
Descripción Electrónicos  Dual 2A, 30V Step-down Regulator with Programmable Frequency up to 1.4MHz
PDF  26 Pages
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Fabricante Electrónico  SEMTECH [Semtech Corporation]
Página de inicio  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC2620 Datasheet(HTML) 13 Page - Semtech Corporation

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 2006 Semtech Corp.
www.semtech.com
SC2620
POWER MANAGEMENT
Applications Information
The switch base current
β
I
1
β
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. Charge
β
T
I
ON
SW
is drawn from C
BST during the switch on time, resulting in a
voltage droop of
BST
ON
SW
βC
T
I
. If I
SW = 2A, TON = 1µs, β = 35 and
C
BST = 0.1µF, then the
BST
C
V
droop will be 0.57V. C
BST is
refreshed to
RECT
BST
D
D
A
V
V
V
+
−
every cycle, where
A
V is the
applied D
BST anode voltage. Switch base current discharges
the bootstrap capacitor to
BST
ON
SW
D
D
A
C
T
I
V
V
V
RECT
BST
β
−
+
−
at the
end of conduction. This voltage must be higher than the
minimum shown in Figure 6 to ensure full switch
enhancement. D
BST 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
Figure 7. Methods of Bootstrapping the SC2620.
MAX V
BST = 2VIN
MAX V
BST = VIN + VOUT
MAX V
BST = 2VIN - VZ
MAX V
BST = VS
(a)
SC2620
BOOST
GND
IN
SW
DBST
VOUT
CBST
VIN
DRECT
(b)
(c)
SC2620
BOOST
GND
IN
SW
DBST
VOUT
CBST
VIN
VS > 2.5V
DRECT
(d)
SC2620
BOOST
GND
IN
SW
DBST
VOUT
CBST
VIN
DRECT
(d)
SC2620
BOOST
GND
IN
SW
DBST
VOUT
VIN
VS > VIN + 2.5V
DRECT
SC2620
BOOST
GND
IN
SW
DBST
VOUT
CBST
VIN
DRECT
DZ
+ VZ -
MAX V
BST = VIN + VS



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