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| 型号： | S-8328B50MA-EXE-T2 |
| 元件分类： | 稳压器 |
| 英文描述： | 0.3 A SWITCHING CONTROLLER, 115 kHz SWITCHING FREQ-MAX, PDSO3 |
| 封装： | PLASTIC, SOT-23, 3 PIN |
| 文件页数： | 11/65页 |
| 文件大小： | 759K |
| 代理商： | S-8328B50MA-EXE-T2 |
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SMALL PACKAGE PWM/PFM CONTROL STEP-UP SWITCHING REGULATOR
Rev. 7.2-10
S-8324/8328 Series
Seiko Instruments Inc.
19
1. Inductor
An inductance has strong influence on max. output current IOUT and efficiency
η.
Figure 7 shows IOUT
η characteristics for inductance of S-8324 and S-8328.
Figure 7
The peak current IPK increases by decreasing L and IOUT is at max. value at L value.
Further decreasing L decreases IOUT due to the lack of the current driving capacity of the switching transistor.
The loss of IPK by the switching transistor decreases by increasing L and the efficiency becomes max. at L value.
Further increasing L decreases efficiency due to the loss of the DC resistance of the coil.
47 to 220
H inductor for S-8324 A/B/C/D/E and 22 to 100 H inductor for S-8328 A/B/C/D/E, 10 to 22H inductor for S-8324 H/J, and 4.7
to 10
H inductor for S-8328 H/J are recommended.
Choose a value for L by refering to the reference data because the maximum output current is due to the input voltage in an actual case.
Choose an inductor so that the peak current IPK does not exceed the allowable current.
Exceeding the allowable current of the inductor causes magnetic saturation, remarkable low efficiency and destruction of the IC chip due
to a large current.
The peak current IPK in uncontinuous mode is caluculated from the following formula:
IPK =
fosc: oscillation frequency
VD
0.4V
For instance, when you choose 100
H at fosc=50 kHz for L using the S-8324A 50MC at the following conditions, IPK is caluculated to 170
mA from the (17) formula.
Input voltage VIN=3 V
Output voltage VOUT=5 V
Load current IOUT=30 mA
The switching current limit circuit is not built into this IC chip.
IPK current must be 500 mA or less.
2 IOUT (VOUT+VD-VIN)
fOSC
L
(A)
(17)
S-8324 A/B/C/D/E
IOUT
D75C
η
IOUT
47
220
recommended range
L (
H)
VOUT=5.0V, VIN=3.0V
S-8328 A/B/C/D/E
IOUT
CD105
η
IOUT
22
100
L (
H)
VOUT=5.0V, VIN=3.0V
DISCONTINUED
PRODUCT
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