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UC3572 Datasheet

Part Number UC3572
Manufacturers Unitrode
Logo Unitrode
Description Negative Output Flyback Pulse Width Modulator
Datasheet UC3572 DatasheetUC3572 Datasheet (PDF)

Negative Output Flyback Pulse Width Modulator UC1572 UC2572 UC3572 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 DESCRIPTION The UC3572 is a negative output flyback pulse width modulator which converts a positive input voltage to a regulated negative output voltage. The chip is optimized for use in a single inductor negative flyback switch.

  UC3572   UC3572






Part Number UC3578
Manufacturers Unitrode
Logo Unitrode
Description Buck Pulse Width Modulator Stepdown Voltage Regulator
Datasheet UC3572 DatasheetUC3578 Datasheet (PDF)

Not Recommended for New Designs application INFO available Buck Pulse Width Modulator Stepdown Voltage Regulator UC2578 UC3578 FEATURES • Provides Simple Single Inductor Buck PWM Step-Down Voltage Regulation • Drives External High Side NMOS Switch • 14V to 72V Input Voltage Operating Range • Contains 100kHz Internal Oscillator, 2V Reference and UVLO • Soft Start on Power Up • Overcurrent Shutdown Followed by Soft Start DESCRIPTION The UC3578 is a PWM controller with an integrated high side .

  UC3572   UC3572







Part Number UC3573
Manufacturers Unitrode
Logo Unitrode
Description Buck Pulse Width Modulator Stepdown Voltage Regulator
Datasheet UC3572 DatasheetUC3573 Datasheet (PDF)

PACKAGE OPTION ADDENDUM www.ti.com 24-Aug-2018 PACKAGING INFORMATION Orderable Device UC2573D UC2573DG4 UC2573DTR UC3573D UC3573DTR Status Package Type Package Pins Package Eco Plan (1) Drawing Qty (2) ACTIVE SOIC D 8 75 Green (RoHS & no Sb/Br) ACTIVE SOIC D 8 75 Green (RoHS & no Sb/Br) ACTIVE SOIC D 8 2500 Green (RoHS & no Sb/Br) ACTIVE SOIC D 8 75 Green (RoHS & no Sb/Br) ACTIVE SOIC D 8 2500 Green (RoHS & no Sb/Br) Lead/Ball Finish (6) CU NIPDAU CU NIPDAU CU NIPDAU CU NIPD.

  UC3572   UC3572







Negative Output Flyback Pulse Width Modulator

Negative Output Flyback Pulse Width Modulator UC1572 UC2572 UC3572 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 DESCRIPTION The UC3572 is a negative output flyback pulse width modulator which converts a positive input voltage to a regulated negative output voltage. The chip is optimized for use in a single inductor negative flyback switching converter employing an external PMOS switch. The block diagram consists of a precision reference, an error amplifier configured for voltage mode operation, 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 reduces the supply current to only 50µA, making the UC3572 ideal for battery powered applications. BLOCK DIAGRAM SLUS275A - MARCH 1999 - REVISED AUGUST 2001 UDG-94094-2 ABSOLUTE MAXIMUM RATINGS VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35V EAINV . . . . . . . . . . . ..


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