Datasheet KA3883D, KA3883, KA3882D, KA3885D, KA3885 Datasheet (Fairchild Semiconductor)

KA3882/3/4/5 SMPS CONTROLLER

CURRENT MODE PWM CONTROLLER

The KA3882/3/4/5 are fixed PWM controller for Off-Line and DC
to DC converter applications. The internal circuits include

UVLO,

low start up current circuit, temperature compensated

reference,

high

gain error amplifier, current sensing comparator, and high
current totempole output for driving a POWER MOSFET. Also KA
3882/3/4/5 provide low start up

current below 0.3mA and short
shutdown delay time typ. 100ns.
The

KA3882 and KA3884 have UVLO threshold of 1 6V(on) and 8 SOP
10V(off).
The KA3883 and KA3885 are 8.4V(on) and 7.6V(off).
The KA3882 and KA3883 can operate within 100% duty cycle.
The KA3884 and KA3885 within 50% by using T Flip-Flop.

FEATURES

• Low Start Current 0.2mA (typ)

• Operating Range Up To 500KHz

• Cycle by Cycle Current Limiting

ORDERING INFORMATI ON

• Under Voltage Lock Out With Hysteresis

• Short Shutdown Delay Time: typ.100ns

• High Current Totempole Output

• Output Swing Limiting: 22V

BLOCK DIAGRAM

Device Package Operating Temperature

KA388X 8 DIP

0 ~ + 85

Î

KA388XD 8 SOP

0 ~ + 85

Î

8 DIP

©1999 Fairchild Semiconductor Co rporation

Rev. B

KA3882/3/4/5 SMPS CONTROLLER

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VCC = 15V, RT = 10K`, CT = 3.3nF, TA = 0Îto + 85Î, Unless otherwise specified)

Characteristic Symbol Value Unit

Supply Voltage V

CC

30 V

Output Current I

O

+ 1 A

Analog Inputs (pin 2, 3) V

I(ANA)

- 0.3 to 6.3 V

Error Amp. Output Sink Current I

SINK(EA)

10 mA

Power Dissipation P

D

1W

Characteristic Symbol Test Conditions Min Typ Max Unit

REFERENCE SECTION

Output Voltage V

REF

TJ = 25Î, IO = 1mA

4.9 5.0 5.1 V

Line Regulation

L

V

REF

VCC = 12V to 25V

ï

620mV

Load Regulation

L

V

REF

IO = 1mA to 20mA

ï

625mV

Output Short Circuit I

SC

Ta = 25

Î

ï

- 100 - 180 mA

OSILLATOR SECTION

Initial Accuracy F

OSC

TJ = 25

Î

47 52 57 KHz

Voltage Stability ST

V

V

CC

= 12V to 25V

ï

0.2 1 %

Amplitude V

OSC

V

PIN4

, Peak to Peak

ï

1.7

ï

V

Discharge Current I

DISCHG

TJ = 25Î, Pin4 = 2V

7.8 8.3 8.8 mA

CURRENT SENSE SECTION

Gain G

V

(NOTE 2, 3) 2.85 3 3.15 V/V

Maximum Input Signal V

I(MAX)

V

PIN1

= 5V(NOTE 2) 0.9 1.0 1.1 V

PSRR PSRR

V

CC

= 12V to 25V

(NOTE 1, 2)

ï

70

ï

dB

Input Bias Current I

BIAS

ïï

- 2 -10 uA

Delay to Output T

D

V

PIN3

= 0V to 2V (NOTE1)

ï

100 200 ns

KA3882/3/4/5 SMPS CONTROLLER

ELECTRICAL CHARACTERISTICS(Continued)

(VCC = 15V, RT = 10K`, CT = 3.3nF, TA = 0Îto + 85Î, Unless otherwise specified)

