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NCP1562A Datasheet(PDF) 4 Page - ON Semiconductor

Part No. NCP1562A
Description  High Performance Active Clamp/Reset PWM Controller
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCP1562A Datasheet(HTML) 4 Page - ON Semiconductor

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NCP1562A, NCP1562B
Main output of the PWM Controller. OUT1 has a source resistance of 4.0 Ω (typ.) and a sink resistance
of 2.5 Ω (typ.). OUT1 is designed to handle up to 2.5 A. OUT1 trails OUT2 during a low to high
transition and leads OUT2 during a high to low transition.
Positive input supply. This pin connects to an external capacitor for energy storage. An internal current
source supplies current from Vin to this pin. Once the voltage on VAUX reaches approximately 10.3 V,
the current source turns OFF and the outputs are enabled. It turns ON again once VAUX falls to 8.0 V. If
the bias current consumption exceeds the startup current, VAUX will continue to discharge. Once VAUX
reaches 7.0 V, the outputs are disabled allowing VAUX to charge. During normal operation, power is
supplied to the IC via this pin by means of an auxiliary winding. The startup circuit is disabled once the
voltage on the VAUX pin exceeds 10.3 V. If the VAUX voltage drops below 1.2 V (typ), the startup
current is reduced to 200 mA.

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