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KA3845B 데이터시트(PDF) 1 Page - Fairchild Semiconductor

부품명 KA3845B
상세설명  SMPS Controller
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제조업체  FAIRCHILD [Fairchild Semiconductor]
홈페이지  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

KA3845B 데이터시트(HTML) 1 Page - Fairchild Semiconductor

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©2002 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev. 1.0.2
Features
• Low Start up Current
• Maximum Duty Clamp
• UVLO With Hysteresis
• Operating Frequency up to 500KHz
Description
The KA3842B/KA3843B/KA3844B/KA3845B are fixed
frequency current-mode PWM controller. They are
specially designed for Off - Line and DC-to-DC converter
applications with minimum external components.
These
integrated circuits feature a trimmed oscillator for precise
duty cycle control, a temperature compensated reference,
high gain error amplifier, current sensing comparator and a
high current totempole output for driving a power MOSFET.
The KA3842B and KA3844B have UVLO thresholds of
16V (on) and 10V (off). The KA3843B and KA3845B are
8.5V (on) and 7.9V (off). The KA3842B and KA3843B can
operate within
100% duty cycle.
The
KA3844B and
KA3845B can operate with 50% duty cycle.
8-DIP
14-SOP
1
1
Internal Block Diagram
KA3842B/KA3843B/KA3844B/
KA3845B
SMPS Controller


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