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UC3845D The UC3845D from ON Semiconductor is a high-performance, fixed-frequency, current-mode PWM controller designed for Off-Line and DC-to-DC converter applications. It offers a cost-effective solution with minimal external components.
Mfr Part #:

UC3845D

Available from 1 distributors
Mfr Name: On Semiconductor
On Semiconductor
The UC3845D from ON Semiconductor is a high-performance, fixed-frequency, current-mode PWM controller designed for Off-Line and DC-to-DC converter applications. It offers a cost-effective solution with minimal external components.
✓ Total Stock: 2,094 pcs
$ Price Range: $0.78

UC3845D Available from 1 distributor

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✓ Non-Authorised
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2,094 pcs
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UC3845D Specifications Quick View

Most important parameters for selection – full specs in datasheet.
Category
Manufacturer Name
Clock Sync
Control Features
Duty Cycle (Max)
Frequency
Function
Mounting Type
Number of Outputs
Operating Temperature
Output Configuration
Output Current
Output Phases
Output Type
Supplier Device Package
Supply Voltage
Synchronous Rectifier
Topology
Voltage
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UC3845D Description

Short technical summary and product information.

The UC3845D is a versatile current-mode PWM controller from ON Semiconductor, suitable for both Off-Line and DC-to-DC converter designs. It operates with a fixed frequency up to 500kHz and supports a wide supply voltage range of 7.6V to 30V.

 

Key features include low startup current, UVLO with hysteresis, and a maximum duty cycle clamp. The controller provides precise duty cycle control through a trimmed oscillator and includes a temperature-compensated reference, a high-gain error amplifier, a current sensing comparator, and a high-current totem-pole output for driving power MOSFETs.

 

This device is available in a 14-SOIC package and is designed for surface mounting. It offers a maximum duty cycle of 48% and is ideal for applications requiring efficient power conversion with minimal external components. The operating temperature range is 0°C to 70°C.

 

The UC3845D is designed for applications such as boost, flyback, step-up, and step-down converters. Its robust design and integrated features make it a reliable choice for power management solutions.

UC3845D Quick Information

Product Type: DC DC Switching Controller
Canonical Name: UC3845D Current Mode PWM Controller
Subcategory: Current Mode PWM Controller

UC3845D Compliance

RoHS Status: RoHS Compliant
Moisture Sensitivity Level (MSL): 1 Unlimited
REACH Status: REACH Unaffected

UC3845D Estimated Pricing

Qty Low High
1+ $0.78 $0.78

Estimated market price range - modelled values for guidance only, not live distributor offers.

UC3845D Features

  • Fixed frequency current-mode PWM controller.
  • Operating frequency up to 500kHz.
  • Wide voltage range: 7.6V to 30V.
  • Surface mount 14-SOIC package.
  • Low startup current and UVLO with hysteresis.

UC3845D Applications

  • Ideal for DC-to-DC converters.
  • Suitable for Off-Line power supplies.
  • Used in boost converter designs.
  • Applicable to flyback converter designs.

UC3845D FAQs

6 frequently asked questions generated from this part’s specifications.
What is the supply voltage range of the UC3845D?

The supply voltage range is 7.6V to 30V.

What is the maximum output current?

The output current is ±1A.

What topologies does the UC3845D support?

It supports boost and flyback topologies.

What is the maximum switching frequency?

The maximum switching frequency is 500kHz.

What is the operating temperature range?

The operating temperature range is 0°C to 70°C.

What package is the UC3845D available in?

It is available in a 14-SOIC surface-mount package.

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