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AS1310 데이터시트(PDF) 16 Page - ams AG

부품명 AS1310
상세설명  Ultra Low Quiescent Current, Hysteretic DC-DC Step-Up Converter
PDF  30 Pages
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제조업체  AMSCO [ams AG]
홈페이지  http://www.ams.com
Logo AMSCO - ams AG

AS1310 데이터시트(HTML) 16 Page - ams AG

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Page 16
ams Datasheet
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[v1-11] 2015-Jan-28
AS1310 − Detailed Description
PREGION_B =
Total power delivered to the load is the sum of EQ 8 and EQ 9:
From EQ 3 (using nominal values) peak current is given by:
Substituting EQ 11 into EQ 10 and re-arranging:
0.9T incorporates a wait time TWAIT = 10% T
Output power in terms of regulated output voltage and load
resistance is:
Combining EQ 12 and EQ 13:
Symbol
η reflects total energy loss between input and output
and is approximately 0.8 for these calculations. Use EQ 14 to
plot duty cycle (TON/T) changes for various output loadings and
changes to VIN.
Input Capacitor Selection
The input capacitor supports the triangular current during the
ON-time of the power switch, and maintains a broadly constant
input voltage during this time. The capacitance value is
obtained from choosing a ripple voltage during the ON-time of
the power switch. Additionally, ripple voltage is generated by
the equivalent series resistance (ESR) of the capacitor. For worst
case, use maximum peak current values from the datasheet.
Using TON = 1μs, and IPEAK = 480mA, and VRIPPLE = 50mV, EQ 15
yields:
CIN = 9.6μF
Nearest preferred would be 10μF.
(EQ9)
0.5L I
PK
()
2
T
---------------------------
(EQ10)
P
TOTAL
V
IN
I
PK
2
--------
T
OFF
T
-------------
0.5L I
PK
()
2
T
---------------------------
+
=
(EQ11)
I
PK
T
ONVIN
L
---------------------
=
(EQ12)
P
TOTAL
V
2
INTON
2TL
----------------------- 0.9T
()
=
(EQ13)
P
OUT
V
2
OUT
R
LOAD
------------------
=
(EQ14)
V
2
OUT
R
LOAD
------------------
V
2
INTON
2TL
----------------------- 0.9T
()η
=
(EQ15)
C
IN
I
PEAKTON
V
RIPPLE
--------------------------
=
(EQ16)
ESR
PK
ESR
RIPPLE
PK
R
I
V
=
_
_



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