UC2843B datasheet(5/20 Pages) ONSEMI

Part #	UC2843B

Description	HIGH PERFORMANCE CURRENT MODE CONTROLLERS

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Manufacturer	ONSEMI [ON Semiconductor]

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UC3842B, UC3843B, UC2842B, UC2843B, NCV3843BV

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5

Figure 6. Error Amp Small Signal

Transient Response

Figure 7. Error Amp Large Signal

Transient Response

Figure 8. Error Amp Open Loop Gain and

Phase versus Frequency

Figure 9. Current Sense Input Threshold

versus Error Amp Output Voltage

Figure 10. Reference Voltage Change

versus Source Current

Figure 11. Reference Short Circuit Current

versus Temperature

-20

10 M

10

f, FREQUENCY (Hz)

Gain

Phase

VCC = 15 V

VO = 2.0 V to 4.0 V

RL = 100 K

TA = 25°C

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 (V)

0

0.2

0.4

0.6

0.8

1.0

1.2

2.0

4.0

6.0

8.0

VCC = 15 V

TA = 25°C

TA = -55°C

TA = 125°C

VCC = 15 V

TA = -55°C

TA = 25°C

-16

0

Iref, REFERENCE SOURCE CURRENT (mA)

20

40

60

80

100

120

-12

-8.0

-4.0

0

-20

-24

TA = 125°C

VCC = 15 V

RL ≤ 0.1 Ω

50

-55

TA, AMBIENT TEMPERATURE (°C)

-25

0

25

50

75

100

125

70

90

110

1.0 µs/DIV

0.5 µs/DIV

2.55 V

2.50 V

2.45 V

3.0 V

2.5 V

2.0 V

VCC = 15 V

AV = -1.0

TA = 25°C

VCC = 15 V

AV = -1.0

TA = 25°C

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