B320 Ver la hoja de datos (PDF) - Orister Corporation
Número de pieza
componentes Descripción
Fabricante
B320 Datasheet PDF : 11 Pages
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INPUT
4.75V to 21V
10uF/35V C1
CERAMIC x2
OFF ON
C4
0.1uF
U1
2
IN
7 EN
SW 3
8 SS
FB 5
4 GND COMP 6
RS6508‐ADS
C5
L1
10nF
D1
15uH
B340A
C6 (Optional)
R3
C3
5.6KΩ 8.2nF
Page No. : 2/11
R1
25.8KΩ 1%
OUTPUT
3.3V/2A
C2
R2
10KΩ 1%
22uF/6.3V
CERAMIC x2
Pin Assignments
MSOP‐10(EP)
SOP‐8
PACKAGE
MSOP‐10(EP)
/
SOP‐8
PIN
1
‐
2
1
3
‐
4
2
5
3
6,11
4
7
5
8
6
9
7
10
8
SYMBOL
NC
BS
NC
IN
SW
GND
FB
COMP
EN
SS
DESCRIPTION
No Connect.
Bootstrap. This capacitor (C5) is needed to drive the power switch’s gate
above the supply voltage. It is connected between the SW and BS pins to
form a floating supply across the power switch driver. The voltage across
C5 is about 5V and is supplied by the internal +5V supply when the SW pin
voltage is low.
No Connect.
Supply Voltage. The RS6515 operates from a 4.75V to 20V unregulated
input. C1 is needed to prevent large voltage spikes from appearing at the
input.
Power Switching Output. SW is the switching node that supplies power to
the output. Connect the output LC filter from SW to the output load. Note
that a capacitor is required from SW to BS to power the high‐side switch.
Ground.
Feedback Input. FB senses the output voltage and regulates it. Drive FB
with a resistive voltage divider from the output voltage to ground. The
feedback threshold is 0.92V. See Setting the Output Voltage.
Compensation Node. COMP is used to compensate the regulation control
loop. Connect a series RC network from COMP to GND. In some cases, an
additional capacitor from COMP to GND is required. See Compensation.
Enable Input. EN is a digital input that turns the regulator on or off. Drive
EN high to turn on the regulator, drive it low to turn it off. For automatic
startup, leave EN unconnected.
Soft‐Start. Connect SS to an external capacitor to program the soft‐start. If
unused, leave it open.
DS‐RS6515‐08 JULY, 2010
www.Orister.com
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