UC3845BDR2G datasheet(5/19 Pages) ONSEMI

Part #	UC3845BDR2G

Description	High Performance Current Mode Controllers

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Manufacturer	ONSEMI [ON Semiconductor]

Direct Link	http://www.onsemi.com

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UC3844B, UC3845B, UC2844B, UC2845B

http://onsemi.com

5

-20

10 M

10

f, FREQUENCY (Hz)

Gain

Phase

0

30

60

90

120

150

180

100

1.0 k

10 k

100 k

1.0 M

0

20

40

60

80

100

0

VO, ERROR AMP OUTPUT VOLTAGE (VO)

0

0.2

0.4

0.6

0.8

1.0

1.2

2.0

4.0

6.0

8.0

TA = -55°C

VCC = 15 V

RL ≤ 0.1 W

Figure 6. Error Amp Open Loop Gain and

Phase versus Frequency

Figure 7. Current Sense Input Threshold

versus Error Amp Output Voltage

Figure 8. Reference Voltage Change

versus Source Current

Figure 9. Reference Short Circuit Current

versus Temperature

-16

0

Iref, REFERENCE SOURCE CURRENT (mA)

20

40

60

80

100

120

-12

-8.0

-4.0

0

50

-55

TA, AMBIENT TEMPERATURE (°C)

-25

0

25

50

75

100

125

70

90

110

-20

-24

TA = 125°C

VCC = 15 V

VO = 2.0 V to 4.0 V

RL = 100 k

TA = 25°C

VCC = 15 V

TA = 25°C

2.0 ms/DIV

VCC = 12 V to 25 V

TA = 25°C

VCC = 15 V

IO = 1.0 mA to 20 mA

TA = 25°C

Figure 10. Reference Load Regulation

Figure 11. Reference Line Regulation

VCC = 15 V

TA = 125°C

TA = 25°C

TA = -55°C

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