ISL78322 Datasheet, PDF (13/18 Pages) Intersil Corporation – Dual 2A/1.7A Low Quiescent Current 2.25MHz High Efficiency Synchronous Buck Regulator

ISL78322
Typical Operating Performance (Unless otherwise noted) operating conditions are:
T_A = +25°C, V_VIN = 2.8V to 5.5V, EN = V_IN, L₁ = L₂ = 1.2µH, C₁ = 10µF, C₂ = C₄ = 22µF, I_OUT1 = 0A to 2A, I_OUT2 = 0A to 1.7A. (Continued)
PG 1V/DIV
PG 1V/DIV
IL2 0.5A/DIV
V_OUT2 2V/DIV
LX2 2V/DIV
IL2 0.5A/DIV
V_OUT2 2V/DIV
LX2 2V/DIV
TB = 10µs/DIV
TB = 1µs/DIV
FIGURE 38. V_OUT2 HARD SHORT TO V_IN NEGATIVE CURRENT
WAVEFORMS AT HIGH LINE CHANNEL 2
LX1 5V/DIV
V_OUT1 2V/DIV
IL1 2A/DIV
PG 5V/DIV
TB = 5µs/DIV
FIGURE 40. OUTPUT SHORT CIRCUIT CHANNEL 1
FIGURE 39. RECOVERY FROM HARD SHORT NEGATIVE CURRENT
WAVEFORMS V_OUT2 CHANNEL 2
LX1 5V/DIV
V_OUT1 2V/DIV
IL1 2A/DIV
PG 5V/DIV
FIGURE 41. OUTPUT SHORT CIRCUIT RECOV^TE^BRY ¹CHA^/N^DIN^VEL 1
LX2 5V/DIV
LX2 5V/DIV
V_OUT2 1V/DIV
V_OUT2 1V/DIV
IL2 2A/DIV
PG 5V/DIV
TB = 5µs/DIV
IL2 2A/DIV
PG 5V/DIV
TB = 1ms/DIV
FIGURE 42. OUTPUT SHORT CIRCUIT CHANNEL 2
FIGURE 43. OUTPUT SHORT CIRCUIT RECOVERY CHANNEL 2
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FN7908.2
August 26, 2014