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ST UC3845B
onsemi ANA SMPS PWM CONTROLLER
Brands: STMicroelectronics, Inc
Mfr.Part #: UC3845B
Datasheet: UC3845B Datasheet (PDF)
Package/Case: SOP-8
RoHS Status:
Stock Condition: 3533 pcs, New Original
Product Type: Integrated Circuits (ICs)
Warranty: 1 Year Ovaga Warranty - Find Out More
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*All prices are in USD
| Qty | Unit Price | Ext Price |
|---|---|---|
| 5 | $0.186 | $0.930 |
| 50 | $0.153 | $7.650 |
| 150 | $0.139 | $20.850 |
| 500 | $0.120 | $60.000 |
| 2500 | $0.094 | $235.000 |
| 5000 | $0.089 | $445.000 |
In Stock:3533 PCS
UC3845B General Description
The UC3845B is a PWM (Pulse-Width Modulation) controller IC, part of the UCx84x family, manufactured by Texas Instruments. It is a versatile PWM controller commonly used in power supply and voltage regulation applications. The UC3845B is designed to provide precise control over the duty cycle and frequency of the output waveform.
Features
Voltage Mode PWM Control: UC3845B operates as a voltage mode PWM controller, regulating the output voltage by adjusting the duty cycle of the output waveform based on input voltage and load conditions.
Adjustable Frequency and Duty Cycle: This IC allows users to adjust both the switching frequency and duty cycle, offering flexibility to optimize the performance of the power supply.
Current Limiting: UC3845B typically includes current limiting features to protect the power supply against overcurrent conditions.
Soft Start: Some versions of the IC may have a soft start function, which gradually ramps up the output voltage during startup to prevent excessive inrush current.
Error Amplifier: The error amplifier within UC3845B compares a feedback voltage (representing the actual output voltage) to a reference voltage, generating an error signal for control.
Under-Voltage Lockout (UVLO): It often includes UVLO circuitry to ensure that the power supply starts and operates only within a specified input voltage range.
Short-Circuit Protection: Some versions may have built-in short-circuit protection to safeguard the power supply from short circuits.
Wide Input Voltage Range: UC3845B is typically capable of operating within a wide input voltage range, making it suitable for various applications.
External Components: To configure UC3845B for a specific application, external components such as resistors, capacitors, and an external power transistor are typically required.
Application
The UC3845B is used in a broad range of applications, including DC-DC converters, AC-DC power supplies, battery chargers, and other power management and voltage regulation applications.
Specifications
| Parameter | Value | Parameter | Value |
|---|---|---|---|
| Product Name | UC3845B | Product Type | Voltage Mode PWM Controller |
| Manufacturer | Various Manufacturers | Number of Channels | 1 |
| Supply Voltage | 7V to 40V | Operating Frequency | Adjustable, typically in the range of 50 kHz to 500 kHz |
| Operating Temperature | 0°C to +70°C | Package / Case | Various packages, including SOIC, PDIP, and more |
| Packaging | Various packaging options | Source Content uid | UC3845B |
| Pbfree Code | Yes | Rohs Code | Yes |
| Part Life Cycle Code | Active | Ihs Manufacturer | STMICROELECTRONICS |
| Part Package Code | DIP | Package Description | PLASTIC, DIP-14 |
| Pin Count | 14 | Reach Compliance Code | compliant |
| ECCN Code | EAR99 | HTS Code | 8542.39.00.01 |
| Analog IC - Other Type | SWITCHING CONTROLLER | Control Mode | CURRENT-MODE |
| Control Technique | PULSE WIDTH MODULATION | Input Voltage-Max | 25 V |
| Input Voltage-Min | 12 V | Input Voltage-Nom | 15 V |
| JESD-30 Code | R-PDIP-T14 | Number of Functions | 1 |
| Number of Terminals | 14 | Operating Temperature-Max | 70 °C |
| Operating Temperature-Min | Output Current-Max | 1 A | |
| Package Body Material | PLASTIC/EPOXY | Package Code | DIP |
| Package Equivalence Code | DIP14,.3 | Package Shape | RECTANGULAR |
| Package Style | IN-LINE | Peak Reflow Temperature (Cel) | NOT SPECIFIED |
| Qualification Status | Not Qualified | Seated Height-Max | 5.1 mm |
| Surface Mount | NO | Switcher Configuration | SINGLE |
| Switching Frequency-Max | 500 kHz | Technology | BIPOLAR |
| Temperature Grade | COMMERCIAL | Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 2.54 mm | Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | NOT SPECIFIED |
Shipping
| Shipping Type | Ship Fee | Lead Time | |
|---|---|---|---|
 |
DHL | $20.00-$40.00 (0.50 KG) | 2-5 days |
 |
Fedex | $20.00-$40.00 (0.50 KG) | 2-5 days |
 |
UPS | $20.00-$40.00 (0.50 KG) | 2-5 days |
 |
TNT | $20.00-$40.00 (0.50 KG) | 2-5 days |
 |
EMS | $20.00-$40.00 (0.50 KG) | 2-5 days |
 |
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 | |
|---|---|---|
 |
Wire Transfer | charge US$30.00 banking fee. |
 |
Paypal | charge 4.0% service fee. |
 |
Credit Card | charge 3.5% service fee. |
 |
Western Union | charge US.00 banking fee. |
 |
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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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 UC3845B chip is a pulse width modulation (pwm) controller commonly used in switching power supplies. it is designed to regulate the output voltage by adjusting the duty cycle of the switching transistor. the chip provides various protection features, such as overcurrent and overvoltage protection. it is versatile and widely used in applications requiring efficient power conversion.
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Equivalent
Some equivalent products of the UC3845B chip, a pwm controller, include tl3844b, uc3844b, and sg3844b, which are also pwm controllers with similar functionality. other alternatives may vary based on specific requirements and application needs. -
Features
The main features of the UC3845B integrated circuit include a voltage reference, high-current totem-pole output stage, oscillator, temperature-compensated reference, precision current sources, error amplifier, and an active current limiting circuitry for fault protection. -
Pinout
The UC3845B is a pulse width modulation (pwm) controller ic. it has 16 pins and the main functions are to regulate the output voltage of a power supply and control the switching of power transistors. -
Manufacturer
UC3845B is a product of texas instruments (ti), an american semiconductor company. ti specializes in designing and manufacturing integrated circuits, which are widely used in various electronic devices. they offer a range of products for different applications, including power management, amplifiers, microcontrollers, and more. -
Application Field
The UC3845B is a pwm controller ic designed for applications in power supplies, motor control, and lighting systems. it is commonly used in offline flyback converters, resonant converters, and forward converters. its features such as adjustable frequency and duty cycle control make it suitable for various power management applications. -
Package
The UC3845B chip is available in a pdip-8 package type, which stands for plastic dual-in-line package with 8 pins. its form is dip (dual in-line package). the package size can vary, but for the pdip-8, the overall size is approximately 10.16mm x 6.35mm.
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