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ON UC3844BDG
Boost, Flyback Regulator Positive, Isolation Capable Output Step-Up, Step-Up/Step-Down DC-DC Controller IC 14-SOIC
Brands: ON Semiconductor, LLC
Mfr.Part #: UC3844BDG
Datasheet: UC3844BDG Datasheet (PDF)
Package/Case: SOIC-14
Product Type: Power Management ICs
UC3844BDG General Description
The UC3844B, UC3845B series are high performance fixed frequency current mode controllers. They are specifically designed for Off-Line and dc-to-dc converter applications offering the designer a cost-effective solution with minimal external components. These integrated circuits feature an oscillator, a temperature compensated reference, high gain error amplifier, current sensing comparator, and a high current totem pole output ideally suited for driving a power MOSFET.
Also included are protective features consisting of input and reference undervoltage lockouts each with hysteresis, cycle-by-cycle current limiting, a latch for single pulse metering, and a flip-flop which blanks the output off every other oscillator cycle, allowing output deadtimes to be programmed from 50% to 70%.
These devices are available in an 8-pin dual-in-line and surface mount (SO-8) plastic package as well as the 14-pin plastic surface mount (SO-14). The SO-14 package has separate power and ground pins for the totem pole output stage.
The UCX844B has UVLO thresholds of 16 V (on) and 10 V (off), ideally suited for off-line converters. The UCX845B is tailored for lower voltage applications having UVLO thresholds of 8.5 V (on) and 7.6 V (off).
Features
- Trimmed Oscillator for Precise Frequency Control
- Oscillator Frequency Guaranteed at 250 kHz
- Current Mode Operation to 500 kHz Output Switching Frequency
- Output Deadtime Adjustable from 50% to 70%
- Automatic Feed Forward Compensation
- Latching PWM for Cycle-By-Cycle Current Limiting
- Internally Trimmed Reference with Undervoltage Lockout
- High Current Totem Pole Output
- Undervoltage Lockout with Hysteresis
- Low Startup and Operating Current
- Pb-Free Packages are Available
Application
ONSEMISpecifications
| Parameter | Value | Parameter | Value |
|---|---|---|---|
| Manufacturer: | ON Semiconductor | Product Category: | Switching Controllers |
| RoHS: | Y | Topology: | Boost, Flyback |
| Number of Outputs: | 1 Output | Switching Frequency: | 500 kHz |
| Duty Cycle - Max: | 48 % | Output Current: | 1 A |
| Minimum Operating Temperature: | 0 C | Maximum Operating Temperature: | + 70 C |
| Mounting Style: | SMD/SMT | Package / Case: | SOIC-14 |
| Packaging: | Tube | Series: | UC3844B |
| Type: | Current Mode PWM Controllers | Brand: | ON Semiconductor |
| Fall Time: | 50 ns | Product Type: | Switching Controllers |
| Rise Time: | 50 ns | Factory Pack Quantity: | 55 |
| Subcategory: | PMIC - Power Management ICs | Unit Weight: | 0.011923 oz |
| Tags | UC3844BD, UC3844B, UC3844, UC384, UC38, UC3 |
Shipping
| Shipping Type | Ship Fee | Lead Time | |
|---|---|---|---|
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DHL | $20.00-$40.00 (0.50 KG) | 2-5 days |
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Fedex | $20.00-$40.00 (0.50 KG) | 2-5 days |
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UPS | $20.00-$40.00 (0.50 KG) | 2-5 days |
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TNT | $20.00-$40.00 (0.50 KG) | 2-5 days |
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EMS | $20.00-$40.00 (0.50 KG) | 2-5 days |
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REGISTERED AIR MAIL | $20.00-$40.00 (0.50 KG) | 2-5 days |
Processing Time：Shipping fee depend on different zone and country.
Payment
| Terms of payment | Hand Fee | |
|---|---|---|
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Wire Transfer | charge US$30.00 banking fee. |
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Paypal | charge 4.0% service fee. |
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Credit Card | charge 3.5% service fee. |
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Western Union | charge US.00 banking fee. |
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Money Gram | charge US$0.00 banking fee. |
Guarantees
1.The electronic components you purchase include 365 Days Warranty, We guarantee product quality.
2.If some of the items you received aren't of perfect quality, we would resiponsibly arrange your refund or replacement. But the items must remain their orginal condition.
Packing
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Step1 :Product
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Step2 :Vacuum packaging
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Step3 :Anti-static bag
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Step4 :Individual packaging
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Step5 :Packaging boxes
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Step6 :bar-code shipping tag
All the products will packing in anti-staticbag. Ship with ESD antistatic protection.
Outside ESD packing’s lable will use ourcompany’s information: Part Mumber, Brand and Quantity.
We will inspect all the goods before shipment,ensure all the products at good condition and ensure the parts are new originalmatch datasheet.
After all the goods are ensure no problems afterpacking, we will packing safely and send by global express. It exhibitsexcellent puncture and tear resistance along with good seal integrity.
Part points
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The UC3844BDG chip is a pulse width modulation (PWM) controller used in power supply applications. It operates at a fixed frequency and adjusts the duty cycle of the output signal to regulate the output voltage. It includes features like soft-start, frequency control, and overcurrent protection, making it ideal for offline and DC-DC converters.
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Equivalent
Some equivalent products of the UC3844BDG chip are the UC3844AN, UC3844ADR2G, and UC3844A. These chips are all part of the same family and have similar features and specifications. -
Features
The UC3844BDG is an integrated circuit that features a high-performance voltage mode controller. It operates at a fixed frequency of 50kHz, offers a current sensing and limiting function, and provides overvoltage protection. It also includes a soft-start feature, a temperature-compensated reference, and an adjustable pulse width modulation. -
Pinout
The UC3844BDG is a 14-pin integrated circuit. It is a current mode PWM controller used in switch mode power supplies. -
Manufacturer
The manufacturer of the UC3844BDG is Texas Instruments. It is a semiconductor company that designs and manufactures integrated circuits, including microcontrollers, analog and digital circuits, and power management solutions. -
Application Field
The UC3844BDG is a pulse width modulation (PWM) controller used in various power supply applications, such as switch-mode power supplies (SMPS), battery chargers, and LED drivers. It provides control and regulation of the output voltage, as well as protection features like overvoltage and overcurrent protection. -
Package
The UC3844BDG chip comes in a standard SOIC-8 package type, with a form factor that follows the outline and dimensions set by the Small-Outline Integrated Circuit (SOIC) standard.
Datasheet PDF
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