ViewSonic VP950b Service Manual page 23

TL494 (IC801): The TL494 incorporates all the functions required in the construction of
a pulse-width-modulation (PWM) control circuit on a single chip. Designed
primarily for power-supply control, this device offers the flexibility to tailor the
power-supply control circuitry to a specific application.
PIN Descriptions:
ViewSonic Corporation
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VP950b