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UC3845N The Unitrode UC3845N is a 500kHz current mode PWM controller designed for off-line and DC-to-DC converters. It operates with a 50% duty cycle and features undervoltage lockout.
Mfr Part #:

UC3845N

Available from 2 distributors
Mfr Name: Unitrode
Unitrode
The Unitrode UC3845N is a 500kHz current mode PWM controller designed for off-line and DC-to-DC converters. It operates with a 50% duty cycle and features undervoltage lockout.
✓ Total Stock: 74 pcs
$ Price Range: $0.85

UC3845N 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
49 pcs
On Request
49 pcs On Request 1 On Request On Request On Request On Request On Request
Partservice ✓
Non-Authorised Inventory information
25 pcs
On Request
25 pcs On Request 1 On Request On Request On Request On Request On Request
DistyParts aggregates offers from multiple distributors. Final prices, lead times and terms are subject to the distributors' discretion and may change without prior notice. DistyParts is not liable for any discrepancies.

UC3845N Specifications Quick View

Most important parameters for selection – full specs in datasheet.
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UC3845N Description

Short technical summary and product information.

The UC3845N from Unitrode is a high-performance, fixed-frequency current-mode Pulse Width Modulation (PWM) controller. It is optimized for off-line and DC-to-DC converter applications, requiring a minimal number of external components for implementation.

 

Key electrical specifications include an operating frequency of up to 500kHz, a 50% maximum duty cycle, and an undervoltage lockout (UVLO) with hysteresis set at 8.4V/7.6V. It also features a low start-up current of less than 1mA and a high-current totem-pole output stage designed for driving N-channel MOSFETs.

 

This controller integrates essential circuits such as automatic feedforward compensation, pulse-by-pulse current limiting, and double-pulse suppression. The error amplifier has low output resistance, contributing to enhanced load-response characteristics.

 

The UC3845N is available in an 8-pin PDIP package, suitable for through-hole mounting. It operates within a temperature range of 0°C to 70°C. The standard package quantity is 50 units per tube.

UC3845N Quick Information

Product Type: DC DC Switching Controller
Series: UC3845
Canonical Name: UC3845N Current Mode PWM Controller
Subcategory: DC DC Switching Controllers

UC3845N Compliance

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

UC3845N Estimated Pricing

Qty Low High
1+ $0.85 $0.85

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

UC3845N Features

  • 500kHz current mode PWM controller.
  • Low start-up current less than 1mA.
  • 8.4V/7.6V undervoltage lockout.
  • High-current totem-pole output.
  • Optimized for DC-to-DC converters.

UC3845N Applications

  • Used in off-line converters.
  • Suitable for DC-to-DC applications.
  • Ideal for power supply designs.
  • Drives N-channel MOSFETs.

UC3845N FAQs

7 frequently asked questions generated from this part’s specifications.
What is the operating temperature range of the UC3845N?

The UC3845N operates over a temperature range of 0°C to 70°C.

What package is the UC3845N available in?

The UC3845N is available in an 8-pin PDIP package.

What is the switching frequency of the UC3845N?

The UC3845N operates at a switching frequency of 500 kHz.

What is the undervoltage lockout (UVLO) threshold of the UC3845N?

The UVLO threshold is 8.4V for startup and 7.6V for shutdown.

What is the start-up current of the UC3845N?

The start-up current is less than 1mA.

What is the duty cycle of the UC3845N?

The UC3845N has a 50% duty cycle.

What type of output does the UC3845N provide?

The UC3845N provides a high-current totem-pole output.

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