VESTEL 17MB12, Service Manual

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Pre-Regulator for Linear Regulators
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Flat Panel TVs
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Set-Top Boxes
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Cigarette Lighter Powered Devices
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DVD/PVR Devices
15.3.4 Absolute Maximum Ratings
15.3.5 Electrical Characteristics
15.3.6 Pinning
Pin1:BS
High-Side Gate Drive Boost Input. BS supplies the drive for the high-side N-Channel
MOSFET switch. Connect a 10nF or greater capacitor from SW to BS to power the high
side switch.
Pin2:IN
Power Input. IN supplies the power to the IC, as well as the step-down converter
switches. Drive IN with a 4.75V to 28V power source. Bypass IN to GND with a suitably
large capacitor to eliminate noise on the input to the IC.
Pin3:SW
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
.