MIC3832 查看數據表（PDF） - Micrel

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MIC3832

Current-Fed PWM Controllers

Micrel 

MIC3832/3833

Typical Characteristics

Reference Voltage vs.

Junction Temperature

5.06

5.04

5.02

5.00

4.98

4.96

4.94

-40 0 40 80 120 160

JUNCTION TEMPERATURE (°C)

1000

100

Oscillator Frequency

vs. Timing Resistance

85pF

Note 4

550pF

1.1nF

2.2nF

10.2nF

10

1

10

100

TIMING RESISTANCE (kΩ)

Voltage-Mode Max. Duty

Cycle vs. MDC Voltage

100

90

80

70

60

50

Note 5

40

30

20

10

0

012345

MDC CONTROL VOLTAGE (V)

Current Sense Threshold

vs. Error Amplifier Output

3

VII = 3

25°C

2

125°C

-55°C

VII = 2

1

VII = 1

0

0123456

ERROR AMP OUTPUT (V)

April 1998

Micrel

MIC3832 Undervoltage

Lockout vs. Junct. Temp.

16.4

16.2

ON

16.0

15.8

15.6

10.0-40 0

40 80 120 160

9.8

9.6

9.4 OFF

9.2

-40 0

40 80 120 160

JUNCTION TEMPERATURE (°C)

Discharge Time vs.

Timing Capacitance

10

25°C

-40°C

125°C

1

0.1

1

2 3 4 5 6 8 10

TIMING CAPACITOR (nF)

Output Saturation Voltage

vs. Output Sink Current

5

4

25°C

3

-55°C

2

125°C

1

0

0 0.2 0.4 0.6 0.8 1

OUTPUT SINK CURRENT (A)

MIC3833 Undervoltage

Lockout vs. Junct. Temp.

9.0

8.5

ON

8.0

OFF

7.5

7.0

-40 0

40 80 120 160

JUNCTION TEMPERATURE (°C)

Oscillator Discharge

Current vs. Junct. Temp.

5

4

3

2

4

1

0

-40 0 40 80 120 160

JUNCTION TEMPERATURE (°C)

Output Voltage Drop vs.

Output Source Current

5

4

125°C

3

-55°C

2

25°C

1

0

0 0.2 0.4 0.6 0.8 1

OUTPUT SOURCE CURRENT (A)

Error Amplifier Open-Loop

Frequency Response

100

45

AMPLITUDE

75

0

50

-45

25

PHASE

0

-90

-135

-25

-180

FREQUENCY (Hz)

4-139

Note 4:

Note 5:

CMR (pin 12) connected to CT

(pin 15).

CMR (pin 12) connected to CT

(pin 15). MDC voltage measured

at MDC/SS (pin 11).

CT = 1nF, RT = 10kΩ.

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