FAN8303 Просмотр технического описания (PDF) - ON Semiconductor
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FAN8303 Datasheet PDF : 13 Pages
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Pin Configuration
BS
SS
VIN
EN
SW
GND
COMP
FB
Figure 3. Pin Configuration (Top View)
Pin Definitions
Name Pin #
BS
1
VIN
2
SW
3
GND
4
FB
5
COMP
6
EN
7
SS
8
Type
Bootstrap
Supply Voltage
Switch
Ground
Feedback
Compensation
Enable
Soft Start
Description
High-Side Drive BOOT Voltage. Connect through capacitor (CBS) to SW.
The IC includes an internal synchronous bootstrap diode to recharge the
capacitor on this pin to VCC when SW is LOW.
Power Input. This pin needs to be closely decoupled to the GND pin with a
10 µF or greater ceramic capacitor.
Power Switching Output. SW is the switching node that supplies power to
the output.
Power Return and Signal Ground for the IC. All internal control voltages
are referred to this pin. Tie this pin to the ground island / plane through the
lowest impedance connection. This pin is the ground reference for the
regulated output voltage.
Feedback Input. This pin is the center tap of the external feedback voltage
resistive divider across the output.
Compensation Node. Frequency compensation is accomplished at this
node by connecting a series R-C to ground.
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.
External Soft-Start. A capacitor connected between this pin and GND can
be used to set soft-start time.
© 2008 Fairchild Semiconductor Corporation
FAN8303 • Rev. 1.2
3
www.fairchildsemi.com
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