UC3843D1 Fairchild Semiconductor, UC3843D1 Datasheet - Page 4
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UC3843D1
Manufacturer Part Number
UC3843D1
Description
Current Mode PWM Controllers Current Mode PWM Control IC
Manufacturer
Fairchild Semiconductor
Datasheet
1.UC3843D1.pdf
(12 pages)
Specifications of UC3843D1
Number Of Outputs
1
Duty Cycle (max)
100 %
Output Current
1000 mA
Mounting Style
SMD/SMT
Package / Case
SOP-8
Switching Frequency
500 KHz
Maximum Operating Temperature
+ 70 C
Fall Time
35 ns
Minimum Operating Temperature
0 C
Rise Time
45 ns
Synchronous Pin
No
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
UC3842/UC3843/UC3844/UC3845
Electrical Characteristics
(V
Adjust V
Note:
1. Parameter measured at trip point of latch
2. Gain defined as:
3. These parameters, although guaranteed, are not 100 tested in production.
High peak currents associated with capacitive loads necessitate careful grounding techniques Timing and bypass capacitors
should be connected close to pin 5 in a single point ground. The transistor and 5k potentiometer are used to sample the
oscillator waveform and apply an adjustable ramp to pin 3.
4
A
Parameter
PWM SECTION
Max. Duty Cycle
Min. Duty Cycle
TOTAL STANDBY CURRENT
Start-Up Current
Operating Supply Current
Zener Voltage
CC
=
=15V, R
----------------- -
V
V
CC
pin1
pin3
above the start threshould before setting at 15V
T
,0
=10k , C
V
pin3
T
=3.3nF, T
0.8V
A
= 0 C to +70 C, unless otherwise specified)
I
Symbol
CC(OPR)
D
D
D
(Continued)
(Max)
(Max)
(MIN)
I
V
ST
Figure 1. Open Loop Test Circuit
Z
UC3842/UC3843
UC3844/UC3845
V
I
CC
pin3
= 25mA
=V
UC3842
pin2
Conditions
=ON
-
-
Min.
95
47
30
-
-
-
Typ.
0.45
97
48
14
38
-
Max.
100
50
17
0
1
-
Unit
mA
mA
%
%
%
V