uc2842ay Microsemi Corporation, uc2842ay Datasheet

uc2842ay

Manufacturer Part Number

uc2842ay

Description

Current Mode Pwms

Manufacturer

Microsemi Corporation

Datasheet

1.UC2842AY.pdf (8 pages)

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Rev. 1.2a,2005-03-09

H E

all the necessary features to implement off-line

fixed-frequency, current-mode switching power

supplies

components. The current mode architecture

demonstrates improved load regulation, pulse-

by-pulse current limiting and inherent protection

of the power supply output switch. The IC

includes: A bandgap reference trimmed to ±1%

accuracy, an error amplifier, a current sense

comparator with internal clamp to 1V, a high

current totem pole output stage for fast

switching

IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com

The UC184xA family of control ICs provides

N F I N I T E

OMPARISON OF

with

-40 to +85

-55 to 125

Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. UC3842ADM-TR)

0 to 70

power

SG384x

Min. Li m it

(°C)

minimum

O W E R

MOSFET's,

Discharge Cu rrent Dist ribution - mA

7.5

RoHS Compliant / Pb-free

11861 W

UC384

Transition DC: 0503

P R O D U C T H I G H L I G H T

UC384xAM

UC284xAM

-3 s

=25 C

O F

7.8

Plastic DIP

8-Pin

ESTERN

D E S C R I P T I O N

UC384xA

and

I N

external

N N O V A T I O N

Mean

8.3

VENUE

I N I T Y

. SG384

, G

externally programmable oscillator to set

frequency and maximum duty cycle. The

undervoltage lock-out is designed to operate with

250µA typ. start-up current, allowing an efficient

bootstrap supply voltage design. Available

options for this family of products, such as start-

up voltage hysteresis and duty cycle, are

summarized below in the Available Options

section. The UC184xA family of control ICs is

also available in 14-pin SOIC package which

makes the Power Output Stage Collector and

Ground pins available.

ARDEN

+3s

8.8

PACKAGE ORDER INFO

RoHS Compliant / Pb-free Transition DC: 0440

UC384xADM

UC284xADm

I C R O E L E C T R O N I C S

ROVE

9.3

ISCHARGE

Plastic SOIC

8-Pin

, CA. 92841, 714-898-8121, F

SG384x

Max. Limit

URRENT

U R R E N T

R O D U C T I O N

UC184xA / 284xA / 384xA

UC384xAD

UC284xAD

Plastic SOIC

14-Pin

N C

O D E

: 714-893-2570

P W M C

Available Options

UCx842A

UCx843A

UCx844A

UCx845A

Part#

A T A

LOW START-UP CURRENT.

(0.5mA max.)

DISCHARGE CURRENT. (See

Product Highlight)

OPTIMIZED FOR OFF-LINE

AND DC-TO-DC

CONVERTERS.

AUTOMATIC FEED FORWARD

COMPENSATION.

PULSE-BY-PULSE CURRENT

LIMITING.

ENHANCED LOAD RESPONSE

CHARACTERISTICS.

UNDER-VOLTAGE LOCKOUT

WITH HYSTERESIS.

DOUBLE PULSE

SUPPRESSION.

HIGH-CURRENT TOTEM POLE

OUTPUT.

INTERNALLY TRIMMED

BANDGAP REFERENCE.

500KHz OPERATION.

LOW RO ERROR AMPLIFIER.

ECONOMICAL OFF-LINE

FLYBACK OR FORWARD

CONVERTERS.

DC-DC BUCK OR BOOST

CONVERTERS.

LOW COST DC MOTOR

CONTROL.

TRIMMED OSCILLATOR

UC284xAY

UC184xAY

K E Y F E A T U R E S

Start-Up

Ceramic DIP

8-Pin

Voltage

O N T R O L L E R

8.4V

8.4A

16V

H E E T

Hysteresis

0.8V

Max. Duty

<100%

Cycle

<50%

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uc2842ay Summary of contents

Page 1

The UC184xA family of control ICs provides all the necessary features ...

Page 2

UC184xA/284xA/384xA ...

Page 3

(Unless otherwise specified, these specifications apply over the operating ambient temperatures for UC384xA with 0°C T ...

Page 4

UC184xA/284xA/384xA Parameter Under-Voltage Lockout Section Start Threshold Min. Operation Voltage After Turn-On PWM Section Maximum Duty ...

Page 5

FIGURE 1. — OSCILLATOR FREQUENCY vs. TIMING RESISTOR 1M 100k C = 4.7nF T 10k 0 ...

Page 6

UC184xA/284xA/384xA FIGURE 3. — CURRENT SENSE SPIKE SUPPRESSION V DC BUS CC 7 UCx84xA 6 5 ...

Page 7

...

Page 8

UC184xA/284xA/384xA ...

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