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UC3842BD1R2G

High Performance Current Mode PWM Controller

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UC3842BD1R2G General Description

The UC3842B, UC3843B series are high performance fixed frequency current mode controllers. They are specifically designed for Off-Line and dc-to-dc converter applications offering the designer a cost-effective solution with minimal external components. These integrated circuits feature a trimmed oscillator for precise duty cycle control, a temperature compensated reference, high gain error amplifier, current sensing comparator, and a high current totem pole output ideally suited for driving a power MOSFET.

Also included are protective features consisting of input and reference undervoltage lockouts each with hysteresis, cycle-by-cycle current limiting, programmable output deadtime, and a latch for single pulse metering.

These devices are available in an 8-pin dual-in-line and surface mount (SO-8) plastic package as well as the 14-pin plastic surface mount (SO-14). The SO-14 package has separate power and ground pins for the totem pole output stage.

The UCX842B has UVLO thresholds of 16 V (on) and 10 V (off), ideally suited for off-line converters. The UCX843B is tailored for lower voltage applications having UVLO thresholds of 8.5 V (on) and 7.6 V (off).

Key Features

  • Trimmed Oscillator for Precise Frequency Control
  • Oscillator Frequency Guaranteed at 250 kHz
  • Current Mode Operation to 500 kHz
  • Automatic Feed Forward Compensation
  • Latching PWM for Cycle-By-Cycle Current Limiting
  • Internally Trimmed Reference with Undervoltage Lockout
  • High Current Totem Pole Output
  • Undervoltage Lockout with Hysteresis
  • Low Startup and Operating Current
  • Pb-Free Packages are Available

Specifications

Status Active Case Outline 751-07
MSL Temp (°C) 260 Container Type REEL

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AVAQ determines and packages all devices based on electrostatic discharge (ESD) and moisture sensitivity level (MSL) protection requirements.

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Ratings and Reviews

More
I
I**h 05/12/2022

Works well. The maximum load on the USB output is 1.5A.

7
S
S**a 01/19/2021

Burned one... but they are in order 5 so two are already working for glory

17
M
M**h 01/17/2021

All right. all right. All right. And i'm glad.

10
L
L**m 09/25/2020

i have ordered 20 pcs, one item was defektive, another 2 with around 20 BB each, could be better.

1

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UC3842BD1R2G Datasheet PDF

Preliminary Specification UC3842BD1R2G PDF Download

UC3842BD1R2G PDF Preview

Availability: 7253 PCS

+BOM
Qty. Unit Price Ext. Price
1+ $0.395 $0.40
10+ $0.321 $3.21
30+ $0.291 $8.73
100+ $0.250 $25.00
500+ $0.202 $101.00
1000+ $0.192 $192.00

The prices below are for reference only.

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