UC2825AQDWREP

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UC2825AQDWREP

IC REG CTRLR MULT TOP 16SOIC

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사양

Supplier Texas Instruments
Package Tape & Reel (TR),Cut Tape (CT)
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) 8.4V ~ 22V
Frequency-Switching 400kHz ~ 1MHz
DutyCycle(Max) 85%
SynchronousRectifier No
ClockSync No
ControlFeatures Current Limit, Frequency Control, Ramp, Soft Start
OperatingTemperature -40°C ~ 125°C (TJ)
MountingType Surface Mount
Package/Case 16-SOIC (0.295, 7.50mm Width)

개요

Description

UC2825AQDWREP is a UC2825A fixed‑frequency, current‑mode PWM controller IC from Texas Instruments (Unitrode) for switch‑mode power supplies. It is used to regulate output by driving an external switching transistor (MOSFET or BJT) and sensing current through a power path.
Key features (typical): built‑in reference and error amplifier for feedback, undervoltage lockout, cycle‑by‑cycle current limit with slope compensation, soft‑start, and protection against short circuits/overloads. It supports standard SMPS topologies such as flyback, forward, and various DC‑DC converters.
The “AQDWREP” suffix denotes the exact packaging/options for this part (e.g., RoHS/compliance and reel packaging), not the functional behavior. In short, UC2825AQDWREP is a controller IC that enables regulation of switching converters with external power devices and feedback, suitable for offline and DC‑DC SMPS designs.

Features

Here are the key features of UC2825AQDWREP (current-mode PWM controller for SMPS):
- Fixed-frequency, current-mode PWM controller for flyback/forward converters
- External components set oscillator frequency (RT/CT) and enable slope compensation
- Internal 5V reference with transconductance/error amplifier and external compensation network
- Peak current limit with a current-sense input
- UVLO (undervoltage lockout) and thermal shutdown protections
- Short-circuit/overload protection with latch or hiccup behavior
- Soft-start and controllable output enable/disable
- Gate drive output for external switching device (MOSFET/BJT)
- Feedback via optocoupler or error amplifier input; supports standard SMPS feedback loop
- Suitable for wide-range input and various topologies (e.g., flyback, forward)
- Automotive-grade variant (AQ) with extended temp range and QC/qualification options (as applicable)
Note: exact protection modes (hiccup vs latch) and flavor of automotive qualification depend on the specific die/package variant.

Package

It comes in an 8-pin wide SOIC package (SOIC-8), Tape & Reel packaging.

Pinout

- Pin count: 8 pins (8-pin package, e.g., SOIC/DW with Tape & Reel option).
- Function: UC2825AQDWREP is a primary-side, fixed-frequency current-mode PWM controller for offline switch-mode power supplies. It drives an external power transistor and provides a 5V reference, error amplifier, and oscillator.
- Typical pinout (8 pins):
- 1: COMP (error amplifier output)
- 2: VFB (feedback input)
- 3: IS (current-sense input)
- 4: RT/CT (timing resistor/capacitor)
- 5: GND
- 6: OUTPUT (drive to external MOSFET)
- 7: VCC (supply)
- 8: VREF (5V reference)

Manufacturer

Manufacturer: Texas Instruments (TI).
TI is a global semiconductor company that designs and manufactures analog and mixed-signal integrated circuits, including power-management and PWM controller ICs used in switch-mode power supplies.

Application

UC2825AQDWREP is a fixed‑frequency current‑mode PWM controller for switch‑mode power supplies. Typical applications include:
- Offline/universal-input AC‑DC and isolated DC‑DC supplies
- Isolated flyback and forward converter topologies (TVs, monitors, set‑top boxes, battery chargers)
- Non‑isolated DC‑DC converters in consumer/telecom gear
- Constant‑current LED driver applications
- General low‑to‑medium power SMPS requiring startup, UVLO, current limit and protection features.

Equivalent

There isn’t an exact drop-in drop-in replacement for the UC2825A. Closest equivalents (same family/architecture) are:
- TI UC3842 / UC3843 / UC3844 (current‑mode PWM controllers)
- On Semiconductor NCP1250 / NCP1251 (and similar NCP1200 family)
Note: check pinout, startup/UVLO, frequency, and duty-cycle specs. For an exact cross-reference, use TI’s cross-reference tool or contact TI.

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