參數(shù)資料
型號(hào)： S-8351A28MC-J2NT2G
元件分類(lèi)： 穩(wěn)壓器
英文描述： SWITCHING REGULATOR, 110 kHz SWITCHING FREQ-MAX, PDSO5
封裝： LEAD FREE, SOT-23, 5 PIN
文件頁(yè)數(shù)： 9/50頁(yè)
文件大?。?/td> 630K
代理商： S-8351A28MC-J2NT2G
STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER
Rev.2.4_00
S-8351/8352 Series
Seiko Instruments Inc.
17
3. Operation
The following are the basic equations [(1) through (7)] of the step-up switching regulator. (Refer to Figure 18.)
+
+
OSC
CL
CONT
M1
VIN
L
Di
OFF
/
ON
VOUT
Figure 18 Step-Up Switching Regulator Circuit for Basic Equation
Voltage at CONT pin at the moment M1 is turned ON (VA)
*1 :
VA = VS
*2
(1)
*1.
Current flowing through L (IL) is zero.
*2.
Non-saturated voltage of M1.
The change in IL over time :
L
V
L
V
dt
dI
S
IN
L
=
(2)
Integration of equation (2) (IL) :
t
L
V
I
S
IN
L
=
(3)
IL flows while M1 is ON (tON). The time of tON is determined by the oscillation frequency of OSC.
The peak current (IPK) after tON :
ON
S
IN
PK
t
L
V
I
=
(4)
The energy stored in L is represented by 1/2
L (IPK)
2.
When M1 is turned OFF (tOFF), the energy stored in L is emitted through a diode to the output capacitor.
Then, the reverse voltage (VL) is generated :
VL = (VOUT
+ VD
*1) VIN
(5)
*1.
Diode forward voltage
The voltage at CONT pin rises only by VOUT
+VD.
The change in the current (IL) flowing through the diode into VOUT during tOFF :
L
V
L
V
dt
dI
IN
D
OUT
L
+
=
(6)
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