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| 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： | 8/65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
S-8324/8328 Series
Rev. 7.2_10
16
Seiko Instruments Inc.
+
-
OSC
COUT
CONT
M1
VIN
L
VA
Di
ON/OFF
VOUT
Figure 5
The following are basic equations [(1) through (7)] of the step-up switching regulator (see Figure 5.)
Voltage at CONT pin the moment M1 is turned ON (current IL flowing through L is zero):
The change in IL over time:
dIL
VL
VIN - VS
= =
...................................................... (2)
d
L
Integration of the above equation (IL):
VIN - VS
IL =
t
.............................................................. (3)
L
IL flows while M1 is turned ON (tON). The time of tON is determined by the oscillation frequency of the OSC.
The peak current (IPK) after ton:
VIN - VS
IPK =
tON
.......................................................... (4)
L
The energy stored in L is represented with 1/2 L (IPK)
2.
When M1 is turned OFF (tOFF), the energy stored in L is transmitted through a diode to the output capacitor. Then reverse voltage (VL) is
generated.
VL= (VOUT+VD) - VIN..........................................................................(5)
(VD: Diode forward voltage)
The voltage at CONT pin rises only by the voltage corresponding to VOUT+VD.
The change in the current flowing through the diode into VOUT during tOFF:
dIL
VL
VOUT + VD - VIN
= =
.............................................. (6)
d
L
Integration of the above equation is as follows:
VOUT+VD-VIN
IL=IPK -
t
.................................................... (7)
L
VA=VS
................................................................................ (1)
(VS: Non-saturated voltage of M1)
DISCONTINUED
PRODUCT
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