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UC3844 Datasheet(PDF) 2 Page - ON Semiconductor

Part No. UC3844
Description  HIGH PERFORMANCE CURRENT MODE CONTROLLERS
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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UC3844 Datasheet(HTML) 2 Page - ON Semiconductor

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UC3844, 45 UC2844, 45
2
MOTOROLA ANALOG IC DEVICE DATA
MAXIMUM RATINGS
Rating
Symbol
Value
Unit
Total Power Supply and Zener Current
(ICC + IZ)
30
mA
Output Current, Source or Sink (Note 1)
IO
1.0
A
Output Energy (Capacitive Load per Cycle)
W
5.0
µJ
Current Sense and Voltage Feedback Inputs
Vin
– 0.3 to + 5.5
V
Error Amp Output Sink Current
IO
10
mA
Power Dissipation and Thermal Characteristics
D Suffix, Plastic Package, Case 751A
Maximum Power Dissipation @ TA = 25°C
Thermal Resistance Junction–to–Air
N Suffix, Plastic Package, Case 626
Maximum Power Dissipation @ TA = 25°C
Thermal Resistance Junction–to–Air
PD
R
θJA
PD
R
θJA
862
145
1.25
100
mW
°C/W
W
°C/W
Operating Junction Temperature
TJ
+ 150
°C
Operating Ambient Temperature
UC3844, UC3845
UC2844, UC2845
TA
0 to + 70
– 25 to + 85
°C
Storage Temperature Range
Tstg
– 65 to + 150
°C
ELECTRICAL CHARACTERISTICS (VCC = 15 V, [Note 2], RT = 10 k, CT = 3.3 nF, TA = Tlow to Thigh [Note 3],
unless otherwise noted.)
UC284X
UC384X
Characteristics
Symbol
Min
Typ
Max
Min
Typ
Max
Unit
REFERENCE SECTION
Reference Output Voltage (IO = 1.0 mA, TJ = 25°C)
Vref
4.95
5.0
5.05
4.9
5.0
5.1
V
Line Regulation (VCC = 12 V to 25 V)
Regline
2.0
20
2.0
20
mV
Load Regulation (IO = 1.0 mA to 20 mA)
Regload
3.0
25
3.0
25
mV
Temperature Stability
TS
0.2
0.2
mV/
°C
Total Output Variation over Line, Load, Temperature
Vref
4.9
5.1
4.82
5.18
V
Output Noise Voltage (f = 10 Hz to kHz, TJ = 25°C)
Vn
50
50
µV
Long Term Stability (TA = 125°C for 1000 Hours)
S
5.0
5.0
mV
Output Short Circuit Current
ISC
– 30
– 85
– 180
– 30
– 85
– 180
mA
OSCILLATOR SECTION
Frequency
TJ = 25°C
TA = Tlow to Thigh
fosc
47
46
52
57
60
47
46
52
57
60
kHz
Frequency Change with Voltage (VCC = 12 V to 25 V)
∆fosc/∆V
0.2
1.0
0.2
1.0
%
Frequency Change with Temperature
TA = Tlow to Thigh
∆fosc/∆T
5.0
5.0
%
Oscillator Voltage Swing (Peak–to–Peak)
Vosc
1.6
1.6
V
Discharge Current (Vosc = 2.0 V, TJ = 25°C)
Idischg
10.8
10.8
mA
NOTES: 1. Maximum Package power dissipation limits must be observed.
2. Adjust VCC above the Startup threshold before setting to 15 V.
3. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible
Tlow = –20°C for UC3844, UC3845
Thigh = +70°C for UC3844, UC3845
Tlow = –25°C for UC2844, UC2845
Thigh = +85°C for UC2844, UC2845


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