參數(shù)資料
型號(hào)： S-8351A28MC-J2NT2G
元件分類： 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)： 11/50頁(yè)
文件大小： 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.
19
External Parts Selection
1. Inductor
To minimize the loss due to inductor direct current resistance, select an inductor with the smallest possible direct
current resistance (less than 1
). Set the inductance value (L value) to around 22 H to 1 mH.
To make the average value of the output voltage (VOUT) constant, it is necessary to supply the energy corresponding
to the output current (IOUT) from the inductor. The amount of charge required for IOUT is IOUT
× (tON + tOFF). Because
the inductor can supply energy only during tOFF, the charge is obtained by integrating equation (7) in the “3.
Operation
” in the “ Operation” with 0
→ tOFF, namely,
OFF
PK
t
2
I
. Thus,
)
t
(
I
t
2
I
OFF
ON
OUT
OFF
PK
+
×
=
(17)
OUT
OFF
ON
PK
I
t
2
I
+
=
∴
(18)
When the oscillation duty ratio of OSC is 75%, IPK = 8
IOUT. Therefore, an IPK current which is eight times IOUT flows
into transistor (M1).
The S-8351 Series includes a switching current controller which monitors the current flowing into the CONT pin by
the voltage (CONT control voltage) and controls the current. This controller prevents destruction of the IC due to
excess current.
If an inductor with a large L value is selected, both IPK and IOUT decrease. Since the energy stored in the inductor is
equal to
2
PK )
I
(
L
2
1
, the energy decreases because IPK decreases in steps of squares offsetting the increase of L
value. As a result, stepping up at a low voltage becomes difficult and the minimum operating input voltage becomes
high. However, the direct current resistance loss of L value and the M1 transistor decreases by the amount IPK
decreased, and the inductance efficiency improves.
On the other hand, if an inductor with a smaller L value is selected, both IPK and IOUT increase. Accordingly, the
minimum operating input voltage becomes low but the inductance efficiency deteriorates.
Caution An excessively large IPK may cause magnetic saturation for some core materials, leading to the
destruction of the IC. Use a core with material that satisfies Isat
*1 > IPK
*1.
Level of current that causes magnetic saturation.
2. Diode
Use an external diode that meets the following requirements :
Low forward voltage : VF
< 0.3 V
High switching speed : 500 ns max.
Reverse voltage :
VOUT
+ VF or more
Current rate :
IPK or more
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