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參數(shù)資料
| 型號(hào)： | CS5132HGDWR24 |
| 廠商： | MOTOROLA INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.5 A DUAL SWITCHING CONTROLLER, PDSO24 |
| 封裝： | 0.300 INCH, MS-013, SO-24 |
| 文件頁數(shù)： | 4/20頁 |
| 文件大?。?/td> | 181K |
| 代理商： | CS5132HGDWR24 |
than ±165mV. Repeating step 2a, we select four (4)
1200F/10V Sanyo GX output capacitors.
Step 3: Duty Cycle, Switching Frequency, TON & TOFF
Duty Cycle
≈ VOUT / VIN.
D = 2.0V / 5V = 40% for 2V output.
D = 3.3V / 5V = 66% for 3.3V output.
Select 200kHz Switching Frequency (FSW).
Step 3a: Calculate On-Time for 2V Output
TON =
=
= 2s
Calculate Off-Time:
TOFF =
= 5s - 2s = 3s.
Select the COFF1 capacitor in order to set the Off-Time:
COFF1 =
=
= 750pF.
A standard COFF1 capacitance value of 680pF can be used.
The 3980 factor is a characteristic of the CS5132H.
Step 3b: Calculate On-Time for 3.3V Output
TON =
=
= 3.3s
Calculate Off-Time:
TOFF =
- TON = 5s – 3.3s = 1.7s.
Select COFF2 to be 390pF.
Step 4: Output Inductor
The inductor should be selected based on its inductance,
current capability, and DC resistance. Increasing the induc-
tor value will decrease output voltage ripple, but degrade
transient response. There are many factors to consider in
selecting the inductor including: cost, efficiency, EMI and
ease of manufacture. The inductor must be able to handle
the peak current at the switching frequency without satu-
rating, and the copper resistance in the winding should be
kept as low as possible to minimize resistive power loss.
There are a variety of materials and types of magnetic
cores that could be used for this application. Among them
are: ferrites, molypermalloy cores (MPP), amorphous and
powdered iron cores. We will use a powdered iron core.
Iron powdered cores are very suitable due to their high sat-
uration flux density and have low loss at high frequencies,
a distributed gap and exhibit very low EMI.
Calculate Inductor Value:
L=
=
=1.2H.
Step 4a: Select 2% Ripple on 2V Output
VOUT = 2% × 2V = 40mV
The maximum allowable Inductor Ripple Current for a 2%
ripple on the 2V output is:
IL=
=
= 7.3A,
which corresponds to the following maximum Inductor
Peak and Valley currents:
IL(PEAK) = IOUT +
()=16A+()=19.6A,
IL(VALLEY) = IOUT -
()=16A-()=12.4A.
The selected 1.2H inductor yields the following ripple
current:
IL=
=
= 5A.
The maximum inductor peak current becomes:
IL(PEAK) = 16A +
= 16A + 2.5A = 18.5A.
The inductor valley current becomes:
IL(VALLEY) = 16A -
= 16A - 2.5A = 13.5A.
The above values are well within the maximum allowable
inductor peak and valley currents for a 2% output voltage
ripple.
Select Toroid Powdered Iron Core, low cost, low core loss-
es at 200kHz, low EMI.
Select XFMRS Inc, XF0016-VO4 1.2H inductor with RDC =
0.003 typical, 0.008 maximum.
Step 4b: Select 2% Ripple on 3.3V Output
Repeating Step 4a for the 3.3V output, we find 3.5H is a
suitable value for this output.
Step 5: Input Capacitors
These components must be selected and placed carefully to
yield optimal results. Capacitors should be chosen to pro-
vide acceptable ripple on the input supply lines. Key speci-
fications for input capacitors are their ripple rating.
Step 5a: VCC(CORE) Buck Regulator Input Capacitors
The input capacitor CIN should also be able to handle the
5A
2
5A
2
(5V - 2V)
× 0.4
200kHz
× 1.2H
(VIN - VOUT) × D
FSW × L
7.3A
2
IL
2
7.3A
2
IL
2
40mV
5.5m
VOUT
Total ESR
3V
× 6s
15A
(5V-2V)
× 6s
15A
(VIN - VOUT) tTR
I
1
FSW
0.66
200kHz
D
FSW
5s
× 0.6
3980
Period
× (1-D)
3980
- TON
1
FSW
0.40
200kHz
D
FSW
Application Information: continued
12
CS5132H
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