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UC2842BNG

Name: UC2842BNG
Rating: 4.7 (12 reviews)

IC REG CTRLR BST FLYBK ISO 8-DIP

製造商
製造商。部分 #UC2842BNG
包 8-DIP (0.300, 7.62mm)
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規格

Supplier	onsemi
Package	Tube
ProductStatus	Active
OutputType	Transistor Driver
Function	Step-Up, Step-Up/Step-Down
OutputConfiguration	Positive, Isolation Capable
Topology	Boost, Flyback
NumberofOutputs	1
OutputPhases	1
Voltage-Supply(Vcc/Vdd)	10V ~ 30V
Frequency-Switching	Up to 500kHz
DutyCycle(Max)	96%
SynchronousRectifier	No
ClockSync	No
ControlFeatures	Frequency Control
OperatingTemperature	-25°C ~ 85°C (TA)
MountingType	Through Hole
Package/Case	8-DIP (0.300, 7.62mm)

概述

Description

UC2842BNG is an 8-pin PWM controller IC from the UC2842 family, used to regulate switch‑mode power supplies. It implements current‑mode PWM control with an oscillator, internal reference, and an output stage to drive a power MOSFET. Key features typically include soft‑start, undervoltage lockout, current limit, and the ability to set switching frequency with external RT/CT components. It is designed for offline SMPS topologies (especially flyback/forward) and uses an optocoupler for feedback from the secondary side.
BNG suffix indicates a Pb‑free/RoHS‑compliant variant in a specific package; check the datasheet for exact package type.
Common applications: small offline adapters, power supplies, LED drivers.
For exact electrical specs, pinout, and application circuits, consult the UC2842BNG datasheet.

Features

Key features of UC2842BNG (8-pin, RoHS packaging):
- High-voltage current-mode PWM controller for off-line SMPS (flyback, buck/boost)
- Built-in start-up current source and ability to operate from rectified mains
- 5V reference and transconductance/error amplifier for feedback
- Oscillator with external RT for frequency setting (typical tens of kHz range)
- Peak current-mode control with slope compensation
- UVLO (undervoltage lockout) for reliable startup
- Pulse-by-pulse overcurrent/short-circuit protection with latch
- Soft-start to limit inrush and rise time
- Gate-drive capable output for external power transistor (MOSFET)
- Protection features with latch reset on fault
- Packaging: 8-pin DIP/SOIC variants (BNG indicates RoHS lead-free version)
Note: exact electrical ranges (voltage, frequency) vary by variant; consult the datasheet for your specific part revision.

Package

An 8-pin PDIP (DIP-8) package; RoHS lead-free variant (G suffix).

Pinout

- Pin count: 8 pins (DIP-8 / SOIC-8 package; UC2842BNG is the 8‑pin version).
Pin functions (by pin number):
- 1: COMP – Error amplifier output (compensation node)
- 2: VFB (Feedback) – Inverting input of the error amplifier (receives optocoupler signal)
- 3: IS – Current-sense input (primary current sensing)
- 4: RT/CT – Oscillator timing inputs (set frequency with RT and CT)
- 5: GND – Ground
- 6: Vcc – Supply voltage
- 7: OUT – Output drive for the power switch (to drive MOSFET/transistor)
- 8: Vref – 5V reference output (bias for the error amp/feedback network)
Description: UC2842BNG is a current-mode PWM controller for switch‑mode power supplies, providing fixed frequency operation, error‑amplifier control, current sense, and an output to drive the main switch.

Manufacturer

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

Application

- Isolated off-line SMPS (flyback/forward) for AC-DC adapters, TVs/monitors, printers, and set-top boxes
- Standby/auxiliary power supplies in telecom and data equipment
- Low-to-mid power buck/boost regulator designs
- LED driver circuits requiring current‑mode PWM control

Equivalent

Closest equivalents are from the same PWM controller family:
- UC3842/UC3843 (TI/other vendors) – similar current-mode PWM control and usually pin-compatible in many boards
- Some vendors offer KA3842/KA3843 variants (clones)
Important: pinout, startup current, soft-start, and error-amp behavior can differ. Verify datasheets and adjust PCB or component values as needed for a proper drop-in replacement.