©2003 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev. 1.0.1
Features
• Low start current 0.2mA (typ)
• Op erating range up t o 500kHz
• Cycle by cycle current limiting
• Under voltage lock out with hysteresis
• Short shutdown delay time: typ.100ns
• High current totem-pole output
• Output swing limiting: 22V
Description
The KA3882E/KA38 83E is a fixed PWM cont roller for
Off-Line and DC to DC converter applications. The internal
circuits include a UVLO, a low start-up current circuit, a
temperature compensated reference, a high gain error
amplifier, a current sensing comparator , and the high current
totem-pole output for driving a POWER MOSFET. Also the
KA3882E /KA3 883E pr ovides low sta rt-up current below
0.3mA and short shutdown delay time typ. 100ns. The
KA3882E ha s UVLO threshold of 16V(on) a nd 10V(off).
The KA3883E is 8.4V(on) and 7.6V(off). The KA3882E and
KA3883E can operate within 100% duty cycle.
8-DIP
8-SOP
1
1
Internal Block Diagram
8
+
-
7
5
SET/
RESET
5V
V
REF
Internal
Bias Good LOGIC
2R
S
OSCILLATOR
1
3
4
T
7
6
5
UVLO
29V
22V
1/3
Error Amp
1/2V
REF
1V
C.S
Comp. PWM
LATCH
V
REF
V
FB
COMP
C.S
R
T
/C
T
OUTPUT
V
CC
GND
PWR
V
C
PWR
GND
KA3882E/KA3883E
SMPS Controller
KA3882E/KA3883E
2
Absolute Maximum Ratings
Electrical Characteristics
(V
CC
= 15V, R
T
= 10kΩ, C
T
= 3.3nF, T
A
= 0°C to +70°C, Unless otherwise specified)
Parameter Symbol Value Unit
Supply voltage V
CC
30 V
Output current I
O
+1 A
Analog inputs (pin2, 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
Thermal resistance, junction-to-air
(Note4)
8-SOP
8-DIP
Rθja 280
95 °C/W
Storage temperature T
stg
-65 ~ 150 °C
Parameter Symbol Conditions Min. Typ. Max. Unit
REFERENCE SECTION
Output voltage V
REF
T
J
= 25°C, I
O
= 1mA 4.9 5.0 5.1 V
Line regulation R
Line
V
CC
= 12V to 25V - 6 20 mV
Load regulation R
LOAD
I
O
= 1mA to 20mA - 6 25 mV
Output short circuit I
SC
T
a
= 25°C - -100 -180 mA
OSILLATOR SECTION
Initial accuracy F
OSC
T
J
= 25°C475257kHz
Voltage stability ST
V
V
CC
= 12V to 25V - 0.2 1 %
Amplitude V
OSC
V
PIN4
, peak to peak - 1.7 - V
Discharge current I
DISCHG
T
J
= 25°C 7.8 8.3 8.8 mA
CURRENT SENSE SECTION
Gain G
V
(Note2, 3) 2.85 3 3.15 V/V
Maximum input signal V
I(MAX)
V
PIN1
= 5V(Note2) 0.9 1.0 1.1 V
PSRR PSRR V
CC
= 12V to 25V (Note1, 2) - 70 - dB
Input bias current I
BIAS
V
SENSE
= 0V - -2 -10 uA
Delay to output T
D
V
PIN3
= 0 V to 2V (Note1) - 100 200 ns
KA3882E/KA3883E
3
Electrical Characteristics
(Continued)
(V
CC
= 15V, R
T
= 10kΩ, C
T
= 3.3nF, T
A
= 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 as ured at trip point of latch with VFB = 0V.
3. Gain def ine d as:
4. Junction-to-air thermal resistance test enviroments.
-. PCB info rm at i on ;
Board thicknes s : 1.6mm , Board dime nsion : 76.2 X 114.3 mm2 , Ref. : EIA / JSED51-3 and EIA / JSED51-7
-. Board structure; Using the single layer PCB.
