UC3843ADM Microsemi Analog Mixed Signal Group, UC3843ADM Datasheet - Page 5
UC3843ADM
Manufacturer Part Number
UC3843ADM
Description
IC CTRLR PWM CURRENT MODE 8SOIC
Manufacturer
Microsemi Analog Mixed Signal Group
Datasheet
1.UC3844AM.pdf
(8 pages)
Specifications of UC3843ADM
Pwm Type
Current Mode
Number Of Outputs
1
Frequency - Max
500kHz
Duty Cycle
100%
Voltage - Supply
8.2 V ~ 25 V
Buck
Yes
Boost
Yes
Flyback
Yes
Inverting
No
Doubler
No
Divider
No
Cuk
No
Isolated
Yes
Operating Temperature
0°C ~ 70°C
Package / Case
8-SOIC
Frequency-max
500kHz
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
UC3843ADM
Manufacturer:
MOLEX
Quantity:
10
Part Number:
UC3843ADM
Manufacturer:
MICREL/麦瑞
Quantity:
20 000
Copyright © 1995
Rev. 1.2a 10/25
FIGURE 1. — OSCILLATOR FREQUENCY vs. TIMING
100k
10k
1M
0
RESISTOR
300
1.0k
C
T
R
= 4.7nF
T
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
- (ohms)
3.0k
FIGURE 2. — MAXIMUM DUTY CYCLE vs. TIMING RESISTOR
100.0
C
80.0
60.0
40.0
20.0
U R R E N T
P
0
10.0k
C
R O D U C T I O N
T
C H A R A C T E R I S T I C C U R V E S
= 1nF
C
T
= 2.2nF
30.0k
300
M
O D E
100k
1.0k
R
T
P W M C
- (ohms)
3.0k
D
Note: Output drive frequency is half the oscillator frequency for
A T A
10.0k
O N T R O L L E R
the UCx844A/5A devices.
UC184xA/284xA/384xA
S
30.0k
H E E T
GROUND
For R
100k
R
T
T
V
/C
> 5k, f
REF
T
8
4
5
1.72
R
T
C
T
R
T
C
T
5