MC33363_06 datasheet(4/14 Pages) ONSEMI

Part #	MC33363

Description	High Voltage Switching Regulator

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MC33363

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RT, TIMING RESISTOR (kW)

1.0

7.0

1.0 M

VCC = 20 V

CT = 1.0 mF

TA = 25°C

Figure 1. Oscillator Frequency

versus Timing Resistor

RT, TIMING RESISTOR (kW)

Figure 2. Power Switch Peak Drain Current

versus Timing Resistor

500 k

200 k

100 k

50 k

20 k

10 k

0.8

0.6

0.4

0.2

0.1

10

15

20

30

50

7.0

10

15

20

30

40

70

VCC = 20 V

TA = 25°C

CT = 100 pF

CT = 200 pF

CT = 500 pF

CT = 1.0 nF

CT = 2.0 nF

CT = 5.0 nF

CT = 10 nF

Inductor supply voltage and inductance value are

adjusted so that Ipk turn−off is achieved at 5.0 ms.

70

50

1.0

70

7.0

0.8

TIMING RESISTOR RATIO

Figure 3. Oscillator Charge/Discharge

Current versus Timing Resistor

RT, TIMING RESISTOR (kW)

Figure 4. Maximum Output Duty Cycle

versus Timing Resistor Ratio

0.5

0.3

0.2

0.15

0.1

0.08

60

50

40

30

10

15

20

30

70

2.0

3.0

5.0

7.0

10

RD/RT Ratio

Discharge Resistor

Pin 6 to GND

VCC = 20 V

CT = 2.0 nF

TA = 25°C

RC/RT Ratio

Charge Resistor

Pin 6 to Vreg

VCC = 20 V

TA = 25°C

50

0

10

100

IO, OUTPUT LOAD CURRENT (mA)

f, FREQUENCY (Hz)

Figure 5. Error Amp Open Loop Gain and

Phase versus Frequency

Figure 6. Error Amp Output Saturation

Voltage versus Load Current

80

60

40

20

0

−20

−1.0

−2.0

2.0

1.0

0

100

1.0 k

10 k

100 k

1.0 M

10 M

0.2

0.4

0.6

0.8

1.0

0

30

60

90

120

150

180

VCC = 20 V

VO = 1.0 to 4.0 V

RL = 5.0 MW

CL = 2.0 pF

TA = 25°C

Gain

Phase

Source Saturation

(Load to Ground)

Sink Saturation

(Load to Vref)

VCC = 20 V

TA = 25°C

GN

D

Vref

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MC33363 Datasheet(PDF) 4 Page - ON Semiconductor

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