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UC3846N

Dual-ended 500kHz current mode PWM controller, 500mA totem-pole outputs, 50% max duty cycle

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Manufacturer Part：

UC3846N

Package：

PDIP-16 (19.3 x 6.35 x 4.57 mm)

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Description

Product Overview

The UC3846N from Texas Instruments is a dual-ended current mode PWM controller operating at up to 500 kHz. Housed in a 16-pin PDIP package, it provides all necessary features for fixed-frequency current-mode control schemes with minimal external components. The device features dual totem-pole outputs capable of 500 mA peak, making it suitable for Boost, Flyback, Forward, Half-Bridge, and Push-Pull topologies.

Key Specifications

Topology Boost, Flyback, Forward, Half-Bridge, Push-Pull
Switching Frequency Up to 500 kHz
Max Duty Cycle 50%
Output Peak Current 500 mA (totem-pole)
Supply Voltage Range 7.7 V to 40 V
Reference Voltage 5.1 V (±1%)
Quiescent Current 17 mA
Operating Temperature 0°C to 70°C
Package 16-Pin PDIP

Features

  • Automatic feedforward compensation
  • Programmable pulse-by-pulse current limiting
  • Automatic symmetry correction in push-pull configuration
  • Differential current sense amplifier with wide common mode range
  • Double-pulse suppression
  • Undervoltage lockout (UVLO)
  • Soft-start capability
  • Shutdown terminal with latch-off option

Applications

  • Switch-mode power supplies (SMPS)
  • Push-pull and half-bridge converters
  • Battery charger circuits
  • DC-DC converter modules
  • Industrial power systems

The UC3846N is a member of the UC1846/7 family of current mode PWM controllers from Texas Instruments. Designed for dual-ended power converter topologies, it integrates a differential current sense amplifier, an error amplifier, an oscillator with synchronization capability, and dual totem-pole output stages. The current mode control architecture provides improved line regulation, enhanced load response, and a simpler control loop design compared to voltage mode control. The device is optimized for push-pull, half-bridge, and bridge converter applications where automatic symmetry correction and pulse-by-pulse current limiting are critical for reliable operation.

The UC3846N operates using current mode control where the output inductor current is sensed and used as the feedback variable. The oscillator generates a clock signal that sets the switching frequency (up to 500 kHz). The error amplifier compares a scaled version of the output voltage with the internal 5.1 V reference, producing a control voltage. The current sense amplifier measures the inductor current through a differential input. The PWM comparator compares the current sense signal against the error amplifier output to determine the pulse width. Dual totem-pole outputs alternate based on a flip-flop, driving external power switches in push-pull or bridge configurations. Built-in UVLO ensures the device only operates when the supply voltage exceeds 7.7 V.

Pin Name Type Function
1 C/S+ Input Current sense non-inverting input
2 C/S- Input Current sense inverting input
3 COMP I/O Error amplifier output / PWM comparator input
4 VREF Output 5.1V reference output
5 RT I/O Oscillator timing resistor
6 CT I/O Oscillator timing capacitor
7 SYNC I/O Oscillator synchronization
8 A OUT Output Output A (totem-pole)
9 GND Power Ground
10 B OUT Output Output B (totem-pole)
11 VC Power Output stage supply voltage
12 VIN Power Input supply voltage
13 SHUTDOWN Input Shutdown control
14 E/A+ Input Error amplifier non-inverting input
15 E/A- Input Error amplifier inverting input
16 SOFT START I/O Soft-start capacitor connection
  • Push-pull DC-DC converters for telecom power supplies
  • Half-bridge converters for industrial power systems
  • Battery chargers with current limiting requirements
  • Modular power supply systems requiring parallel operation
  • Offline flyback converters with current mode control
Manufacturer Part Number Package Notes
Texas Instruments UC3846DW SOIC-16 SMD version of UC3846N
Texas Instruments UC3847N PDIP-16 High outputs in OFF state variant
onsemi UC3846N PDIP-16 Pin-compatible equivalent
Texas Instruments UC2846N PDIP-16 Extended temp range (-40 to 85°C)
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We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Shipping & Payment

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Service & Packaging

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

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