UC3844BNG ON Semiconductor, UC3844BNG Datasheet

UC3844BNG

Manufacturer Part Number

UC3844BNG

Description

IC CTLR CURRENT MODE 8-DIP

Manufacturer

ON Semiconductor

Type

Pulse Width Modulator Controllerr

Datasheets

1.UC3844BDR2G.pdf (19 pages)

2.UC3844BNG.pdf (7 pages)

Specifications of UC3844BNG

Pwm Type

Current Mode

Number Of Outputs

Frequency - Max

275kHz

Duty Cycle

50%

Voltage - Supply

11.5 V ~ 25 V

Buck

Boost

Yes

Flyback

Yes

Inverting

Yes

Doubler

Divider

Cuk

Isolated

Yes

Operating Temperature

0°C ~ 70°C

Package / Case

8-DIP (0.300", 7.62mm)

Frequency-max

275kHz

Number Of Pwm Outputs

On/off Pin

Adjustable Output

Topology

Boost/Flyback

Switching Freq

500KHz

Operating Supply Voltage (max)

30V

Output Current

1000A

Synchronous Pin

Rise Time

50ns

Fall Time

50ns

Operating Temperature Classification

Commercial

Mounting

Through Hole

Pin Count

Package Type

PDIP

Duty Cycle (max)

48 % (Typ)

Output Voltage

4.9 V to 5.1 V

Mounting Style

Through Hole

Switching Frequency

500 KHz

Operating Supply Voltage

30 V

Maximum Operating Temperature

70 C

Minimum Operating Temperature

0 C

Current, Input Bias

-2 μA

Current, Output

+12 mA (Sink), -1 mA (Source)

Current, Supply

30 mA

Frequency, Oscillator

250 kHz

Power Dissipation

1.25 W

Regulation, Line

2 mV

Regulation, Load

3 mV

Regulator Type

DC-DC

Temperature, Operating, Range

0 to +70 °C

Time, Fall

50 ns

Time, Rise

50 ns

Voltage, Gain

3 V/V

Voltage, Input

-0.3 to +5.5 V

Voltage, Noise

50 μV

Voltage, Output

5 V

Voltage, Output, High

13.5 V

Voltage, Output, Low

1.6 V

Voltage, Supply

36 V

Voltage, Supply, Rejection Ratio

70 dB

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Other names

UC3844BNGOS

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Meier Automation Equipment Co., Limited

Part Number:

UC3844BNG

Manufacturer:

ON/安森美

Quantity:

20 000

Company:

Amily Shenzhen XNWY Technology Co., Ltd

Part Number:

UC3844BNG

Company:

Amily Shenzhen XNWY Technology Co., Ltd

Part Number:

UC3844BNG/UC3844BN

Current page: 1 of 7
Download datasheet (194Kb)

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

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

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

Related parts for UC3844BNG

UC3844BNG Summary of contents

Page 1

UC3844B, UC3845B, UC2844B, UC2845B High Performance Current Mode Controllers The UC3844B, UC3845B series are high performance fixed frequency 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 ...

Page 2

MAXIMUM RATINGS Bias and Driver Voltages (Zero Series Impedance, see also Total Device spec) (Note 1) Total Power Supply and Zener Current Output Current, Source or Sink (Note 2) Output Energy (Capacitive Load per Cycle) Current Sense and Voltage Feedback ...

Page 3

ELECTRICAL CHARACTERISTICS T is the operating ambient temperature range that applies [Note 8], unless otherwise noted.) A Characteristic OSCILLATOR SECTION Discharge Current (V = 2.0 V) OSC T = 25° (UC284XB, UC384XB) A low ...

Page 4

ELECTRICAL CHARACTERISTICS values T is the operating ambient temperature range that applies [Note 12], unless otherwise noted.) A Characteristic PWM SECTION Duty Cycle Maximum (UC284XB, UC384XB) Maximum (UC384XBV) Minimum TOTAL DEVICE Power Supply Current Startup (V = 6.5 V for ...

Page 5

ORDERING INFORMATION Device Operating Temperature Range UC384xBD UC384xBDG UC384xBDR2 UC384xBDR2G UC384xBD1 UC384xBD1G UC384xBD1R2 UC384xBD1R2G UC384xBN UC384xBNG UC284xBD UC284xBDG UC284xBDR2 UC284xBDR2G UC284xBD1 UC284xBD1G UC284xBD1R2 UC284xBD1R2G UC284xBN UC284xBNG UC384xBVD UC384xBVDG UC384xBVDR2 UC384xBVDR2G UC384xBVD1 T UC384xBVD1G UC384xBVD1R2 UC384xBVD1R2G UC384xBVN UC384xBVNG †For information on ...

Page 6

F −A− NOTE 2 C −T− N SEATING PLANE 0.13 (0.005) M PACKAGE DIMENSIONS PDIP−8 N SUFFIX CASE 626−05 ISSUE NOTES: ...

Page 7

... G C SEATING PLANE −Z− 0.25 (0.010 *For additional information on our Pb−Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. PACKAGE DIMENSIONS SOIC−8 NB CASE 751−07 ISSUE 0.10 (0.004 SOLDERING FOOTPRINT* 1 ...

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