UC3842B, UC3843B, UC2842B, UC2843B, NCV3843BV
MAXIMUM RATINGS
Rating
Bias and Driver Voltages (Zero Series Impedance, see also Total Device spec)
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, SO–14 Case 751A
Maximum Power Dissipation @ T
A
= 25°C
Thermal Resistance, Junction–to–Air
D1 Suffix, Plastic Package, SO–8 Case 751
Maximum Power Dissipation @ T
A
= 25°C
Thermal Resistance, Junction–to–Air
N Suffix, Plastic Package, Case 626
Maximum Power Dissipation @ T
A
= 25°C
Thermal Resistance, Junction–to–Air
Operating Junction Temperature
Operating Ambient Temperature
UC3842B, UC3843B
UC2842B, UC2843B
UC3842BV, UC3843BV, NCV3843BV
Storage Temperature Range
Symbol
V
CC
, V
C
(I
CC
+ I
Z
)
I
O
W
V
in
I
O
Value
30
30
1.0
5.0
– 0.3 to + 5.5
10
Unit
V
mA
A
µJ
V
mA
P
D
R
θJA
P
D
R
θJA
P
D
R
θJA
T
J
T
A
862
145
702
178
1.25
100
+150
0 to + 70
– 25 to + 85
–40 to +105
mW
°C/W
mW
°C/W
W
°C/W
°C
°C
T
stg
– 65 to +150
°C
ELECTRICAL CHARACTERISTICS
(V
CC
= 15 V [Note 2], R
T
= 10 k, C
T
= 3.3 nF. For typical values T
A
= 25°C, for min/max values
T
A
is the operating ambient temperature range that applies [Note 3], unless otherwise noted.)
UC284XB
Characteristics
REFERENCE SECTION
Reference Output Voltage (I
O
= 1.0 mA, T
J
= 25°C)
Line Regulation (V
CC
= 12 V to 25 V)
Load Regulation (I
O
= 1.0 mA to 20 mA)
Temperature Stability
Total Output Variation over Line, Load, and Temperature
Output Noise Voltage (f = 10 Hz to 10 kHz, T
J
= 25°C)
Long Term Stability (T
A
= 125°C for 1000 Hours)
Output Short Circuit Current
OSCILLATOR SECTION
Frequency
T
J
= 25°C
T
A
= T
low
to T
high
T
J
= 25°C (R
T
= 6.2 k, C
T
= 1.0 nF)
Frequency Change with Voltage (V
CC
= 12 V to 25 V)
Frequency Change with Temperature, T
A
= T
low
to T
high
Oscillator Voltage Swing (Peak–to–Peak)
Discharge Current (V
OSC
= 2.0 V)
T
J
= 25°C
T
A
= T
low
to T
high
(UC284XB, UC384XB)
T
A
= T
low
to T
high
(UC384XBV)
f
OSC
49
48
225
∆f
OSC
/∆V
∆f
OSC
/∆T
V
OSC
I
dischg
7.8
7.5
–
8.3
–
–
8.8
8.8
–
7.8
7.6
7.2
8.3
–
–
8.8
8.8
8.8
–
–
–
52
–
250
0.2
1.0
1.6
55
56
275
1.0
–
–
49
48
225
–
–
–
52
–
250
0.2
0.5
1.6
55
56
275
1.0
–
–
%
%
V
mA
kHz
V
ref
Reg
line
Reg
load
T
S
V
ref
V
n
S
I
SC
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
UC384XB, XBV
Min
Typ
Max
Unit
1. Maximum Package power dissipation limits must be observed.
2. Adjust V
CC
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.
T
low
= 0°C for UC3842B, UC3843B; –25°C for UC2842B, UC2843B; –40°C for UC3842BV, UC3843BV
T
high
= +70°C for UC3842B, UC3843B; +85°C for UC2842B, UC2843B; +105°C for UC3842BV, UC3843BV
NCV3843BV: T
low
= –40°C, T
high
= +105°C. Guaranteed by design. NCV prefix is for automotive and other applications requiring site and
change control.
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