UCC28C43P

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UCC28C43P

IC REG CTRLR MULT TOPOLOGY 8DIP

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Spezifikationen

Supplier Texas Instruments
Package Tube
ProductStatus Obsolete
OutputType Transistor Driver
Function Step-Up, Step-Up/Step-Down
OutputConfiguration Positive
Topology Boost, Flyback, Forward Converter
NumberofOutputs 1
OutputPhases 1
Voltage-Supply(Vcc/Vdd) 7.6V ~ 18V
Frequency-Switching Up to 1MHz
DutyCycle(Max) 96%
SynchronousRectifier No
ClockSync No
ControlFeatures Frequency Control
OperatingTemperature -40°C ~ 105°C (TJ)
MountingType Through Hole
Package/Case 8-DIP (0.300, 7.62mm)

Übersicht

Description

UCC28C43P is a Texas Instruments part from the UCC28C4x family: an 8-pin high‑voltage, current‑mode PWM controller used to build isolated switch‑mode power supplies, especially flyback converters. The “P” suffix indicates the DIP-8 package.
Key points:
- Purpose: to regulate SMPS flyback converters with an external MOSFET.
- Topology: current‑mode PWM control with high‑voltage startup current.
- Feedback: uses an error/feedback network (e.g., optocoupler) to regulate output.
- Protections and features: undervoltage lockout, current limiting, soft‑start, and configurable switching frequency via RT/CT components.
- Typical frequency: tens to hundreds of kHz (set by external RC network).
Common applications: offline adapters, small switch‑mode power supplies, LED drivers, and charger circuits.
If you need exact electrical specs (HV rating, current limit, exact pinout, or timing values), consult the TI UCC28C43P datasheet.

Features

UCC28C43P features (concise):
- Off-line, isolated SMPS controller (flyback/forward topologies) with external MOSFET
- Current-mode PWM with cycle-by-cycle current limiting
- High-voltage startup current source (for direct rectified mains operation)
- Fixed-frequency operation (frequency set by external RT network)
- Undervoltage lockout (with hysteresis)
- Soft-start to limit inrush and voltage stress
- Internal 5V reference and error amplifier input for optocoupler feedback
- Overload/short-circuit protection with auto-restart
- Overtemperature protection
- Plastic DIP-8 package (P suffix)
Note: No integrated power MOSFET; external FET required.

Package

8-pin Plastic DIP (DIP-8) package.

Pinout

- Pin count: 8 pins (DIP-8/SO-8 package, P suffix denotes DIP).
- Function: TI UCC28C43P is a high‑voltage, current‑mode PWM controller for off‑line switch‑mode power supplies. It drives an external MOSFET (no internal FET), and uses an oscillator (RT/CT), a current-sense input (IS), a feedback input (FB) via an optocoupler, and an error‑amplifier output (COMP) for regulation. It also includes VCC power input with UVLO/soft‑start behavior and a reference (VREF) for the control loop.

Manufacturer

- Manufacturer: Texas Instruments (TI).
- Company type: American multinational semiconductor company that designs and manufactures analog and embedded-processing integrated circuits.

Application

- Off-line isolated SMPS (flyback/forward) for AC‑DC adapters and chargers (roughly 5–40 W).
- Non‑isolated compact buck/boost power supplies.
- LED constant‑current driver circuits.
- Telecom/industrial power supplies requiring simple current‑mode PWM with UVLO.

Equivalent

Closest equivalents are:
- UC3842/3843/3844 family (Unitrode/TI)
- KA3842/KA3843/KA3844 family
Other similar options: On Semiconductor NCP1250/NCP1251
Note: pinouts, reference voltages, and startup behavior vary; check datasheets and package compatibility for an exact 1:1 cross.

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