UC3842

UC3842 fixed frequency Current Mode PWM Controller - DIP - SMD package DC to DC converter

Shipping Starts from ₹59
SKU: IC-PS-UC3842
MPN: UC3842
Stock Status: 11 pcs
Delivery Status: 3-7 days
₹25.50
Including Tax: ₹3.89
pcs

Description

Product Features

Optimized for off-line and DC-to-DC converters
• Low start-up current (< 1 mA)
• Automatic feedforward compensation
• Pulse-by-pulse current limiting
• Enhanced load-response characteristics
• Undervoltage lockout with hysteresis
• Double-pulse suppression
• High-current totem-pole output
• Internally trimmed bandgap reference
• Up to 500-kHz operation
• Error amplifier with low output resistance

The UCx84x series of control integrated circuits
provide the features that are necessary to implement
off-line or DC-to-DC fixed-frequency current-mode
control schemes, with a minimum number of external
components. The internally implemented circuits
include an undervoltage lockout (UVLO), featuring a
start-up current of less than 1 mA, and a precision
reference trimmed for accuracy at the error amplifier
input. Other internal circuits include logic to ensure
latched operation, a pulse-width modulation (PWM)
comparator that also provides current-limit control,
and a totem-pole output stage that is designed to
source or sink high-peak current. The output stage,
suitable for driving N-channel MOSFETs, is low when
it is in the off state.The UCx84x family offers a variety of package
options, temperature range options, choice of
maximum duty cycle, and choice of turnon and turnoff
thresholds and hysteresis ranges. Devices with
higher turnon or turnoff hysteresis are ideal choices
for off-line power supplies, while the devices with a
narrower hysteresis range are suited for DC-DC
applications. The UC184x devices are specified for
operation from –55°C to 125°C, the UC284x series is
specified for operation from –40°C to 85°C, and the
UC384x series is specified for operation from 0°C to
70°C.

DataSheet:Click Here

Technical Data

Parameters
Topology Boost, Buck, Buck-Boost, Flyback, Forward
Duty cycle (Max) (%) 100
Supply voltage (Max) (V) 28
UVLO thresholds on/off (V) 16/10
Features Adjustable Switching Frequency, Current Limiting, Dead Time Control, Error Amplifier, Multi-topology
Operating temperature range (C) 0 to 70
Rating Catalog
Frequency (Max) (kHz) 500
Gate drive (Typ) (A) 1

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