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參數(shù)資料
| 型號： | ISL6560EVAL1 |
| 廠商： | Intersil Corporation |
| 英文描述： | Microprocessor CORE Voltage Regulator Two-Phase Buck PWM Controller |
| 中文描述： | 微處理器核心電壓調節(jié)兩相降壓PWM控制器 |
| 文件頁數(shù)： | 13/14頁 |
| 文件大小： | 396K |
| 代理商： | ISL6560EVAL1 |
13
FN9011.3
ISL6560 Supply Design Sequence
Please note several changes from the computations in the
body of the data sheet. An operating frequency of 400kHz
was chosen. A 15mV offset voltage was added to the no-
load output voltage to show the design procedure.
ISL6560 Supply Design Sequence
A. Specifications:
B. Calculate R
OUT
:
C. Determine Frequency Setting Capacitor CT:
From curve of Figure A, for 400kHz use 120pF.
D. Select Inductor Ripple Current (
I
L
):
Choose 40% of IOUT:
E. Determine the Inductors:
F. Output Capacitors:
G. Input Capacitor’s RMS Current:
Use the curve of Figure B.
G. Input Capacitor’s RMS Current:
(continued)
For 40A with a duty cycle (D) of:
H. Current Sense Resistor (R
SENSE
):
V
Use a 5m
resistor
I. R
SENSE
Dissipation:
IRMS
J. R
L
Selection:
Input Voltage: 12V
Output Voltage: VDAC + 15mV
Output Voltage for Calculations:
V
DAC
= 1.8V + 15mV
Droop Voltage: 65mV
Oscillator Frequency: 400kHz (f
SW
)
Output Current: 40A
ROUT
V
OUT
------I
40A
1.63m
=
=
=
1000
100
3000
F
CAPACITOR CT (pF)
100 150 200
250 300
0
50
350 400
450 500
FIGURE A. OSCILLATOR FREQUENCY vs. TIMING
CAPACITOR
Or 8A / Channel
IL
40A
0.4
×
16A
=
=
L
-----------
VOUT
–
IL
×
VIN
VIN
×
1.8V
×
–
8A
200kHz
12V
×
=
=
956nH
=
Sanyo 1500
μ
F, 4V OS-CON Capacitors
have an ESR < 10m
Six capacitors < 1.66m
Total Capacitance = 9mF
CapacitorESR
ROUT
1.63m
=
0.3
0.2
0.1
0
0
0.1
0.2
0.3
0.4
0.5
DUTY CYCLE (V
O
/ V
IN
)
C
FIGURE B.
CURRENT MULTIPLIER vs. DUTY CYCL
E
D
V
IN
---V
12V
0.15
=
=
=
The multiplier from Figure B is 0.24.
I
RMS
0.24
=
40A
×
9.6A
=
Panasonic 470
μ
F, 16V Rubycon ZA series capacitors
have a RMS current rating of 1.6A.
Six capacitors were selected.
RSENSE
(
)
MIN
I
-----2
--------2
+
I
8A
+
20A
5.07m
=
=
=
Power
∴
IP
2
D
×
R
SENSE
×
=
Where: I
P
= 34.4A -4A = 30.4A
Power
0.69W per channel or 1.38W for both channels
=
(Using half the ripple current)
I
PEAK
D
=
Power
30.4
A
=
2
0.15
×
5m
×
Used two 10m
, 1W resistors in parallel.
RL
ni
R
OUT
×
2
×
gm
5m
1.63m
×
2
×
×
2.2mS
8.7k
=
=
=
gm
RL
×
2.2mS
8.7k
19.1
=
×
=
=
gm Amplifier Gain
ISL6560
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