Parameter Symbol Conditions Min. Typ. Max. Unit
ERROR AMPLIFIER SECTION
Input voltage V
I
V
PIN1
= 2.5V 2.42 2.50 2.58 V
Input bias current I
BIAS
V
FB
=0V - -0.3 - 2 uA
Open loop gain G
VO
V
O
= 2V to 4V (Note1) 65 90 - dB
Unity gain bandwidth GBW T
J
= 25°C (Note1) 0.7 1 - MHz
PSRR PSRR V
CC
= 12V to 25V (Note1) 60 70 - dB
Output sink current I
SINK
V
PIN2
= 2.7V, V
PIN1
= 1.1V 2 6 - mA
Output source current I
SOURCE
V
PIN2
= 2.3V, V
PIN1
= 5.0V -0.5 -0.8 - mA
Output high voltage V
OH
V
PIN2
= 2.3V, R1 = 15kΩ to GND 5 6 - V
Output low voltage V
OL
V
PIN2
= 2.7V, R1 = 15kΩ to Vref - 0.8 1.1 V
OUTPUT SECTION
Output low level V
OL
I
SINK
= 20mA - 0.1 0.4 V
I
SINK
= 200mA - 1.5 2.2 V
Output high level V
OH
I
SOURCE
= 20mA 13 13.5 - V
I
SOURCE
= 200mA 12 13.5 - V
Rise time t
R
T
J
= 25°C, C1 = 1nF (Note1) - 40 100 ns
Fall time t
F
T
J
= 25°C, C1 = 1nF (Note1) - 40 100 ns
Output voltage swing limit V
OLIM
V
CC
= 27V, C1 = 1nF - 22 - V
UNDER VOLTAGE LOCKOUT SECTION
Start threshold V
TH
KA3882E 15 16 17 V
KA3883E 7.8 8.4 9.0 V
Min. operating voltage
( after turn on ) V
TL
KA3882E 9 10 11 V
KA3883E 7.0 7.6 8.2 V
PWM SECTION
Maximum duty cycle D
MAX
KA3882E/KA3883E 94 96 100 %
Minimum duty cycle D
MIN
---0%
TOTAL STANDBY CURRENT
Start-up current I
ST
--0.20.4mA
Operating supply current I
CC
V
PIN2
= V
PIN3
= 0V - 11 17 mA
V
CC
zener voltage V
Z
I
CC
= 25mA - 29 - V
G
V
∆V
COMP
∆V
SENSE
------------------------- 0V
SENSE
0.8V≤≤;=
KA3882E/KA3883E
4
Mechanic al Dime nsions
Package Dimensions in millimeters
6.40
±0.20
3.30
±0.30
0.130
±0.012
3.40
±0.20
0.134
±0.008
#1
#4 #5
#8
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
5
Mechanic al Dime nsions
(Continued)
Package Dimensions in millimeters
8-SOP
KA3882E/KA3883E
11/3/03 0.0m 001
Stock#DSxxxxxxxx
” 2003 Fairchild Semiconductor Corporation
LIFE SU PP ORT POL ICY
FAIRCHILD’ S PRODUCTS ARE NOT AUTHORIZ ED FOR USE AS CRI TICAL C OMPONENTS IN LIFE SUPP ORT DEVI CES
OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR
CORPORA TION. As used he rein :
1. Life support devices or systems are devices or systems
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 fai lure to pe rform 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.
www.fairchildsemi.com
DISCLAIMER
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MA KE CHANGES WITHOUT FURTHER NOTICE TO ANY
PRO DUCTS HEREIN TO IMPROVE RELIABILITY, FUN CTION OR DESIG N. FAIRCHILD DO ES NOT ASSUME ANY
LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER
DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIG HTS, NOR THE RIGHTS OF OT HERS.
Ordering Information
Product Number Package Operating Temperature
KA3882E 8-DIP
0 ~ +70°C
KA3882ED 8-SOP
KA3883E 8-DIP
KA3883ED 8-SOP
