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UC3572DTR датащи(PDF) 1 Page - Texas Instruments

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номер детали UC3572DTR
подробное описание детали  Negative Output Flyback Pulse Width Modulator
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производитель  TI1 [Texas Instruments]
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UC3572DTR датащи(HTML) 1 Page - Texas Instruments

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UC1572
UC2572
UC3572
DESCRIPTION
The UC3572 is a negative output flyback pulse width modulator which con-
verts a positive input voltage to a regulated negative output voltage. The
chip is optimized for use in a single inductor negative flyback switching con-
verter employing an external PMOS switch. The block diagram consists of
a precision reference, an error amplifier configured for voltage mode opera-
tion, an oscillator, a PWM comparator with latching logic, and a 0.5A peak
gate driver. The UC3572 includes an undervoltage lockout circuit to insure
sufficient input supply voltage is present before any switching activity can
occur, and a pulse-by-pulse current limit. Output current can be sensed and
limited to a user determined maximum value. The UVLO circuit turns the
chip off when the input voltage is below the UVLO threshold. In addition, a
sleep comparator interfaces to the UVLO circuit to turn the chip off. This re-
duces the supply current to only 50
µA, making the UC3572 ideal for battery
powered applications.
Negative Output Flyback Pulse Width Modulator
FEATURES
• Simple Single Inductor Flyback PWM
for Negative Voltage Generation
• Drives External PMOS Switch
• Contains UVLO Circuit
• Includes Pulse-by-Pulse Current Limit
• Low 50µA Sleep Mode Current
SLUS275A - MARCH 1999 - REVISED AUGUST 2001
BLOCK DIAGRAM
UDG-94094-2


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