KA3882E - Fairchild Semiconductor

www.fairchildsemi.com

Rev. 5.0

Features

• Low Start Current 0.2mA (typ)

• Op erating Range Up To 500KHz

• Cycle by Cycle Current Limiting

• Under Voltage Lock Out With Hysteresis

• Short Sh utdown Dela y Time: typ.100ns

• High Current Totem-pole Output

• Outp ut S wing Limi t ing: 22 V

Description

The KA 3882E/K A 38 83E a re fi x e d P WM co ntroller for Off-

Line and DC to DC converter applications. The internal cir-

cuits include UVLO, low start up current circuit, tempera-

ture compensated reference, high gain error am plifier,

curre nt sensi n g c omp a rat o r, and high cu rr ent tot e m -p ole out -

put for driving a POWER MOSFET. Also KA3882E/

KA3883E provide lo w start up current below 0.3mA and

short shutdown delay time typ. 100ns. The KA3882E has

UVLO thr esh old of 16 V(on) and 10 V(of f) . The KA3883 E is

8.4V(on) and 7.6V(off). The KA3882E and KA3883E can

operate within 100% duty cycle.

8-DIP

8-SOP 1

Internal Block Diagram

SET/

RESET

VREF

Internal

Bias Good LOGIC

OSCILLATOR

UVLO

29V

22V

1/3

Error Amp

1/2VREF

C.S

Comp. PWM

LATCH

VREF

VFB

COMP

C.S

RT/CT

OUTPUT

VCC

GND

PWR

GND

KA3882E/KA3883E

SMPS Controller

KA3882E/KA3883E

Absolute Maximum Ratings

Electrical Characteristics

(VCC = 15V, RT = 10KW, CT = 3.3nF, TA = 0°C to + 70°C ,Unless otherwise specified)

Notes:

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

2. Parame ter me asured at trip point of latch with VFB = 0V.

3. Gain def ine d as:

Parameter Symbol Value Unit

Supply Voltage VCC 30 V

Output Current IO+ 1 A

Analog Inputs (pin 2, 3) VI(ANA) - 0.3 to 6.3 V

Error Amp. Output Sink Current ISINK(EA) 10 mA

Power Dissipation PD1W

Parameter Symbol Conditions Min. Typ. Max. Unit

REFERENCE SECTION

Output Voltage VREF TJ = 25°C, IO = 1mA 4.9 5.0 5.1 V

Line Regulation RLine VCC = 12V to 25V - 6 20 mV

Load Regulation RLOAD IO = 1mA to 20mA - 6 25 mV

Output Short Circuit ISC Ta = 25°C - - 100 - 180 mA

OSILLATOR SECTION

Initial Accuracy FOSC TJ = 25°C475257kHz

Voltage Stability STV VCC = 12V to 25V - 0.2 1 %

Amplitude VOSC VPIN4, Peak to Peak - 1.7 - V

Discharge Current IDISCHG TJ = 25°C 7.8 8.3 8.8 mA

CURRENT SENSE SECTION

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

Maximum Input Signal VI(MAX) VPIN1 = 5V(NOTE 2) 0.9 1.0 1.1 V

PSRR PSRR VCC = 12V to 25V (NOTE 1, 2) - 70 - dB

Input Bias Current IBIAS VSENSE=0V - - 2 -10 uA

Delay to Output TD VPIN3 = 0 V to 2V (NOTE1) - 100 200 ns

GV∆VCOMP

∆VSENSE

------------------------- OV

SENSE 0.8V≤≤;=

KA3882E/KA3883E

Electrical Characteristics (Continued)

(VCC = 15V, RT = 10KW, CT = 3.3nF, TA = 0°C to + 70 °C, Unless otherwise specified)

* Adjust VCC above the start threshold before setting at 15V

Notes :

