UC3842N Fairchild Semiconductor, UC3842N Datasheet - Page 4
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UC3842N
Manufacturer Part Number
UC3842N
Description
IC CTLR PWM CURR MODE 8-DIP
Manufacturer
Fairchild Semiconductor
Datasheet
1.UC3842D.pdf
(12 pages)
Specifications of UC3842N
Pwm Type
Current Mode
Number Of Outputs
1
Frequency - Max
500kHz
Duty Cycle
100%
Voltage - Supply
11.5 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
35 ns
Minimum Operating Temperature
0 C
Rise Time
45 ns
Synchronous Pin
No
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
UC3842NFS
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
UC3842N
Manufacturer:
ST
Quantity:
20 000
Part Number:
UC3842NG4
Manufacturer:
TI/德州仪器
Quantity:
20 000
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