UC2845DR2G View Datasheet(PDF) - ON Semiconductor
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UC2845DR2G Datasheet PDF : 16 Pages
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UC3844, UC3845, UC2844, UC2845
MAXIMUM RATINGS
Rating
Symbol
Value
Unit
Total Power Supply and Zener Current
Output Current, Source or Sink (Note 1)
Output Energy (Capacitive Load per Cycle)
(ICC + IZ)
30
mA
IO
1.0
A
W
5.0
mJ
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
Operating Junction Temperature
PD
RqJA
PD
RqJA
TJ
862
145
1.25
100
+ 150
mW
°C/W
W
°C/W
°C
Operating Ambient Temperature
UC3844, UC3845
UC2844, UC2845
TA
°C
0 to + 70
− 25 to + 85
Storage Temperature Range
Tstg
− 65 to + 150
°C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
1. Maximum Package power dissipation limits must be observed.
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
Line Regulation (VCC = 12 V to 25 V)
Regline
−
2.0
20
−
2.0
20
Load Regulation (IO = 1.0 mA to 20 mA)
Regload
−
3.0
25
−
3.0
25
Temperature Stability
TS
−
0.2
−
−
0.2
−
Total Output Variation over Line, Load, Temperature
Vref
4.9
−
5.1
4.82
−
5.18
Output Noise Voltage (f = 10 Hz to kHz, TJ = 25°C)
Vn
−
50
−
−
50
−
Long Term Stability (TA = 125°C for 1000 Hours)
S
−
5.0
−
−
5.0
−
Output Short Circuit Current
ISC
− 30 − 85 − 180 − 30 − 85 − 180
OSCILLATOR SECTION
Frequency
TJ = 25°C
TA = Tlow to Thigh
fosc
47
52
57
47
52
57
46
−
60
46
−
60
Frequency Change with Voltage (VCC = 12 V to 25 V) Dfosc/DV
−
0.2
1.0
−
0.2
1.0
Frequency Change with Temperature
TA = Tlow to Thigh
Dfosc/DT
−
5.0
−
−
5.0
−
Oscillator Voltage Swing (Peak−to−Peak)
Discharge Current (Vosc = 2.0 V, TJ = 25°C)
Vosc
Idischg
−
1.6
−
−
10.8
−
−
1.6
−
−
10.8
−
ERROR AMPLIFIER SECTION
Voltage Feedback Input (VO = 2.5 V)
VFB
2.45
2.5
2.55 2.42
2.5
2.58
Input Bias Current (VFB = 2.7 V)
IIB
−
−0.1 −1.0
−
−0.1 −2.0
Open Loop Voltage Gain (VO = 2.0 V to 4.0 V)
AVOL
65
90
−
65
90
−
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 = 0°C for UC3844, UC3845
−25°C for UC2844, UC2845
Thigh = +70°C for UC3844, UC3845
+85°C for UC2844, UC2845
V
mV
mV
mV/°C
V
mV
mV
mA
kHz
%
%
V
mA
V
mA
dB
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