UC2845BD1G ON Semiconductor, UC2845BD1G Datasheet - Page 5
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UC2845BD1G
Manufacturer Part Number
UC2845BD1G
Description
IC CTRLR CURRENT MODE HP 8-SOIC
Manufacturer
ON Semiconductor
Datasheet
1.UC3844BDR2G.pdf
(19 pages)
Specifications of UC2845BD1G
Pwm Type
Current Mode
Number Of Outputs
1
Frequency - Max
275kHz
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
-25°C ~ 85°C
Package / Case
8-SOIC (3.9mm Width)
Frequency-max
275kHz
Duty Cycle (max)
48 % (Typ)
Output Voltage
4.95 V to 5.05 V
Output Current
1000 mA (Max)
Mounting Style
SMD/SMT
Switching Frequency
500 KHz
Operating Supply Voltage
30 V
Maximum Operating Temperature
85 C
Fall Time
50 ns
Minimum Operating Temperature
- 25 C
Rise Time
50 ns
Synchronous Pin
No
Topology
Boost or Flyback
Rohs Compliant
YES
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
- 4.0
- 8.0
- 20
- 12
- 16
- 20
- 24
100
80
60
40
20
0
0
10
0
Figure 6. Error Amp Open Loop Gain and
Figure 10. Reference Load Regulation
100
Figure 8. Reference Voltage Change
20
I
ref
Phase versus Frequency
T
, REFERENCE SOURCE CURRENT (mA)
A
versus Source Current
= 125°C
1.0 k
40
f, FREQUENCY (Hz)
Gain
2.0 ms/DIV
10 k
60
T
A
= 25°C
V
I
T
O
100 k
A
CC
= 1.0 mA to 20 mA
= 25°C
80
= 15 V
V
V
R
T
A
CC
O
L
T
= 25°C
= 100 k
= 2.0 V to 4.0 V
A
= 15 V
V
= - 55°C
CC
1.0 M
100
= 15 V
Phase
http://onsemi.com
10 M
120
120
150
180
30
60
90
0
5
110
90
70
50
1.2
1.0
0.8
0.6
0.4
0.2
- 55
0
0
V
Figure 9. Reference Short Circuit Current
CC
Figure 7. Current Sense Input Threshold
Figure 11. Reference Line Regulation
- 25
= 15 V
T
versus Error Amp Output Voltage
A
T
A
= 125°C
= 25°C
V
2.0
O
, ERROR AMP OUTPUT VOLTAGE (V
T
A
0
versus Temperature
, AMBIENT TEMPERATURE (°C)
T
25
2.0 ms/DIV
A
= - 55°C
4.0
50
V
T
A
CC
75
= 25°C
Ä Ä Ä Ä
Ä Ä Ä Ä
6.0
= 12 V to 25 V
V
R
CC
L
O
≤ 0.1 W
100
)
= 15 V
125
8.0