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

2. Parame ter me asured at trip point of latch with VFB = 0V.

3. Gain def ine d as:

Parameter Symbol Conditions Min. Typ. Max. Unit

ERROR AMPLIFIER SECTION

Input Voltage VI VPIN1 = 2.5V 2.42 2.50 2.58 V

Input Bias Current IBIAS VFB=0V - -0.3 - 2 uA

Open Loop Gain GVO VO = 2V to 4V (NOTE 1) 65 90 - dB

Unity Gain Bandwidth GBW TJ= 25°C (NOTE 1) 0.7 1 - MHz

PSRR PSRR VCC = 12V to 25V (NOTE 1) 60 70 - dB

Output Sink Current ISINK VPIN2 = 2.7V

VPIN1 = 1.1V 26-mA

Output Source Current ISOURCE VPIN2 = 2.3V

VPIN1 = 5.0V -0.5 -0.8 - mA

Output High Voltage VOH VPIN2 = 2.3V

R1 = 15KΩ to GND 56-V

Output Low Voltage VOL VPIN2 = 2.7V

R1 = 15KΩ to Vref -0.71.1V

OUTPUT SECTION

Output Low Level VOL ISINK = 20mA - 0.1 0.4 V

ISINK = 200mA - 1.5 2.2 V

Output High Level VOH ISOURCE = 20mA 13 13.5 - V

ISOURCE = 200mA 12 13.5 - V

Rise Time tR TJ = 25°C, C1 = 1nF (NOTE 1) - 40 100 ns

Fall Time tF TJ = 25°C, C1 = 1nF (NOTE 1) - 40 100 ns

Output Voltage Swing Limit VOLIM VCC = 27V, C1 = 1nF - 22 - V

UNDER VOLTAGE LOCKOUT SECTION

Start Threshold VTH KA3882E 15 16 17 V

KA3883E 7.8 8.4 9.0 V

Min. Operating Voltage

( After turn on ) VTL KA3882E 9 10 11 V

KA3883E 7.0 7.6 8.2 V

PWM SECTION

Maximum Duty Cycle DMAX KA3882E/KA3883E 94 96 100 %

Minimum Duty Cycle DMIN ---0%

TOTAL STANDBY CURRENT

Start-Up Current IST --0.20.4mA

Operating Supply Current ICC VPIN2 = VPIN3 = 0V - 11 17 mA

VCC Zener Voltage VZ ICC = 25mA - 29 - V

GV∆VCOMP

∆VSENSE

------------------------- OV

SENSE 0.8V≤≤;=

KA3882E/KA3883E

Mechanical Dimensions

Package Dimensions in millimeters

6.40

±0.20

3.30

±0.30

0.130

±0.012

3.40

±0.20

0.134

±0.008

#4 #5

0.252

±0.008

9.20

±0.20

0.79

2.54

0.100

0.031

()

0.46

±0.10

0.018

±0.004

0.060

±0.004

1.524

±0.10

0.362

±0.008

9.60

0.378 MAX

5.08

0.200

0.33

0.013

7.62

0~15°

0.300

MAX

MIN

0.25

+0.10

–0.05

0.010

+0.004

–0.002

8-DIP

KA3882E/KA3883E

Mechanical Dimensions (Continued)

Package Dimensions in millimeters

4.92

±0.20

0.194

±0.008

0.41

±0.10

0.016

±0.004

1.27

0.050

5.72

0.225

1.55

±0.20

0.061

±0.008

0.1~0.25

0.004~0.001

6.00

±0.30

0.236

±0.012

3.95

±0.20

0.156

±0.008

0.50

±0.20

0.020

±0.008

5.13

0.202 MAX

#4 #5

0~8°

0.56

0.022

()

1.80

0.071

MAX0.10

MAX0.004

MAX

MIN

+0.10

-0.05

0.15+0.004

-0.002

0.006

8-SOP

KA3882E/KA3883E

Ordering Information

Product Number Package Operating Temperature

KA3882E 8-DIP

0 ~ + 70°C

KA3882ED 8-SOP

KA3883E 8-DIP

KA3883ED 8-SOP

KA3882E/KA3883E

9/25/00 0.0m 001

Stock#DSxxxxxxxx

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INTERNATIONAL. As used herein:

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which, (a) are intended for surgical implant into the body,

or (b) support or sustain life, and (c) whose failure to

perform when properly used in accordance with

instructions for use provided in the labeling, can be

reasonably expected to result in a significant injury of the

user.

2. A critical component in any component of a life support

device or syst em who se failure to perform can be

reasonably expected to cause the failure of the life support

device or system, or to affect its safety or effec tiv ene ss.

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