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UC2525AN

IC REG CTRLR MULT TOPOLOGY 16DIP

제조업체텍사스 인스트루먼트(주)
제조업체 부품 #UC2525AN
데이터시트 UC2525AN DataSheet
패키지 DIP-16
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사양

속성	가치
Supplier	Texas Instruments
Package	Tube
ProductStatus	Active
OutputType	Transistor Driver
Function	Step-Up, Step-Up/Step-Down
OutputConfiguration	Positive
Topology	Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, Push-Pull
NumberofOutputs	2
OutputPhases	1
Voltage-Supply(Vcc/Vdd)	8V ~ 35V
Frequency-Switching	100Hz ~ 400kHz
DutyCycle(Max)	49%
SynchronousRectifier	Yes
ClockSync	Yes
ControlFeatures	Enable, Frequency Control, Soft Start
OperatingTemperature	-25°C ~ 85°C (TA)
MountingType	Through Hole
Package/Case	16-DIP (0.300, 7.62mm)

개요

Description

UC2525AN is a pulse-width modulation (PWM) controller IC from the Unitrode/TI UC family used in switch‑mode power supplies (SMPS). It integrates the core SMPS control functions needed to regulate output voltage:
- Error amplifier with an internal reference and external feedback/compensation
- Oscillator to set switching frequency (with external RT/CT components)
- PWM comparator and latch/driver to switch a power transistor
- Features such as undervoltage lockout, soft‑start, dead‑time control, and overcurrent protection
External components determine frequency, loop compensation, and startup behavior. Typical applications include offline and DC‑DC SMPS (flyback, forward topologies, etc.) in low‑ to mid‑power supplies. The “AN” suffix generally indicates a specific packaging variant (e.g., 8‑pin DIP/SOIC).

Equivalent

UC2525AN is a TI/Unitrode current‑mode PWM controller. There isn’t an exact pin‑for‑pin drop‑in equivalent. Closest functional substitutes: UC3842/3843/3844 (current‑mode PWM controllers) and TL494 (PWM with error amp). For an exact cross‑reference, use TI’s cross‑reference database and compare pinouts and specs (Vcc, Gnd, Ipk, Osc, FB).

Features

Here are the core features of the UC2525AN (PWM controller for SMPS):
- 8-pin package (DIP-8/SO-8) for ease of use in power supplies
- Current-mode PWM control with a sense input and slope compensation
- Built-in 5V reference and transconductance error amplifier for regulation via optocoupler
- Oscillator frequency set by a single external resistor (typical tens of kHz range)
- Startup current source and undervoltage lockout with hysteresis
- Soft-start to limit inrush and improve stability
- Overcurrent protection (current-limit) with protection latch
- Overtemperature protection and basic fault protection
- Output driver to control an external power MOSFET (gate-drive capability)
- Suitable for flyback, forward, and other SMPS topologies with isolated or non-isolated converters
Notes: For exact electrical specs (voltage ranges, timing, and protection thresholds), consult the official datasheet.

Pinout

- Pin count: 8 pins (DIP-8/SO-8).
- Functions (per UC2525AN):
- Vcc: power supply input
- GND: ground
- OUTPUT: drives the external switching device
- FB (VFB): feedback input for regulation
- COMP: compensation node for the error amplifier
- IS: current-sense/input for current-mode control
- RT/CT: timing network input (oscillator frequency)
- Vref: reference voltage output
Notes: UC2525AN is an 8-pin PWM controller used in switch-mode power supplies; exact pin numbers may vary by package, so check the datasheet for your specific package.

Manufacturer

Manufacturer: Unitrode Corporation (now part of Texas Instruments).
What kind of company: Unitrode was a semiconductor company specializing in analog and mixed-signal integrated circuits, including power-management and PWM/controller ICs for switching power supplies.

Application

- Off-line (mains) AC-DC adapters and supplies
- DC-DC switching regulators for computers, telecom, and consumer electronics
- Topologies: buck, boost, buck-boost, flyback, and forward converters
- Battery chargers and charging adapters
- General-purpose SMPS controllers for low- to mid-power applications (soft-start, current limit, protection features)