AIC1570-CS Ver la hoja de datos (PDF) - Analog Intergrations

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AIC1570-CS

5-bit DAC, Synchronous PWM Power Regulator with LDO and Linear Controller

Analog Intergrations 

TYPICAL PERFORMANCE CHARACTERISTICS

UGATE

UGATE

AIC1570

LGATE

LGATE

FIG.1 The gate drive waveforms

60

CUGATE=CLGATE=CGATE

50 VCC=12V

40

CGATE=5000pF

30

CGATE=2000pF

20

10

CGATE=660pF

0

100

150

200

250

300

350

400

Switching Frequency (KHz)

FIG. 2 Bias Supply Current VS. Frequency

10000

1000

RT Pull Up to +12V

100

RT Pull Down to GND

10

1

100 150

200

250

450

300

350

400

Switching Frequency (KHz)

FIG. 3 RT Resistance VS. Frequency

SS (2V/div)

PGOOD (5V/div)

VOUT1 (1V/div)

VOUT2 (1V/div)

VOUT3 (1V/div)

SS

VDAC=3.5V

VDAC=2V

VDAC=1.3V

FIG.4 Soft Start Interval with 3 Outputs and PGOOD

FIG. 5 Soft Start Initiates PWM Output

5

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