UC3842B datasheet(5/16 Pages) MOTOROLA

Part #	UC3842B

Description	HIGH PERFORMANCE CURRENT MODE CONTROLLERS

Download	16 Pages

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Manufacturer	MOTOROLA [Motorola, Inc]

Direct Link	http://www.freescale.com

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5 / 16 page

UC3842B, 43B UC2842B, 43B

5

MOTOROLA ANALOG IC DEVICE DATA

Figure 5. Error Amp Small Signal

Transient Response

Figure 6. Error Amp Large Signal

Transient Response

Figure 7. Error Amp Open Loop Gain and

Phase versus Frequency

Figure 8. Current Sense Input Threshold

versus Error Amp Output Voltage

Figure 9. Reference Voltage Change

versus Source Current

Figure 10. 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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