UC3844A View Datasheet(PDF) - First Components International
Part Name
Description
Manufacturer
UC3844A Datasheet PDF : 6 Pages
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UC3844A High Performance
Current Mode Controller
ABSOLUTE MAXIMUM RATINGS
Item
Total Power Supply and Zener Current
Output Current, Source or Sink (Note 1)
Output Energy (Capacitive Load per Cycle)
Current Sense and Voltage Feedback Inputs
Error Amp Output Sink Current
Power Dissipation and Thermal Characteristics
CS, D8 Suffix, SOP-14, SOP-8 Package
Maximum Power Dissipation
Thermal Resistance, Junction to Air
CD Suffix, 8-DIP Package
Maximum Power Dissipation
Thermal Resistance, Junction to Air
Operating Ambient Temperature Range
Operating Junction Temperature
Storage Temperature Range
Symbol
(ICC +IZ)
IO
W
Vin
IO
PD
RθJA
PD
RθJA
TA
TJ
TS
Rating
Unit
30
mA
1.0
A
5.0
µJ
-0.3 to +5.5
V
10
mA
862
145
1.25
100
0 to 70
150
-65 to 150
mW
oC/W
W
oC/W
oC
oC
oC
ELECTRICAL CHARACTERISTICS
VCC = 15V (Note 2), RT = 10k, CT = 3.3nF, TA = 0 to 70oC (Note 3) unless otherwise noted.
REFERENCE SECTION
Item
Symbol
Reference Output Voltage (IO = 1.0mA, TJ = 25oC)
Line Regulation (VCC = 12V to 25V)
Load Regulation (IO = 1.0mA to 20mA)
Temperature Stability
Total Output Variation over Line, Load, Temp.
Output Noise Voltage (f = 10Hz to 10kHz, TJ = 25oC)
Long Term Stability (TA = 125oC for 1000 Hours)
Output Short Circuit Current
VREF
Regline
Regload
TS
VREF
Vn
S
ISC
Min Typ
4.9 5.0
--- 2.0
--- 3.0
--- 0.2
4.82 ---
--- 50
--- 5.0
-30 -85
Max Unit
5.1 V
20 mV
25 mV
--- mV/oC
5.18 V
--- µV
--- mV
-180 mA
OSCILLATOR SECTION
Frequency
fOSC
TJ = 25oC
TA = 0 to 70oC
Frequency Change with Voltage (VCC = 12V to 25V) ∆fOSC/∆V
Frequency Change with Temperature
∆fOSC/∆T
Oscillator Voltage Swing (Peak-to-Peak)
VOSC
Discharge Current (VOSC = 2.0V)
TJ = 25oC
Idischg
V
47 52 57
46 --- 60
--- 0.2 1.0 %
--- 5.0 --- %
--- 1.6 --- V
mA
--- 10.8 ---
4-25
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