ADP3157 View Datasheet(PDF) - Analog Devices

Part Name

Description

Manufacturer

ADP3157

5-Bit Programmable Synchronous Controller for Pentium® III Processors

Analog Devices 

100

VOUT = 3.5V

95

VOUT = 2.8V

90

85

VOUT = 2.0V

80

VOUT = 1.3V

75

70

SEE FIGURE 2

65

1.4 2.8 4.2 5.6 7 8.4 9.8 11.2 12.6 14

OUTPUT CURRENT – Amps

Figure 4. Efficiency vs. Output

Current

Typical Performance Characteristics–ADP3157

450

400

350

300

250

200

150

100

50

0

50 100 200 300 400 500 600 700 800

TIMING CAPACITOR – pF

Figure 5. Frequency vs. Timing

Capacitor

45

40

35

30

25

20

15

10

5

0

45

QGATE(TOTAL) = 100nC

58

83

134

397

OPERATING FREQUENCY – kHz

Figure 6. Supply Current vs. Oper-

ating Frequency

SEE FIGURE 2

PRIMARY

N-DRIVE

DRIVER OUTPUT

1

SECONDARY

N-DRIVE

DRIVER OUTPUT

2

DRIVE 1 AND 2 = 5V/DIV

500ns/DIV

Figure 7. Gate Switching Waveforms

SEE FIGURE 2

VCC = +12V

VIN = +5V

IOUT = 10A

100ns/DIV

Figure 8. Driver Transition

Waveforms

OUTPUT VOLTAGE

20mV/DIV

OUTPUT CURRENT

1A TO 19A

10␮s/DIV

Figure 10. Load Transient Response,

1 A–19 A of Figure 2 Circuit

VCC VOLTAGE

5V/DIV

3

REGULATOR

OUTPUT VOLTAGE

1V/DIV

4

10ms/DIV

Figure 11. Power-On Start-Up

Waveform

OUTPUT VOLTAGE

20mV/DIV

OUTPUT CURRENT

19A TO 1A

10␮s/DIV

Figure 9. Load Transient Response,

19 A–1 A of Figure 2 Circuit

25

TA = +25؇C

SEE FIGURE 13

20

15

10

5

0

OUTPUT ACCURACY – %

Figure 12. Output Accuracy

Distribution, VOUT = 2.0 V

REV. A

–5–

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