UC3845DR2G ON Semiconductor, UC3845DR2G Datasheet - Page 2
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UC3845DR2G
Manufacturer Part Number
UC3845DR2G
Description
IC CTRLR CURRENT MODE HP 14SOIC
Manufacturer
ON Semiconductor
Type
High Performance Current Mode Controllersr
Datasheet
1.UC3845DR2.pdf
(16 pages)
Specifications of UC3845DR2G
Pwm Type
Current Mode
Number Of Outputs
1
Frequency - Max
60kHz
Duty Cycle
50%
Voltage - Supply
8.2 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
14-SOIC (3.9mm Width), 14-SOL
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
SMD/SMT
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
UC3845DR2GOS
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