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ViewSonic Corporation
Confidential
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Do Not Copy
VA912/b-3
16
1. Power supply (DC/DC Converter)
The AAT1109 is a one-channel step-up PWM controller incorporating a soft-start and a short circuit protection
(SCP) function. This device consists of an on-chip voltage reference, error amplifier, pulse width modulation
controller, under-voltage lockout protection, soft -start, and
short circuit protection circuits.
4. Circuit Description
Circuit Description