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参数资料
| 型号： | S-8328J25MC-F2F-T2 |
| 元件分类： | 稳压器 |
| 英文描述： | 0.3 A SWITCHING CONTROLLER, 287.5 kHz SWITCHING FREQ-MAX, PDSO5 |
| 封装： | PLASTIC, SOT-23, 5 PIN |
| 文件页数： | 9/65页 |
| 文件大小： | 759K |
| 代理商： | S-8328J25MC-F2F-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.
17
During tON, the energy is stored in L and is not transmitted to VOUT. When receiving output current (IOUT) from VOUT, the energy of the
capacitor (COUT) is consumed. As a result, the pin voltage of COUT is reduced, and goes to the lowest level after M1 is turned ON (tON).
When M1 is turned OFF, the energy stored in L is transmitted through the diode to COUT, and the voltage of COUT rises drastically. VOUT is
a time function that indicates the maximum value (ripple voltage: VP-P) when the current flowing through the diode into VOUT and load
current (IOUT) match.
Next, the ripple voltage is found out as follows:
IOUT vs t1 (time) from when M1 is turned OFF ( after tON) to when VOUT reaches the maximum level:
VOUT+VD-VIN
IOUT=IPK -
t1 ............................................. (8)
L
∴ t1=(IPK-IOUT)
......................................... (9)
VOUT+VD-VIN
After (tOFF), IL=0 (when the energy of the inductor is completely transmitted). Based on equation (7),
L
tOFF
=
....................................................(10)
VOUT+VD-VIN
IPK
When substituting equation (10) for equation (9),
IOUT
t1=tOFF -
tOFF
.................................................(11)
IPK
Electric charge
Q1 which is charged in COUT during t1:
VOUT+VD-VIN
Q1 = ∫
ILdt= IPK
∫
dt -
∫
tdt
L
VOUT+VD-VIN
1
= IPK
t1 - t1
2 .................................(12)
L
2
t1
0
t1
0
t1
0
When substituting equation (12) for equation (9):
1
IPK+IOUT
Q1=IPK - (IPK - IOUT) t1 =
t1 .....................(13)
2
A rise in voltage (VP-P) due to
Q1:
Q1
1
IPK+IOUT
VP-P =
=
t1 .......................(14)
COUT
2
When taking into consideration IOUT to be consumed during t1 and ESR (Equivalent Series Resistance) of COUT, namely RESR:
Q1
1
IPK+IOUT
IOUT t1
VP-P =
=
t1 +
RESR -
.........................(15)
COUT
2
COUT
When substituting equation (11) for equation (15):
(IPK-IOUT)
2
tOFF
IPK+IOUT
VP-P =
+
RESR ..................(16)
2IPK
COUT
2
Therefore to reduce the ripple voltage, it is important that the capacitor connected to the output pin has a large capacity and a small ESR.
DISCONTINUED
PRODUCT
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