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UC3844BD1R2G

High Performance Current Mode PWM Controller

Manufacturer:

ON Semiconductor, LLC
Mfr.Part #:

UC3844BD1R2G
Datasheet:

UC3844BD1R2G Datasheet (PDF)
Case Outline:

751-07
MSL Temp (°C):

260
Container Type:

REEL
Topology:

Boost, Flyback
EDA/CAD Models:

Request Free CAD Models for UC3844BD1R2G

Email: [email protected]

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UC3844BD1R2G General Description

The UC3844B, UC3845B 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 an oscillator, 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, a latch for single pulse metering, and a flip-flop which blanks the output off every other oscillator cycle, allowing output deadtimes to be programmed from 50% to 70%.

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 UCX844B has UVLO thresholds of 16 V (on) and 10 V (off), ideally suited for off-line converters. The UCX845B 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 Output Switching Frequency
Output Deadtime Adjustable from 50% to 70%
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
Product Category	Switching Controllers	Topology	Boost, Flyback
Number of Outputs	1 Output	Switching Frequency	500 kHz
Duty Cycle - Max	48 %	Input Voltage	15 V
Output Voltage	4.9 V to 5.1 V	Output Current	1 A
Minimum Operating Temperature	0 C	Maximum Operating Temperature	+ 70 C
Mounting Style	SMD/SMT	Fall Time	50 ns
Operating Supply Voltage	30 V	Product Type	Switching Controllers
Rise Time	50 ns	Series	UC3844B
Factory Pack Quantity	2500	Subcategory	PMIC - Power Management ICs
Type	Current Mode PWM Controller	Unit Weight	0.019048 oz