UC3842A, 43A UC2842A, 43A
MAXIMUM RATINGS
Rating
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
D Suffix, Plastic Package
Maximum Power Dissipation @ TA = 25°C
Thermal Resistance, Junction–to–Air
N Suffix, Plastic Package
Maximum Power Dissipation @ TA = 25°C
Thermal Resistance, Junction–to–Air
Operating Junction Temperature
Operating Ambient Temperature
UC3842A, UC3843A
UC2842A, UC2843A
Storage Temperature Range
Symbol
(ICC + IZ)
IO
W
Vin
IO
Value
30
1.0
5.0
– 0.3 to + 5.5
10
Unit
mA
A
µJ
V
mA
PD
R
θJA
PD
R
θJA
TJ
TA
862
145
1.25
100
+ 150
0 to + 70
– 25 to + 85
mW
°C/W
W
°C/W
°C
°C
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.)
UC284XA
Characteristics
REFERENCE SECTION
Reference Output Voltage (IO = 1.0 mA, TJ = 25°C)
Line Regulation (VCC = 12 V to 25 V)
Load Regulation (IO = 1.0 mA to 20 mA)
Temperature Stability
Total Output Variation over Line, Load, Temperature
Output Noise Voltage (f = 10 Hz to 10 kHz, TJ = 25°C)
Long Term Stability (TA = 125°C for 1000 Hours)
Output Short Circuit Current
OSCILLATOR SECTION
Frequency
TJ = 25°C
TA = Tlow to Thigh
Frequency Change with Voltage (VCC = 12 V to 25 V)
Frequency Change with Temperature
TA = Tlow to Thigh
Oscillator Voltage Swing (Peak–to–Peak)
Discharge Current (Vosc = 2.0 V)
TJ = 25°C
TA = Tlow to Thigh
fosc
47
46
∆f
osc/
∆
V
∆f
osc/
∆
T
Vosc
Idischg
7.5
7.2
8.4
–
9.3
9.5
7.5
7.2
8.4
–
9.3
9.5
–
–
–
52
–
0.2
5.0
1.6
57
60
1.0
–
–
47
46
–
–
–
52
–
0.2
5.0
1.6
57
60
1.0
–
–
%
%
V
mA
kHz
Vref
Regline
Regload
TS
Vref
Vn
S
ISC
4.95
–
–
–
4.9
–
–
– 30
5.0
2.0
3.0
0.2
–
50
5.0
– 85
5.05
20
25
–
5.1
–
–
– 180
4.9
–
–
–
4.82
–
–
– 30
5.0
2.0
3.0
0.2
–
50
5.0
– 85
5.1
20
25
–
5.18
–
–
– 180
V
mV
mV
mV/°C
V
µV
mV
mA
Symbol
Min
Typ
Max
Min
UC384XA
Typ
Max
Unit
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 UC3842A, UC3843A
Thigh = +70°C for UC3842A, UC3843A
Tlow =
–25°C for UC2842A, UC2843A
Thigh =
+85°C for UC2842A, UC2843A
2
MOTOROLA ANALOG IC DEVICE DATA
ONSEMI [ ON SEMICONDUCTOR ]
