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UC3844AD8TR
+BOMIC REG CTRLR PWM CM 8SOIC
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제조업체텍사스 인스트루먼트(주)
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제조업체 부품 #UC3844AD8TR
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데이터시트 UC3844AD8TR DataSheet
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패키지 SOIC-8
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재고8596
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사양
| 속성 | 가치 |
| Supplier | Texas Instruments |
| Package | Tape & Reel (TR),Cut Tape (CT) |
| ProductStatus | Active |
| OutputType | Transistor Driver |
| Function | Step-Up, Step-Down, Step-Up/Step-Down |
| OutputConfiguration | Positive, Isolation Capable |
| Topology | Boost, Buck, Flyback, Forward |
| NumberofOutputs | 1 |
| OutputPhases | 1 |
| Voltage-Supply(Vcc/Vdd) | 10V ~ 30V |
| Frequency-Switching | Up to 500kHz |
| DutyCycle(Max) | 48% |
| SynchronousRectifier | No |
| ClockSync | No |
| ControlFeatures | Frequency Control |
| OperatingTemperature | 0°C ~ 70°C (TA) |
| MountingType | Surface Mount |
| Package/Case | 8-SOIC (0.154, 3.90mm Width) |
개요
Description
- Internal 5V reference and error-amplifier input for feedback via optocoupler.
- Fixed oscillator frequency (20–60 kHz typical) set with RT/CT; supports slope compensation for stable current-mode control.
- Protections: undervoltage lockout and cycle-by-cycle current limit.
- Output stage typically open-collector/drain to drive the external MOSFET gate (requires pull-up).
- Operates from a DC input (bus) and includes startup current to Vcc; suited for flyback, forward, buck/boost topologies.
- AD8TR denotes a specific revision and 8-pin package with Tape & Reel packaging.
In short, it’s a versatile, widely used PWM controller for SMPS with built‑in reference, protections, and simple external components.
Equivalent
- UC3842, UC3843, UC3845 (TI family)
- KA3842, KA3844 (Samsung/Korea clones)
- SG6842, SG6844 (Sanken clones)
- NCP1200/NCP1250 (ON Semiconductor)
Note: check pinout and precise specs; not all substitutes are drop-in in every design.
Features
- Fixed-frequency, current‑mode PWM suitable for flyback, forward, and other DC‑DC converters.
- Frequency set by RT/CT network; programmable typically around 25–60 kHz (range depends on external parts).
- Input supply range 4.5–40 V with undervoltage lockout (UVLO) for reliable startup/shutdown.
- Internal 5 V reference and error amplifier with COMP/FB pins for optocoupler feedback and external compensation.
- Cycle‑by‑cycle current limit via the sense input for primary current protection.
- Gate‑drive output capable of switching a power MOSFET (sourcing/sinking drive current).
- Built‑in soft‑start to reduce inrush and output overshoot.
- Protection features including UVLO and current limiting; suitable for robust offline/DC‑DC designs.
- Available in 8-pin packages (e.g., AD8TR).
Pinout
- Function: An off-line current‑mode PWM controller for switch‑mode power supplies (e.g., flyback/buck). It provides a 5V reference, error‑amp input, current‑sense input, oscillator/timing (RT/CT), compensation, and an output to drive a power MOSFET (with undervoltage lockout).
Manufacturer
What kind of company: TI is an American multinational semiconductor company that designs and manufactures integrated circuits and related products, specializing in analog and mixed-signal ICs, power management, DSPs, and embedded processing.
Application
- Flyback, forward, buck, boost, and buck-boost converters
- Off-line AC-DC adapters and power supplies
- Isolated and non-isolated DC-DC converters
- Telecom, computer peripherals, battery chargers, LED drivers, and industrial power supplies
Key features enabling simple regulation with opto-coupler feedback: undervoltage lockout, current limit, soft-start, and protective functions.
