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See Technical Specifications

UC3842BD1G

a 500khz 8-pin soic n rail current mode pwm controller

Manufacturer:

Onsemi
Mfr.Part #:

UC3842BD1G
Datasheet:

UC3842BD1G Datasheet (PDF)
Compliance:

PbAHP
Case Outline:

751-07
MSL Type:

1
MSL Temp (°C):

260
EDA/CAD Models:

Request Free CAD Models for UC3842BD1G

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UC3842BD1G 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	Lifetime	Compliance	PbAHP
Case Outline	751-07	MSL Type	1
MSL Temp (°C)	260	Container Type	TUBE
Container Qty.	98	ON Target	N
Topology	Flyback	Control Mode	Current Mode
fsw Typ (kHz)	52	Stand-by Mode	No
UVLO (V)	Yes	Short Circuit Protection	Yes
Latch	No	Soft Start	No
VCC Max (V)	30	Drive Cap. (mA)	200 / 200
Pricing ($/Unit)	$0.2495Sample