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UC3573 датащи(PDF) 1 Page - Texas Instruments

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номер детали UC3573
подробное описание детали  Buck Pulse Width Modulator Stepdown Voltage Regulator
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производитель  TI [Texas Instruments]
домашняя страница  http://www.ti.com
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UC3573 датащи(HTML) 1 Page - Texas Instruments

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UC1573
UC2573
UC3573
DESCRIPTION
The UC3573 is a Buck pulse width modulator which steps down and regu-
lates a positive input voltage. The chip is optimized for use in a single in-
ductor buck switching converter employing an external PMOS switch. The
block diagram consists of a precision reference, an error amplifier config-
ured for voltage mode operation, an oscillator, a PWM comparator with
latching logic, and a 0.5A peak gate driver. The UC3573 includes an
undervoltage lockout circuit to insure sufficient input supply voltage is pres-
ent before any switching activity can occur, and a pulse-by-pulse current
limit. Input current can be sensed and limited to a user determined maxi-
mum value. In addition, a sleep comparator interfaces to the UVLO circuit
which turns the chip off when the input voltage is below the UVLO thresh-
old. This reduces the supply current to only 50
µA, making the UC3573
ideal for battery powered applications.
Buck Pulse Width Modulator Stepdown Voltage Regulator
FEATURES
• Simple Single Inductor Buck PWM
Stepdown Voltage Regulation
• Drives External PMOS Switch
• Contains UVLO Circuit
• Includes Pulse-by-Pulse Current Limit
• Low 50µA Sleep Mode Current
SLUS346 - APRIL 1999
BLOCK DIAGRAM
UDG-94106-1


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