UC3844B datasheet(5/16 Pages) MOTOROLA

5 / 16 page

UC3844B, 45B UC2844B, 45B

MOTOROLA ANALOG IC DEVICE DATA

–20

10 M

f, FREQUENCY (Hz)

Gain

Phase

120

150

180

100

1.0 k

10 k

100 k

1.0 M

100

VO, ERROR AMP OUTPUT VOLTAGE (VO)

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 Ω

Figure 5. Error Amp Open Loop Gain and

Phase versus Frequency

Figure 6. Current Sense Input Threshold

versus Error Amp Output Voltage

Figure 7. Reference Voltage Change

versus Source Current

Figure 8. Reference Short Circuit Current

versus Temperature

–16

Iref, REFERENCE SOURCE CURRENT (mA)

100

120

–12

– 8.0

– 4.0

–55

TA, AMBIENT TEMPERATURE (°C)

– 25

100

125

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 9. Reference Load Regulation

Figure 10. Reference Line Regulation

VCC = 15 V

TA = 125°C

TA = 25°C

TA = – 55°C

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