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KA3843AC Datasheet(PDF) 3 Page - Fairchild Semiconductor

Part # KA3843AC
Description  SMPS Controller
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Manufacturer  FAIRCHILD [Fairchild Semiconductor]
Direct Link  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

KA3843AC Datasheet(HTML) 3 Page - Fairchild Semiconductor

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KA3843AC
3
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. Parameter measured at trip point of latch with VFB = 0V.
3. Gain defined 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 (Note1)
65
90
-
dB
Unity gain bandwidth
GBW
TJ= 25
°C (Note1)
0.7
1
-
MHz
PSRR
PSRR
VCC = 12V to 25V (Note1)
60
70
-
dB
Output sink current
ISINK
VPIN2 = 2.7V, VPIN1 = 1.1V
2
6
-
mA
Output source current
ISOURCE
VPIN2 = 2.3V, VPIN1 = 5.0V
-0.5
-0.8
-
mA
Output high voltage
VOH
VPIN2 = 2.3V
R1 = 15K
Ω to GND
56
-
V
Output low voltage
VOL
VPIN2 = 2.7V
R1 = 15k
Ω to Vref
-0.7
1.1
V
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 (Note1)
-
40
100
ns
Fall time
tF
TJ = 25
°C, C1 = 1nF (Note1)
-
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
--
0.2
0.4
mA
Operating supply current
ICC
VPIN2 = VPIN3 = 0V
-
11
17
mA
VCC zener voltage
VZ
ICC = 25mA
-
29
-
V
G
V
∆V
CO MP
∆V
SE NSE
------------------------- OV
SENSE
0.8V
≤≤
;
=


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