UC3845DR2G ON Semiconductor, UC3845DR2G Datasheet - Page 4
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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
2.55 V
2.45 V
2.5 V
− 20
100
5.0
2.0
1.0
80
60
40
20
10
50
20
10
0
0
10
10 k
NOTE: Output switches
at one−half the oscillator
frequency.
Figure 6. Error Amp Open Loop Gain and
20 k
100
Figure 4. Error Amp Small Signal
Figure 2. Timing Resistor versus
f
Phase versus Frequency
osc
, OSCILLATOR FREQUENCY (Hz)
Oscillator Frequency
Transient Response
1.0 k
Gain
50 k
f, FREQUENCY (Hz)
0.5 ms/DIV
10 k
100 k
200 k
100 k
V
V
R
T
A
CC
O
L
= 25°C
= 100 K
= 2.0 V to 4.0 V
= 15 V
V
A
T
V
A
CC
V
T
1.0 M
Phase
A
500 k
CC
= −1.0
= 25°C
= 25°C
= 15 V
= 15 V
http://onsemi.com
1.0 M
10 M
0
30
60
90
120
150
180
4
3.0 V
2.5 V
2.0 V
70
65
60
55
50
75
1.2
1.0
0.8
0.6
0.4
0.2
10 k
0
0
V
CC
Figure 7. Current Sense Input Threshold
20 k
Figure 5. Error Amp Large Signal
Figure 3. Output Deadtime versus
= 15 V
versus Error Amp Output Voltage
T
A
f
V
osc
= 125°C
T
O
2.0
A
, ERROR AMP OUTPUT VOLTAGE (V)
, OSCILLATOR FREQUENCY (Hz)
Oscillator Frequency
Transient Response
= 25°C
C
T
50 k
= 10 nF
1.0 ms/DIV
T
100 k
A
= −55°C
4.0
5.0 nF
200 k
500
pF
6.0
2.0 nF
V
A
T
V
A
CC
500 k
= −1.0
= 25°C
200
pF
= 15 V
1.0 nF
100
pF
1.0 M
8.0