Mfr Part #:

UC3845AD

Mfr Name: Unitrode

The UC3845AD is a peak current mode PWM controller from Unitrode, featuring a 500kHz switching frequency and a maximum duty cycle of 50%.

✓ Total Stock: 823 pcs

$ Price Range: $0.78

UC3845AD Available from 2 distributors

✓ Authorised

✓ Non-Authorised

Distributor		Stock	Pricing	MOQ	PKG	Lead Time	Date Code	On Order Quantity	On Order Delivery
Bristol Electronics ✓ Non-Authorised Inventory information	820 pcs On Request	820 pcs	On Request	1	On Request	On Request	On Request	On Request	On Request
Partservice ✓ Non-Authorised Inventory information	3 pcs On Request	3 pcs	On Request	1	On Request	On Request	On Request	On Request	On Request

UC3845AD Specifications Quick View

Most important parameters for selection – full specs in datasheet.

SELECT ALL

Category	New Products
Manufacturer Name	Unitrode
Duty Cycle	50%
Features	Adjustable switching frequency, Current limiting, Dead time control, Error amplifier, Fixed frequency, Multi-topology
Operating Temperature	0°C to 70°C
Topology	Boost, Buck, Buck boost, Flyback, Forward

View Similar Products (0)

UC3845AD Description

Short technical summary and product information.

The UC3845AD is a peak current mode PWM controller designed for a variety of DC-DC converter topologies including boost, buck, buck-boost, flyback, and forward converters. It operates at a fixed switching frequency of 500kHz and provides a maximum duty cycle of 50%.

The controller includes an undervoltage lockout (UVLO) with thresholds of 8.4V (start) and 7.6V (stop), and features a low startup current of less than 0.5mA. The trimmed oscillator discharge current is 8.3mA, and the output stage can sink at least 10mA during UVLO.

The UC3845AD is available in SOIC (D) and PDIP (P) packages and is rated for an operating temperature range of 0°C to 70°C.

UC3845AD Quick Information

Product Type: DC-DC Switching Controller

Canonical Name: UC3845AD Peak Current Mode PWM Controller

Subcategory: DC-DC Switching Controllers

UC3845AD Compliance

RoHS Status: RoHS Compliant

Moisture Sensitivity Level (MSL): 1 Unlimited

REACH Status: REACH Unaffected

UC3845AD Estimated Pricing

Qty	Low	High
1+	$0.78	$0.78

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

UC3845AD Features

Peak current mode control operation.
Fixed 500kHz switching frequency.
Maximum duty cycle of 50%.
Low startup current under 0.5mA.
Supports boost, buck, flyback topologies.

UC3845AD Applications

Used in off-line AC-DC power supplies.
Ideal for DC-DC converter modules.
Suitable for battery charger circuits.
Applicable in telecom power systems.

UC3845AD FAQs

5 frequently asked questions generated from this part’s specifications.

What is the switching frequency of the UC3845AD?

The switching frequency is 500kHz.

What is the maximum duty cycle of the UC3845AD?

The maximum duty cycle is 50%.

What is the operating temperature range of the UC3845AD?

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

What topologies does the UC3845AD support?

It supports boost, buck, buck-boost, flyback, and forward topologies.

What is the undervoltage lockout (UVLO) threshold of the UC3845AD?

The UVLO thresholds are 8.4V for startup and 7.6V for shutdown.

UC3845AD Alternate Parts

Same form/fit/function or matching attribute configuration across different manufacturers.

View All Alternate Parts

UC3845AN

Texas Instruments

The Texas Instruments UC3845AN is a peak current mode PWM controller designed for efficient power management. It features a switching frequency up to 500kHz and a maximum duty cycle of 50%.

View Part