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ISL6560CB Datasheet

  • ISL6560CB

  • Microprocessor CORE Voltage Regulator Two-Phase Buck PWM Con...

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  • 14頁

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ISL6560
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.
F. Output Capacitors:
Capacitor ESR
鈮?/div>
R OUT = 1.63m鈩?/div>
Sanyo 1500碌F, 4V OS-CON Capacitors
have an ESR < 10m鈩?/div>
Six capacitors < 1.66m鈩?/div>
Total Capacitance = 9mF
ISL6560 Supply Design Sequence
A. Specifications:
Output Current:
Input Voltage:
40A
12V
G. Input Capacitor鈥檚 RMS Current:
Use the curve of Figure B.
CURRENT MULTIPLIER
0.3
Output Voltage: VDAC + 15mV
Output Voltage for Calculations:
V
DAC
= 1.8V + 15mV
Droop Voltage: 65mV
Oscillator Frequency: 400kHz (f
SW
)
0.2
0.1
0
0
0.1
0.2
0.3
DUTY CYCLE (V
O
/ V
IN
)
0.4
0.5
B. Calculate R
OUT
:
R
OUT
V
DROOP
65mV
= ----------------------- = --------------- = 1.63m鈩?/div>
-
-
I
OUT
40A
FIGURE B.
CURRENT MULTIPLIER vs. DUTY CYCL
E
G. Input Capacitor鈥檚 RMS Current:
(continued)
C. Determine Frequency Setting Capacitor CT:
From curve of Figure A, for 400kHz use 120pF.
3000
For 40A with a duty cycle (D) of:
V
OUT
1.8V
D = --------------- = ----------- = 0.15
-
V
IN
12V
The multiplier from Figure B is 0.24.
I
RMS
= 0.24
脳
40A = 9.6A
FREQUENCY (kHz)
1000
Panasonic 470碌F, 16V Rubycon ZA series capacitors
have a RMS current rating of 1.6A.
Six capacitors were selected.
100
0
50 100 150 200 250 300 350 400
CAPACITOR CT (pF)
450 500
H. Current Sense Resistor (R
SENSE
):
V
CS
(
TH
)MIN
142mV
-
-
R SENSE = ----------------------------------------- = ------------------------ = 5.07m鈩?/div>
20A + 8A
I
OUT
I
RIPPLE
------------ + ---------------------
-
-
2
2
Use a 5m鈩?resistor
FIGURE A. OSCILLATOR FREQUENCY vs. TIMING
CAPACITOR
D. Select Inductor Ripple Current (鈭咺
L
):
Choose 40% of IOUT:
鈭咺
L = 40A
脳
0.4 = 16A
Or 8A / Channel
I. R
SENSE
Dissipation:
I RMS = I
PEAK
D
鈭?/div>
Power = I
2
P
脳
D
脳
R
SENSE
(Using half the ripple current)
Where: I
P
= 34.4A -4A = 30.4A
E. Determine the Inductors:
V IN
鈥?/div>
V OUT V
1.8V
OUT
12V
鈥?/div>
1.8V
-
L = ---------------------------------
脳
----------------- = -----------------------------------
脳
------------
f SW
V IN
200kHz
脳
8A 12V
-----------
脳 鈭咺
-
L
2
= 956nH
2
Power =
30.4
A
脳
0.15
脳
5m鈩?/div>
Power
=
0.69W per channel or 1.38W for both channels
Used two 10m鈩? 1W resistors in parallel.
J. R
L
Selection:
R
ni
脳
R
SENSE
12.5
脳
5m鈩?/div>
= ---------------------------------------- = ------------------------------------------------------- = 8.7k鈩?/div>
-
L
2.2mS
脳
1.63m鈩?/div>
脳
2
gm
脳
R
OUT
脳
2
gm Amplifier Gain = gm
脳
RL = 2.2mS
脳
8.7k = 19.1
13
FN9011.3

ISL6560CB 產(chǎn)品屬性

  • 48

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - DC DC 切換控制器

  • -

  • 電流模式

  • 1

  • 2MHz

  • 50%

  • 3 V ~ 12 V

  • 是

  • 無

  • 無

  • 無

  • 無

  • 無

  • 無

  • 無

  • 0°C ~ 70°C

  • 16-SOIC（0.154"，3.90mm 寬）

  • 管件

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