UC3845DG4
TEXAS INSTRUMENTS UC3845DG4 控制器, 电流模式控制器, PWM, 25V-12V电源, 450 kHz, 13.5V/200mA输出, SOIC-14
The is a current-mode Pulse Width Modulation PWM Controller provides the necessary features to implement off-line or DC to DC fixed frequency current-mode control schemes with a minimal external parts count. Internally implemented circuits include under-voltage lockout featuring start up current less than 1mA, a precision reference trimmed for accuracy at the error amp input, logic to insure latched operation, a PWM comparator which also provides current limit control and a totem pole output stage designed to source or sink high peak current. The output stage, suitable for driving N-channel MOSFETs, is low in the off state. Differences between members of this family are the under-voltage lockout thresholds and maximum duty cycle ranges. It is ideally suited to off-line applications.
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- Low start-up current
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- Automatic feed forward compensation
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- Pulse-by-pulse current limiting
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- Enhanced load response characteristics
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- Under-voltage lockout with hysteresis
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- Double pulse suppression
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- High current totem pole output
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- Internally trimmed bandgap reference
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- Low RO Error amplifier
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- Green product and no Sb/Br