ISL78268 Datasheet, PDF (18/33 Pages) Intersil Corporation – Integrated 2A sourcing

ISL78268
Typical Performance
All the performance curves are taken from the Evaluation Board (ISL78268EVAL1Z) unless otherwise noted. (Continued)
V_OUT (AC) :200mV/DIV
V_OUT (AC) :200mV/DIV
COMP:
500mV/DIV
(1.5V DC-OFFSET)
COMP: (1.5V DC-OFFSET)
500mV/DIV
I_L: 3A/DIV
PH: 10V/DIV
500µs/DIV
FIGURE 30. TRANSIENT RESPONSE: FORCED-PWM MODE,
V_IN = 36V, V_OUT = 12V, I_OUT = 0.1A TO 4.5A, L = 4.7µH,
C_OUT = 98µF
PH:20V/DIV
SS: 2V/DIV
560ms
V_OUT : 5V/DIV
I_L: 3A/DIV
100ms/DIV
FIGURE 32. HICCUP: ACL, V_IN = 30V, V_OUT = 12V, R_IMON = 156kΩ
V_OUT : 5V/DIV
I_L: 3A/DIV
PH: 10V/DIV
500µs/DIV
FIGURE 31. TRANSIENT RESPONSE: FORCED-PWM MODE,
V_IN = 36V, V_OUT = 12V, I_OUT = 1A TO 3A, L = 4.7µH,
C_OUT = 98µF
6
5
4
3
2
1
00
0.05
0.10
0.15
0.20
0.25
0.30
I_OUT (A)
FIGURE 33. INTERNAL LDO LOAD REGULATION: V_IN = 36V,
T_A = +25°C
V_OUT : 5V/DIV
I_OUT: 1A/DIV
IMON/DE: 0.5V/DIV
I_OUT: 1A/DIV
IMON/DE: 0.5V/DIV
PH: 20V/DIV
20ms/DIV
FIGURE 34. AVERAGE CONSTANT OUTPUT CURRENT CONTROL,
V_IN = 20V, V_OUT (SETTING) = 12V, C_IMON = 1nF,
R_IMON = 130kΩ, ACL = 4.05A, R_L = 5.0Ω TO 2.0Ω,
F_LOAD = 10Hz, DUTY OF LOAD CHANGE = 50%
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PH: 20V/DIV
20ms/DIV
FIGURE 35. AVERAGE CONSTANT OUTPUT CURRENT CONTROL,
V_IN = 36V, V_OUT (SETTING) = 12V, C_IMON = 1nF,
R_IMON = 130kΩ, ACL = 4.05A, R_L = 5.0Ω TO 2.0Ω,
F_LOAD = 10Hz, DUTY OF LOAD CHANGE = 50%
FN8657.3
December 12, 2014