UC3843AN Fairchild Semiconductor, UC3843AN Datasheet - Page 3

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UC3843AN

Manufacturer Part Number
UC3843AN
Description
IC PWM CNTLLR 8DIP
Manufacturer
Fairchild Semiconductor
Datasheet

Specifications of UC3843AN

Pwm Type
Controller
Number Of Outputs
1
Frequency - Max
500kHz
Duty Cycle
100%
Voltage - Supply
8.2 V ~ 30 V
Buck
No
Boost
No
Flyback
No
Inverting
No
Doubler
No
Divider
No
Cuk
No
Isolated
No
Operating Temperature
0°C ~ 70°C
Package / Case
8-DIP (0.300", 7.62mm)
Frequency-max
500kHz
Duty Cycle (max)
100 %
Output Current
1000 mA
Mounting Style
Through Hole
Switching Frequency
500 KHz
Operating Supply Voltage
30 V
Supply Current
17 mA
Maximum Operating Temperature
+ 70 C
Fall Time
40 ns
Minimum Operating Temperature
0 C
Rise Time
40 ns
Synchronous Pin
No
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

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Electrical Characteristics (Continued)
(V
* Adjust V
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
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
UNDER VOLTAGE LOCKOUT SECTION
Start Threshold
PWM SECTION
Maximum Duty Cycle
Minimum Duty Cycle
TOTAL STANDBY CURRENT
Start-Up Current
Operating Supply Current
V
Min. Operating Voltage
( After turn on )
CC
CC
= 15V, R
Zener Voltage
CC
Parameter
above the start threshold before setting at 15V
T
= 10K , C
V
= V
T
PIN1
= 3.3nF, T
V
I
PIN3
Symbol
SOURCE
V
PSRR
D
GBW
I
D
I
G
V
V
SINK
V
V
V
BIAS
V
I
OLIM
I
MAX
V
A
CC
V
t
MIN
t
ST
OH
OH
VO
OL
OL
TH
R
TL
(V
F
Z
I
= 0 C to + 70 C, Unless otherwise specified)
PIN3
= 0 to 0.8V)
UC3842A
UC3842A
T
V
T
V
V
V
V
V
V
R1 = 15K
V
R1 = 15K
I
I
I
I
T
T
V
UC3843A
UC3843A
UC3842A/UC3843A
V
I
SINK
SINK
SOURCE
SOURCE
CC
PIN1
J
J
J
O
CC
PIN2
PIN1
PIN2
PIN1
PIN2
PIN2
CC
PIN2
= 25 C (NOTE 1)
= 25 C, C1 = 1nF (NOTE 1)
= 25 C, C1 = 1nF (NOTE 1)
= 2V to 4V (NOTE 1)
= 25mA
= 12V to 25V (NOTE 1)
= 27V, C1 = 1nF
= 20mA
= 200mA
= 2.5V
= 2.7V
= 1.1V
= 2.3V
= 5.0V
= 2.3V
= 2.7V
= V
= 20mA
= 200mA
PIN3
to GND
to Pin8
Conditions
= 0V
-
-
-
Min.
2.42
-0.5
0.7
7.8
7.0
65
60
13
12
15
94
2
5
9
-
-
-
-
-
-
-
-
-
-
-
Typ.
2.50
13.5
13.5
-0.3
-0.8
0.8
0.1
1.5
8.4
7.6
0.2
90
70
40
40
22
16
10
96
29
11
1
6
6
-
UC3842A/UC3843A
Max.
2.58
100
100
100
1.1
0.4
2.2
9.0
8.2
0.4
- 2
17
17
11
0
-
-
-
-
-
-
-
-
-
-
MHz
Unit
mA
mA
mA
mA
uA
dB
dB
ns
ns
%
%
V
V
V
V
V
V
V
V
V
V
V
V
V
3

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