Characteristic Symbol Test Conditions Min Typ Max Unit

ERROR AMPLIFIER SECTION

Input Voltage V

I

T

PIN1

= 2.5V 2.42 2.50 2.58 V

Input Bias Current I

BIAS

ïï

-0.3 - 2 uA

Open Loop Gain G

VO

VO = 2V to 4V
(NOTE 1)

65 90

ï

dB

Unity Gain Bandwidth GBW

T

J

= 25

Î

(NOTE 1)

0.7 1

ï

MHz

PSRR PSRR

V

CC

= 12V to 25V

(NOTE 1)

60 70

ï

dB

Output Sink Current I

SINK

V

PIN2

= 2.7V

V

PIN1

= 1.1V

26

ï

mA

Output Source Current I

SOURCE

V

PIN2

= 2.3V

V

PIN1

= 5.0V

-0.5 -0.8

ï

mA

Output High Voltage V

OH

V

PIN2

= 2.3V

R1 = 15K` to GND

56

ï

V

Output Low Voltage V

OL

V

PIN2

= 2.7V

R1 = 15K` to Pin8

ï

0.8 1.1 V

OUTPUT SECTION

I

SINK

= 20mA

ï

0.1 0.4 V

I

SINK

= 200mA

ï

1.5 2.2 V

I

SOURCE

= 20mA 13 13.5

ï

V

I

SOURCE

= 200mA 12 13.5

ï

V

Rise Time t

R

TJ = 25Î, C1 = 1nF
(NOTE 1)

ï

40 100 ns

Fall Time t

F

TJ = 25Î, C1 = 1nF
(NOTE 1)

ï

40 100 ns

Output Voltage Swing Limit V

OLIM

VCC = 27V, C1 = 1nF

ï

22

ï

V

UNDER VOLTA GE LOCKOUT SECTION

KA3882/4 15 16 17 V

KA3883/5 7.8 8.4 9.0 V
Min.Operating Voltage KA3882/4 9 10 11 V
( After turn on ) KA3883/5 7.0 7.6 8.2 V

Output Low Level V

OL

Output High Level

V

OH

Start Threshold

V

TH

V

TL

KA3882/3/4/5 SMPS CONTROLLER

ELECTRICAL CHARACTERISTICS(Continued)

(V

CC

= 15V, RT = 10K`, CT = 3.3nF, TA = 0Îto +85Î, unless otherwise specified)



Adjust V

CC

above the start threshold bifore setting at 15V

NOTE 1. These parameters, although guaranteed, are not 100% tested in production.

2. Parameter measured at trip point of latch with V2 = 0V.

3. Gain defined as: G

V

= LV

PIN1

L

V

PIN3(VPIN3

= 0 to 0.8V)

Characteristic Symbol Test Conditions Min Typ Max Unit

PWM SECTION

KA3882/3 94 96 100 %

KA3884/5 47 48 50 %

Minimum Duty Cycle D

MIN

ïïï

0%

TOTAL STANDBY CURRENT

Start-Up Current I

ST

ïï

0.2 0.4 mA

Operating Supply Current I

CC

V

PIN2

= V

PIN3

= 0V

ï

11 17 mA

VCC Zener Voltage V

Z

ICC = 25mA

ï

29

ï

V

Maximum Duty Cycle

D

MAX

TRADEMARKS

ACEx™
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TM

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®

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PRODUCT STA TUS DEFINITIONS
Definition of Terms

Datasheet Identification Product Status Definition

Advance Information

Preliminary

No Identification Needed

Obsolete

This datasheet contains the design specifications for
product development. Specifications may change in
any manner without notice.

This datasheet contains preliminary data, and
supplementary data will be published at a later date.
Fairchild Semiconductor reserves the right to make
changes at any time without notice in order to improve
design.

This datasheet contains final specifications. Fairchild
Semiconductor reserves the right to make changes at
any time without notice in order to improve design.

This datasheet contains specifications on a product
that has been discontinued by Fairchild semiconductor.
The datasheet is printed for reference information only.

Formative or
In Design

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Full Production

Not In Production

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