UC2572N Texas Instruments Integrated Circuit (Other) In Stock
Texas Instruments UC2572 voltage-mode PWM controller for negative output flyback converters operating from 4.75V to 30V supply in 8-pin DIP package. Controls switching frequency and duty cycle for isolated negative rail generation. Available from stock with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Other
- Pin Count
- 8
- Lifecycle
- OBSOLETE
- Datasheet
- UC2572N Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of UC2572N?
- Voltage-mode PWM control optimized for negative output flyback topologies, enabling isolated negative rail generation from a positive supply without external signal inversion circuitry
- 4.75V to 30V wide input supply range with 5V nominal operation, compatible with standard logic-level supplies in telecom, industrial, and analog instrumentation designs
- 8-pin PDIP package with integrated oscillator, error amplifier, and output driver for a compact single-chip flyback PWM controller solution
What is UC2572N used for?
The UC2572N is designed for negative output flyback DC-DC converters used in operational amplifier bias supplies, analog signal processing rails, and telecom line interface circuits requiring isolated negative voltages. Its voltage-mode PWM control allows stable regulation of negative outputs across wide load ranges in off-line and DC-DC isolated converter topologies. Common applications include -5V or -12V rail generation from a positive bus in industrial instruments, audio equipment, and legacy analog system power supplies.
What are the specifications of UC2572N?
| Pbfree Code | No |
| YTEOL | 0 |
| Analog IC - Other Type | SWITCHING CONTROLLER |
| Control Mode | VOLTAGE-MODE |
| Control Technique | PULSE WIDTH MODULATION |
| Input Voltage-Max | 30V |
| Input Voltage-Min | 4.75V |
| Input Voltage-Nom | 5V |
| JESD-30 Code | R-PDIP-T8 |
| JESD-609 Code | e4 |
| Number of Functions | 1 |
| Output Current-Max | 0.7A |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | DIP8,.3 |
| Package Shape | RECTANGULAR |
| Package Style | IN-LINE |
| Qualification Status | Not Qualified |
| Supply Current-Max (Isup) | 15mA |
| Surface Mount | NO |
| Switcher Configuration | SINGLE |
| Switching Frequency-Max | 115kHz |
| Technology | BIPOLAR |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 2.54mm |
| Terminal Position | DUAL |
| Package | Other |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
Where can I find the UC2572N datasheet?
UC2572N Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for UC2572N?
Compatible alternatives and drop-in replacements for UC2572N:
Switching Controller, Voltage-mode, 0.7A, 115kHz Switching Freq-Max, BIPolar, PDIP8
Switching Controller, Voltage-mode, 0.7A, 115kHz Switching Freq-Max, BIPolar, PDIP8
Frequently Asked Questions
What input voltage range does UC2572N support and what topology does it control?
UC2572N operates from a 4.75V minimum to 30V maximum input supply with a 5V nominal bias, controlling voltage-mode PWM in negative output flyback converter topologies. This wide 4.75V to 30V range accommodates a variety of bus voltages in industrial and telecom power systems requiring an isolated negative DC output rail.
For which negative output rail applications is UC2572N the preferred single-chip PWM controller?
UC2572N is preferred for generating isolated negative supply rails such as -5V or -12V in analog instrumentation, op-amp bias networks, and telecom interface circuits. Its voltage-mode flyback control simplifies the design of converters producing negative outputs from a positive DC bus, avoiding the need for charge pumps or inverting regulators in medium-power isolated applications.
How does the voltage-mode control of UC2572N differ from current-mode control in flyback designs?
UC2572N uses voltage-mode PWM where the duty cycle is set directly by the error amplifier output compared to a sawtooth oscillator ramp, without sensing inductor current. This simplifies compensation design in negative flyback converters with light-to-moderate loads, though it requires more careful loop compensation at varying input voltages compared to current-mode controllers operating across a 4.75V to 30V input range.
What package does UC2572N come in, and how does the DIP-8 format affect rework and prototyping?
UC2572N is housed in an 8-pin PDIP through-hole package, making it directly socketed on prototyping boards for quick evaluation and easy replacement during development. The DIP-8 format simplifies manual rework and is compatible with standard 0.3-inch wide IC sockets, reducing development time when iterating on flyback converter designs with variable switching frequencies up to the device's rated maximum.
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Why Buy from FindMyChip
About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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