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SS8051T12TR датащи(PDF) 6 Page - Silicon Standard Corp.

номер детали SS8051T12TR
подробное описание детали  Micro-Power Step-up DC/DC Converter
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производитель  SSC [Silicon Standard Corp.]
домашняя страница  http://www.siliconstandard.com
Logo SSC - Silicon Standard Corp.

SS8051T12TR датащи(HTML) 6 Page - Silicon Standard Corp.

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SS8051
Rev.2.01 6/06/2003
APPLICATIONS INFORMATION
The SS8051 is a boost converter with an integrated
N-channel MOSFET (refer to the block diagram above).
The boost cycle is initiated when the FB pin voltage drops
below 1.2V and the MOSFET turns on. During the period
that the MOSFET is on, the inductor current ramps up
until the 350mA current limit is reached. Then the
MOSFET turns off and the inductor current flows through
the external schottky diode, ramping down to zero.
During the MOSFET off period, the inductor current
charges the output capacitor and the output voltage
climbs. This pumping mechanism continues cycle by
cycle until the FB pin voltage exceeds 1.2V and the
non-switching mode starts. In this mode, the SS8051
consumes as little as 20uA typically, saving on battery
power.
Choosing an Inductor
There are several recommended inductors that work
well with the SS8051 in Table 1. Use the equations
and recommendations in the next few sections to find
the proper inductance value for your design.
TABLE 1. RECOMMENDED INDUCTORS
PART
VALUE?
µH)
MAX DCR ?
W)
VENDOR
LQH3C4R7
LQH3C100
LQH3C220
4.7
10
22
0.26
0.30
0.92
Murata
www.murata.com
CD43-4R7
CD43-100
CDRH4D18-4R7
CDRH4D18-100
4.7
10
4.7
10
0.11
0.18
0.16
0.20
Sumida
www.sumida.com
DO1608-472
DO1608-103
DO1608-223
4.7
10
22
0.09
0.16
0.37
Coilcraft
www.coilcraft.com
Inductor Selection – Boost Regulator
The appropriate inductance value for the boost regulator
application may be calculated from the following
equation. Select a standard inductor close to this value.
VOUT-VIN(MIN)+VD
L =
ILIM
x tOFF
+
+
VREF
BIAS
SHUTDOWN
LOGIC
C2
SW
L1
SHDN
VCC
C1
R1
R2
VOUT
FB
ERROR
COMP
1.2 V
en _sw
GND
PUMP CONTROL
OC
COMP
DRIVER
T OFF PULSE
CONTROL
V OUT
V IN
+
+
VREF
BIAS
SHUTDOWN
LOGIC
C2
SW
L1
SHDN
VCC
C1
R1
R2
VOUT
FB
ERROR
COMP
1.2 V
en _sw
GND
PUMP CONTROL
OC
COMP
DRIVER
T OFF PULSE
CONTROL
V OUT
V IN
BLOCK DIAGRAM


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