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參數(shù)資料
| 型號(hào)： | SC1409ISTR |
| 廠商： | Semtech Corporation |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Isolated Flyback Switching Regulator with 9V Output |
| 中文描述： | 隔離反激式開(kāi)關(guān)穩(wěn)壓9V輸出 |
| 文件頁(yè)數(shù)： | 7/8頁(yè) |
| 文件大?。?/td> | 109K |
| 代理商： | SC1409ISTR |
SC1409
2000 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
1 A Synchronous Switching Regulator
June 28, 2000
7
COMPONENT SELECTION
Input Capacitor
The Input capacitor(s) must be capable of 0.5A RMS
ripple current. Total capacitance values of 22uF to
47uF are suitable with Esr of less than 350m
. Typical
capacitors would be AVX TPS Tantalum surface
mount type TPSC476M010R350 or Panasonic Spe-
cialty Polymer Aluminum Electrolytic surface mount
type ECGC0KB470RA. Other types of capacitor are
also suitable, such as high value ceramic or Aluminum
electrolytics.
Inductor
Suitable Inductor values are in the range of 47uH to
330uH, higher inductor values give lower output volt-
age ripple and slower transient response time. Inductor
ripple current acts with the output capacitor ESR to
produce output voltage ripple. For a given output volt-
age ripple requirement, L can be calculated from
Output Capacitor
The output capacitor requirements are similar to the
input capacitor except ripple current is lower. Similar
capacitors will be suitable.
Soft Start Capacitor
The soft start capacitor value determines the soft start
time according to the following equation:-
C = 0.015t
where C is the soft start capacitor value in uF
and t is the soft start time in mS
Startup from a shutdown condition will take longer than
this since the soft start capacitor must charge from its
shutdown value to approximately 1V at a charge cur-
rent of 1uA before the shutdown is released and true
soft start begins.
Divider Resistors
The current through the divider chain should be at least
1000 times higher than the FB input bias current to
eliminate ratio errors. This gives a maximum value for
the bottom divider resistor (R4) of 24k
The top resistor (R2) can then be determined from
R2 = (Vo-1.203)
·
R4/1.203
Compensation
Normally, external compensation is not recommended,
however, if required, loop response can be tailored
with suitable values for R3, R5, C4 and C5. Consult the
factory for details.
C5
OPEN
R3
OPEN
Place C6 across pins 7 and 5
U1
SC1409IS
8
1
2
3
4
5
6
7
ISET
SYNC/FSET
EN/SS
AGND
FB
PGND
PHASE
VIN
R2
1.74k*
GND
5V in
R4
1.0k
+
C1
47uF
C6
0.1uF
C3
0.033uF
C4
OPEN
+
C2
47uF
R5
OPEN
R1
OPEN
3.3V Out
L1
100uH
Coilcraft
DO3316P-104
Typical Application Circuit
(
)
IN
RIPPLE
V
OUT
OUT
IN
V
f
V
ESR
V
V
L
≥
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