UC3844N ON Semiconductor, UC3844N Datasheet - Page 2

• Manufacturer Part Number: UC3844N
• Description: IC CTRLR CURRENT MODE HP 8DIP
• Manufacturer: ON Semiconductor
• Type: High Performance Current Mode Controllersr

Specifications of UC3844N

• Pwm Type: Current Mode
• Number Of Outputs: 1
• Frequency - Max: 60kHz
• Duty Cycle: 50%
• Voltage - Supply: 11.5 V ~ 25 V
• Buck: No
• Boost: Yes
• Flyback: Yes
• Inverting: Yes
• Doubler: No
• Divider: No
• Cuk: No
• Isolated: Yes
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 8-DIP (0.300", 7.62mm)
• Frequency-max: 60kHz
• Output Voltage Range: 4.9 V to 5.1 V
• Input Voltage Range: 30 V
• Operating Temperature Range: 0 C to + 70 C
• Mounting Style: Through Hole
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: UC3844NOS

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.
2. Adjust V
3. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible.
MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
REFERENCE SECTION
OSCILLATOR SECTION
ERROR AMPLIFIER SECTION
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
Operating Junction Temperature
Operating Ambient Temperature
Storage Temperature Range
Reference Output Voltage (I
Line Regulation (V
Load Regulation (I
Temperature Stability
Total Output Variation over Line, Load, Temperature
Output Noise Voltage (f = 10 Hz to kHz, T
Long Term Stability (T
Output Short Circuit Current
Frequency
Frequency Change with Voltage (V
Frequency Change with Temperature
Oscillator Voltage Swing (Peak−to−Peak)
Discharge Current (V
Voltage Feedback Input (V
Input Bias Current (V
Open Loop Voltage Gain (V
T
T
T
T
D Suffix, Plastic Package, Case 751A
N Suffix, Plastic Package, Case 626
UC3844, UC3845
UC2844, UC2845
low
J
A
A
= 25°C
= T
= T
Maximum Power Dissipation @ T
Thermal Resistance Junction−to−Air
Maximum Power Dissipation @ T
Thermal Resistance Junction−to−Air
= 0°C for UC3844, UC3845
−25°C for UC2844, UC2845
low
low
CC
to T
to T
above the Startup threshold before setting to 15 V.
high
high
Characteristics
O
CC
= 1.0 mA to 20 mA)
osc
FB
A
= 12 V to 25 V)
= 125°C for 1000 Hours)
= 2.7 V)
= 2.0 V, T
O
O
O
= 2.5 V)
= 2.0 V to 4.0 V)
= 1.0 mA, T
J
CC
= 25°C)
Rating
= 12 V to 25 V)
A
A
(V
= 25°C
= 25°C
J
J
CC
= 25°C)
= 25°C)
= 15 V, (Note 2), R
T
high
= +70°C for UC3844, UC3845
http://onsemi.com
+85°C for UC2844, UC2845
Df
Symbol
Df
Reg
Reg
I
A
dischg
V
osc/
osc/
V
V
V
f
I
T
V
I
osc
VOL
SC
S
osc
IB
ref
ref
FB
S
load
n
line
D
D
T
V
T
= 10 k, C
2
4.95
− 30
2.45
Min
4.9
47
46
65
−
−
−
−
−
−
−
−
−
−
T
= 3.3 nF, T
UC284X
− 85
10.8
−0.1
Typ
5.0
2.0
3.0
0.2
5.0
0.2
5.0
1.6
2.5
50
52
90
−
−
A
= T
(I
Symbol
CC
− 180
Max
5.05
2.55
−1.0
R
R
5.1
1.0
T
20
25
57
60
V
P
P
low
T
W
T
I
I
−
−
−
−
−
−
−
qJA
qJA
stg
O
O
+ I
in
D
D
A
J
to T
Z
)
high
4.82
− 30
2.42
Min
4.9
47
46
65
−
−
−
−
−
−
−
−
−
−
(Note 3), unless otherwise noted.)
− 0.3 to + 5.5
− 65 to + 150
− 25 to + 85
UC384X
0 to + 70
− 85
10.8
−0.1
Value
+ 150
Typ
5.0
2.0
3.0
0.2
5.0
0.2
5.0
1.6
2.5
1.25
50
52
90
862
145
100
−
−
1.0
5.0
30
10
− 180
Max
5.18
2.58
−2.0
5.1
1.0
20
25
57
60
−
−
−
−
−
−
−
°C/W
°C/W
Unit
mV/°C
mW
mA
mA
mJ
°C
°C
°C
W
Unit
kHz
A
V
mV
mV
mV
mA
mA
dB
mV
mA
%
%
V
V
V
V