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KA3882C/KA3883C
SMPS Controller
Features
•
•
•
•
•
•
•
Low Start Current 0.2mA (Typ)
Operating Range Up To 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 KA3882C/KA3883C is a fixed PWM controller for Off
Line and DC to DC converter applications. The internal
circuits include an 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
KA3882C/KA3883C provides low start-up current below
0.3mA and short shutdown delay time typ. 100ns. The
KA3882C has the UVLO threshold of 16V (on) and
10V(off). The KA3883C is 8.4V(on) and 7.6V(off). The
KA3882C and KA3883C can operate within 100% duty
cycle.
8-DIP
1
8-SOP
1
Internal Block Diagram
7
V
CC
29V
V
REF
8
Internal
Bias
1/2V
REF
5V
V
REF
SET/
RESET
UVLO
5
GND
Good LOGIC
7
PWR
V
C
V
FB
2
Error Amp
+
-
C.S
PWM
Comp. LATCH
1/3
1V
S
R
22V
6
OUTPUT
COMP
1
5
PWR
C.S
3
R
T
/C
T
4
T
GND
OSCILLATOR
Rev. 1.0.1
©2002 Fairchild Semiconductor Corporation
KA3882C/KA3883C
Electrical Characteristics
(Continued)
(V
CC
= 15V, R
T
= 10kΩ, C
T
= 3.3nF, T
A
= 0°C to +70°C, Unless otherwise specified)
Parameter
ERROR AMPLIFIER SECTION
Input Voltage
Input Bias Current
Open Loop Gain
Unity Gain Bandwidth
PSRR
Output Sink Current
Output Source Current
Output High Voltage
Output Low Voltage
OUTPUT SECTION
Output Low Level
Output High Level
Rise Time
Fall Time
Output Voltage Swing Limit
V
OL
V
OH
t
R
t
F
V
OLIM
I
SINK
= 20mA
I
SINK
= 200mA
I
SOURCE
= 20mA
I
SOURCE
= 200mA
T
J
= 25°C, C1 = 1nF (Note1)
T
J
= 25°C, C1 = 1nF (Note1)
V
CC
= 27V, C1 = 1nF
KA3882C
KA3883C
KA3882C
KA3883C
KA3882C/KA3883C
-
-
V
PIN2
= V
PIN3
= 0V
I
CC
= 25mA
-
-
13
12
-
-
-
15
7.8
9
7.0
94
-
-
-
-
0.1
1.5
13.5
13.5
40
40
22
16
8.4
10
7.6
96
-
0.2
11
29
0.4
2.2
-
-
100
100
-
17
9.0
11
8.2
100
0
0.4
17
-
V
V
V
V
ns
ns
V
V
V
V
V
%
%
mA
mA
V
V
I
I
BIAS
G
VO
GBW
PSRR
I
SINK
I
SOURCE
V
OH
V
OL
T
J
= 25°C (Note1)
V
CC
= 12V to 25V (Note1)
V
PIN2
= 2.7V, V
PIN1
= 1.1V
V
PIN2
= 2.3V, V
PIN1
= 5.0V
V
PIN2
= 2.3V, R1 = 15kΩ to GND
V
PIN2
= 2.7V, R1 = 15kΩ to Pin8
T
PIN1
= 2.5V
-
V
O
= 2V to 4V (Note1)
2.42
-
65
0.7
60
2
-0.5
5
-
2.50
-0.3
90
1
70
6
-0.8
6
0.8
2.58
-2
-
-
-
-
-
-
1.1
V
uA
dB
MHz
dB
mA
mA
V
V
Symbol
Conditions
Min.
Typ.
Max.
Unit
UNDER VOLTAGE LOCKOUT SECTION
Start Threshold
Min. Operating Voltage
( After turn on )
PWM SECTION
Maximum Duty Cycle
Minimum Duty Cycle
TOTAL STANDBY CURRENT
Start-Up Current
Operating Supply Current
V
CC
Zener Voltage
I
ST
I
CC
V
Z
D
MAX
D
MIN
V
TH
V
TL
* Adjust V
CC
above the start threshold before setting at 15V
Notes :
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
=
∆V
PIN1
∆V
PIN3
(V
PIN3
= 0 to 0.8V)
4. Junction-to-air thermal resistance test enviroments.
-. PCB information ;
Board thickness : 1.6mm , Board dimension : 76.2 X 114.3mm
2
, Ref. : EIA / JSED51-3 and EIA / JSED51-7
-. Board structure; Using the single layer PCB.
3
Analog electronics
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