UC2845BN STMicroelectronics Integrated Circuit (Dual-In-Line Packages) In Stock
STMicroelectronics UC2845BN is a current-mode PWM switching controller in DIP-8 package, operating from 8.2 V to 30 V input. Features programmable oscillator and overcurrent protection. Available from stock worldwide.
- Manufacturer
- STMicroelectronics
- Package
- Dual-In-Line Packages
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- UC2845BN Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.3110(MOQ 50)
- Temp Range
- -25.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Current-mode PWM control with cycle-by-cycle current limiting for inherent short-circuit protection in SMPS designs
- Wide input voltage range of 8.2 V to 30 V with 15 V nominal, suitable for off-line and DC-DC converter topologies
- Totem-pole gate drive output capable of 1 A peak current, enabling direct drive of power MOSFETs without external buffer
Applications
The UC2845BN is a classic current-mode PWM controller used in flyback, forward, and boost SMPS converters operating at frequencies up to 500 kHz. Its 8.2 V to 30 V supply range and 1 A gate drive output make it suitable for AC-DC adapters, industrial power supplies, and battery chargers requiring tight output regulation. The DIP-8 package allows easy prototyping and repair in lab environments and legacy industrial equipment.
Specifications
| Factory Lead Time | 14Weeks |
| YTEOL | 6 |
| Analog IC - Other Type | SWITCHING CONTROLLER |
| Control Mode | CURRENT-MODE |
| Control Technique | PULSE WIDTH MODULATION |
| Input Voltage-Max | 30V |
| Input Voltage-Min | 8.2V |
| Input Voltage-Nom | 15V |
| JESD-30 Code | R-PDIP-T8 |
| JESD-609 Code | e3 |
| Number of Functions | 1 |
| Output Current-Max | 1A |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | DIP8,.3 |
| Package Shape | RECTANGULAR |
| Package Style | IN-LINE |
| Qualification Status | Not Qualified |
| Surface Mount | NO |
| Switcher Configuration | SINGLE |
| Switching Frequency-Max | 500kHz |
| Technology | BIPOLAR |
| Temperature Grade | COMMERCIAL EXTENDED |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 2.54mm |
| Terminal Position | DUAL |
| Package | Dual-In-Line Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
| Country of Origin | Mainland China |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What switching frequency range can be set on the UC2845BN and how is it programmed?
The UC2845BN supports oscillator frequencies from below 1 kHz up to approximately 500 kHz, set by an external resistor-capacitor network on the RT and CT pins. A typical design targeting 100 kHz uses RT = 10 kΩ and CT = 1 nF, and the duty cycle is fixed at a maximum of 50% by the internal latch in current-mode operation.
How does the current-mode control of the UC2845BN improve transient response compared to voltage-mode PWM controllers?
Current-mode control in the UC2845BN senses the inductor or primary current on a cycle-by-cycle basis, allowing the controller to respond to load transients within a single 1 µs to 10 µs switching cycle. This inherently compensates for input voltage variation and reduces the need for complex voltage-loop compensation networks compared to voltage-mode PWM controllers.
For a 30 W flyback converter, what makes the UC2845BN DIP-8 package suitable for prototyping and small-run production?
The DIP-8 format allows direct insertion into breadboards and sockets, enabling rapid component swaps during prototype debugging without soldering. For small-run production of 30 W flyback adapters, through-hole assembly requires no specialized SMT placement equipment, reducing tooling cost by eliminating stencil printing for the controller stage on boards with mixed SMT and through-hole components.
When does the UC2845BN's undervoltage lockout circuit activate, and how does it protect the power supply?
The UC2845BN features UVLO with a turn-on threshold of approximately 16 V and a hysteresis of 8 V, meaning it starts switching at 16 V and shuts off only when the supply drops below 8.2 V. This hysteresis prevents erratic start-stop cycling during slow power-up ramps and ensures the gate drive output delivers a full 1 A peak only when the bias supply is stable.
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About STMicroelectronics
STMicroelectronics is a global semiconductor leader serving customers across the spectrum of electronics applications. ST's products are found in a wide range of applications including automotive, industrial, personal electronics, and communications.
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 50+ | $0.5250 | $26.25 |
| 250+ | $0.5050 | $126.25 |
| 1000+ | $0.3173 | $317.30 |
| 2500+ | $0.3141 | $785.25 |
| 5000+ | $0.3110 | $1555.00 |
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