ISL62882 Datasheet, PDF (38/42 Pages) Intersil Corporation – Multiphase PWM Regulator for IMVP-6.5 Mobile CPUs and GPUs

ISL62882, ISL62882B
Typical Performance (Continued)
Phase Margin
Gain
FIGURE 50. TRANSIENT RESPONSE WITH
OVERSHOOT REDUCTION FUNCTION
ENABLED, V_IN = 19V, VID = 0.95V,
I_O = 12A/51A, di/dt = “FASTEST”,
Ch1: PHASE1, Ch2: V_O, Ch3: N/A, Ch4:
LGATE1
1000
900
800
700
600
500
400
300
200
100
0
0
SPEC
V_IN = 12V
V_IN = 8V
V_IN = 19V
5 10 15 20 25 30 35 40 45 50
I_OUT (A)
FIGURE 52. IMON, VID = 1.075
FIGURE 51. 2-PHASE CPU MODE REFERENCE DESIGN
LOOP GAIN T2(s) MEASUREMENT RESULT
5.0
4.5
4.0
3.5
3.0
2.5 ^{PSI# = 1, DPRSLPVR = 0, 2-Phase CCM}
2.0
1.5
1.0
0.5 _{PSI# = 0, DPRSLPVR = 0, 1-Phase DE}
0.0
1k
10k
100k
1M
FREQUENCY (Hz)
FIGURE 53. REFERENCE DESIGN FDIM RESULT
FIGURE 54. 1-PHASE GPU MODE SOFT-START,
DPRSLPVR=0, V_IN = 8V, I_O = 0A,
VID = 1.2375V, Ch1: PHASE1, Ch2: V_O
38
FIGURE 55. 1-PHASE GPU MODE SHUT DOWN,
V_IN = 8V, I_O = 1A, VID = 1.2375V, Ch1:
PHASE1, Ch2: V_O
FN6890.2
April 29, 2010