ISL8022 Просмотр технического описания (PDF) - Intersil

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ISL8022

Dual 2A/1.7A Low Quiescent Current 2.25MHz High Efficiency Synchronous Buck Regulator

Intersil 

ISL8022

Typical Operating Performance (Unless otherwise noted) operating conditions are:

TA = +25°C, VVIN = 2.8V to 5.5V, EN = VIN, L1 = L2 = 1.2µH, C1 = 10µF, C2 = C4 = 22µF, IOUT1 = 0A to 2A,

IOUT2 = 0A to 1.7A. (Continued)

LX1 2V/DIV

VOUT1 RIPPLE 20mV/DIV

IL1 0.2A/DIV

SYNCH 2V/DIV

TB = 100ns/DIV

FIGURE 31. STEADY STATE OPERATION AT NO LOAD

(PFM) WITH FREQUENCY = 8MHz

CHANNEL 1

LX2 2V/DIV

VOUT2 RIPPLE 20mV/DIV

IL2 0.2A/DIV

SYNCH 2V/DIV

TB = 100ns/DIV

FIGURE 32. STEADY STATE OPERATION AT NO LOAD

(PFM) WITH FREQUENCY = 8MHz

CHANNEL 2

LX1 2V/DIV

VOUT1 RIPPLE 20mV/DIV

IL1 1A/DIV

SYNCH 2V/DIV

TB = 100ns/DIV

LX2 2V/DIV

VOUT2 RIPPLE 20mV/DIV

IL2 0.5A/DIV

SYNCH 2V/DIV

TB = 100ns/DIV

FIGURE 33. STEADY STATE OPERATION AT FULL LOAD

(PFM) WITH FREQUENCY = 8MHz

CHANNEL 1

FIGURE 34. STEADY STATE OPERATION AT FULL LOAD

(PFM) WITH FREQUENCY = 8MHz

CHANNEL 2

LX1 2V/DIV

VOUT1 2V/DIV

IL1 0.5A/DIV

PG 1V/DIV

TB = 1µs/DIV

FIGURE 35. VOUT1 HARD SHORT TO VIN NEGATIVE

CURRENT WAVEFORMS AT HIGH LINE

CHANNEL 1

12

PG 1V/DIV

IL1 0.5A/DIV

VOUT1 2V/DIV

LX1 2V/DIV

TB = 1µs/DIV

FIGURE 36. RECOVERY FROM HARD SHORT NEGATIVE

CURRENT WAVEFORMS VOUT1 CHANNEL 1

FN7650.1

August 25, 2010

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