UC2844BDG ON Semiconductor, UC2844BDG Datasheet

UC2844BDG

Manufacturer Part Number

UC2844BDG

Description

Manufacturer

ON Semiconductor

Datasheet

1.UC3844BVNGUC3845BD.pdf (19 pages)

Specifications of UC2844BDG

Package

SOP14

Date_code

09+

Current page: 1 of 19
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UC3844B, UC3845B,

UC2844B, UC2845B

High Performance

Current Mode Controllers

current mode controllers. They are specifically designed for Off-Line

and dc-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.

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%.

mount (SOIC-8) plastic package as well as the 14-pin plastic surface

mount (SOIC-14). The SOIC-14 package has separate power and

ground pins for the totem pole output stage.

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).

Features

•

Compensation

September, 2007 - Rev. 8

The UC3844B, UC3845B series are high performance fixed frequency

Also included are protective features consisting of input and reference

These devices are available in an 8-pin dual-in-line and surface

The UCX844B has UVLO thresholds of 16 V (on) and 10 V (off),

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

Feedback

Voltage

Output/

Input

ref

8(14)

4(7)

2(3)

1(1)

Amplifier

Pin numbers in parenthesis are for the D suffix SOIC-14 package.

Error

Figure 1. Simplified Block Diagram

Oscillator

Undervoltage

GND

Lockout

ref

5(9)

Reference

5.0V

Latching

PWM

Undervoltage

Lockout

7(12)

7(11)

6(10)

5(8)

3(5)

Output

Power

Ground

Current

Sense Input

See detailed ordering and shipping information in the package

dimensions section on page 15 of this data sheet.

See general marking information in the device marking

section on page 16 of this data sheet.

DEVICE MARKING INFORMATION

Voltage Feedback

Compensation

Current Sense

Compensation

Current Sense

ORDERING INFORMATION

http://onsemi.com

PIN CONNECTIONS

(Top View)

Publication Order Number:

CASE 751A

D1 SUFFIX

CASE 626

CASE 751

N SUFFIX

D SUFFIX

SOIC-14

SOIC-8

PDIP-8

Output

GND

Power Ground

ref

UC3844B/D

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