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ER3105DI Datasheet, PDF (11/25 Pages) Altera Corporation – 500mA Wide VIN Synchronous Buck Regulator
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Efficiency Curves
FSW = 500kHz, TA = +25°C (Continued)
3.350
3.348
3.346
VIN = 15V
3.344
3.342
VIN = 12V
3.340
3.338
3.336
0
VIN = 5V
VIN = 33V
VIN = 24V
0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50
OUTPUT LOAD (A)
FIGURE 28. VOUT REGULATION vs LOAD, PWM, VOUT = 3.3V
1.812
1.811
1.810
VIN = 15V
1.809
1.808
1.807
VIN = 12V
1.806
1.805
1.804
1.803
0
VIN = 5V
0.05
0.10
VIN = 33V
0.15 0.20 0.25 0.30 0.35
OUTPUT LOAD (A)
VIN = 24V
0.40 0.45
0.50
FIGURE 30. VOUT REGULATION vs LOAD, PWM, VOUT = 1.8V
Typical Performance Curves
VIN = 24V, VOUT = 3.3V, FSW = 800kHz, TA = +25°C.
SW 20V/DIV
VOUT 2V/DIV
EN 20V/DIV
POK 2V/DIV
5ms/DIV
FIGURE 32. START-UP AT NO LOAD, PFM
Page 11
3.360
3.355
VIN = 33V
3.350
3.345
VIN = 12V
VIN = 15V
3.340
VIN = 5V
3.335
0
VIN = 24V
0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50
OUTPUT LOAD (A)
FIGURE 29. VOUT REGULATION vs LOAD, PFM, VOUT = 3.3V
1.820
1.818
1.816
VIN = 15V
1.814
1.812
VIN = 12V
1.810
1.808
VIN = 33V
1.806
VIN = 5V
1.804
VIN = 24V
1.802
0 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50
OUTPUT LOAD (A)
FIGURE 31. VOUT REGULATION vs LOAD, PFM, VOUT = 1.8V
SW 20V/DIV
VOUT 2V/DIV
EN 20V/DIV
POK 2V/DIV
5ms/DIV
FIGURE 33. START-UP AT NO LOAD, PWM
March 2014 Altera Corporation
09616
ER3105DI 500mA Wide VIN Synchronous Buck Regulator
March 14, 2014
Rev A
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