UC2572 Series

Negative output Flyback pulse width modulator

Catalog(4 parts)

Part	Duty Cycle (Max)▲▼	Number of Outputs▲▼	Control Features	Function	Output Phases▲▼	Voltage - Supply (Vcc/Vdd)▲▼	Voltage - Supply (Vcc/Vdd)▲▼	Mounting Type	Frequency - Switching▲▼	Output Configuration	Topology	Output Type	Supplier Device Package	Operating Temperature▲▼	Operating Temperature▲▼	Package / Case▲▼	Package / Case	Package / Case▲▼
Texas Instruments UC2572DG4 Flyback Regulator Negative Output Step-Up/Step-Down DC-DC Controller IC 8-SOIC	0.9200000166893004 ul	1 ul	Current Limit, Ramp	Step-Up/Step-Down	1 ul	4.75 V	30 V	Surface Mount	100000 Hz	Negative	Flyback	Transistor Driver	8-SOIC	85 °C	-40 °C	0.003899999894201755 m	8-SOIC
Texas Instruments UC2572DTR Flyback Regulator Negative Output Step-Up/Step-Down DC-DC Controller IC 8-SOIC	0.9200000166893004 ul	1 ul	Current Limit, Ramp	Step-Up/Step-Down	1 ul	4.75 V	30 V	Surface Mount	100000 Hz	Negative	Flyback	Transistor Driver	8-SOIC	85 °C	-40 °C	0.003899999894201755 m	8-SOIC
Texas Instruments UC2572D Flyback Regulator Negative Output Step-Up/Step-Down DC-DC Controller IC 8-SOIC	0.9200000166893004 ul	1 ul	Current Limit, Ramp	Step-Up/Step-Down	1 ul	4.75 V	30 V	Surface Mount	100000 Hz	Negative	Flyback	Transistor Driver	8-SOIC	85 °C	-40 °C	0.003899999894201755 m	8-SOIC
Texas Instruments UC2572N Flyback Regulator Negative Output Step-Up/Step-Down DC-DC Controller IC 8-PDIP	0.9200000166893004 ul	1 ul	Current Limit, Ramp	Step-Up/Step-Down	1 ul	4.75 V	30 V	Through Hole	100000 Hz	Negative	Flyback	Transistor Driver	8-PDIP	85 °C	-40 °C	0.007619999814778566 m	8-DIP	0.007619999814778566 m

Key Features

• Simple Single Inductor Flyback PWM for Negative Voltage GenerationDrives External PMOS SwitchContains UVLO CircuitIncludes Pulse-by-Pulse Current LimitLow 50uA Sleep Mode CurrentSimple Single Inductor Flyback PWM for Negative Voltage GenerationDrives External PMOS SwitchContains UVLO CircuitIncludes Pulse-by-Pulse Current LimitLow 50uA 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 50uA, making the UC3572 ideal for battery powered applications. 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 50uA, making the UC3572 ideal for battery powered applications.