UC3845NG ON Semiconductor, UC3845NG Datasheet - Page 3

• Manufacturer Part Number: UC3845NG
• Description: IC CTRLR CURRENT MODE HP 8DIP
• Manufacturer: ON Semiconductor
• Type: High Performance Current Mode Controllersr

Specifications of UC3845NG

• 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: 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: Lead free / RoHS Compliant
• Other names: UC3845NGOS

4. Adjust V
5. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible.
6. This parameter is measured at the latch trip point with V
7. Comparator gain is defined as: A
ELECTRICAL CHARACTERISTICS
ERROR AMPLIFIER SECTION (continued)
CURRENT SENSE SECTION
OUTPUT SECTION
UNDERVOLTAGE LOCKOUT SECTION
PWM SECTION
TOTAL DEVICE
Unity Gain Bandwidth (T
Power Supply Rejection Ratio (V
Output Current
Output Voltage Swing
Current Sense Input Voltage Gain (Notes 6 & 7)
Maximum Current Sense Input Threshold (Note 6)
Power Supply Rejection Ratio
Input Bias Current
Propagation Delay (Current Sense Input to Output)
Output Voltage
Output Voltage with UVLO Activated
Output Voltage Rise Time (C
Output Voltage Fall Time (C
Startup Threshold
Minimum Operating Voltage After Turn−On
Duty Cycle
Power Supply Current (Note 4)
Power Supply Zener Voltage (I
T
Sink (V
Source (V
High State (R
Low State (R
V
Low State (I
High State (I
V
UCX844
UCX844
Maximum
Startup:
(V
(V
UCX845
UCX845
Minimum
low
CC
CC
CC
CC
= 0°C for UC3844, UC3845
= 12 V to 25 V (Note 6)
= 6.0 V, I
= 6.5 V for UCX845A,
14 V for UCX844) Operating
−25°C for UC2844, UC2845
O
CC
= 1.1 V, V
O
above the Startup threshold before setting to 15 V.
(I
(I
= 5.0 V, V
L
Sink
Sink
Sink
Sink
L
Sink
= 15 k to V
= 15 k to ground, V
Characteristics
= 20 mA)
= 200 mA)
= 20 mA)
= 200 mA)
= 1.0 mA
FB
FB
= 2.7 V)
J
= 25°C)
= 2.3 V)
ref
L
L
= 1.0 nF, T
, V
= 1.0 nF, T
CC
V
FB
CC
= 25 mA)
DV Output Compensation
= 2.7 V)
DV Current Sense Input
= 12 V to 25 V)
FB
= 2.3 V)
(V
J
J
= 25°C)
CC
= 25°C)
= 15 V, (Note 4), R
T
high
= +70°C for UC3844, UC3845
http://onsemi.com
+85°C for UC2844, UC2845
FB
= 0 V.
t
PLH(IN/OUT)
V
Symbol
V
OL(UVLO)
DC
I
PSRR
PSRR
DC
Source
CC(min)
T
I
V
V
V
V
BW
V
V
I
Sink
A
I
V
CC
= 10 k, C
OH
IB
OH
t
t
OL
OL
th
r
th
max
V
f
min
Z
3
T
= 3.3 nF, T
−0.5
2.85
Min
0.7
2.0
5.0
0.9
7.8
9.0
7.0
60
12
12
15
46
30
−
−
−
−
−
−
−
−
−
−
−
−
UC284X
−1.0
−2.0
13.5
13.4
Typ
150
A
1.0
6.2
0.8
3.0
1.0
0.1
1.6
0.1
8.4
7.6
0.5
70
12
70
50
50
16
10
48
12
36
−
= T
low
to T
Max
3.15
−10
300
150
150
1.1
1.1
0.4
2.2
1.1
9.0
8.2
1.0
17
11
50
17
−
−
−
−
−
−
−
−
0
−
high
(Note 5), unless otherwise noted.)
−0.5
2.85
14.5
Min
0.7
2.0
5.0
0.9
7.8
8.5
7.0
60
13
12
47
30
−
−
−
−
−
−
−
−
−
−
−
−
UC384X
−1.0
−2.0
13.5
13.4
Typ
150
1.0
6.2
0.8
3.0
1.0
0.1
1.6
0.1
8.4
7.6
0.5
70
12
70
50
50
16
10
48
12
36
−
Max
3.15
17.5
11.5
−10
300
150
150
1.1
1.1
0.4
2.2
1.1
9.0
8.2
1.0
50
17
−
−
−
−
−
−
−
−
0
−
MHz
Unit
V/V
mA
mA
dB
dB
mA
ns
ns
ns
%
V
V
V
V
V
V
V