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參數(shù)資料
| 型號： | NCP1417 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | 200 mA DC-DC Step-up Converter with Dual Low Battery Protection |
| 中文描述： | 200毫安的DC - DC升壓轉(zhuǎn)換器，具有雙低電池保護 |
| 文件頁數(shù)： | 12/16頁 |
| 文件大小： | 128K |
| 代理商： | NCP1417 |
NCP1417
http://onsemi.com
12
With the feedback resistor divider, additional small
capacitor, C
FB1
in parallel with R
FB1
is required to ensure
stability. The value can be in between 68 nF to 220 nF, the
rule is to select the lowest capacitance to ensure stability.
Also a small capacitor, C
FB2
in parallel with R
FB2
may also
be needed to lower the feedback ripple hence improve
output ripple and regulation. In this example, only C
FB1
is
used and the value is 150 nF.
Calculate the Low Battery Detect divider:
V
LB1
= 2.3 V
Select R
LB2
= 330 K
RLB1
RLB2
VLB1
VREF
1
RLB1
330 K
2.3 V
1.19 V
1
308 K
Once the V
LB1
is set, the next low battery detection point,
V
LB2
will be fixed automatically.
Determine the Steady State Duty Ratio, D for typical V
IN
,
operation will be optimized around this point:
VOUT
VIN
1
1
D
D
1
VIN
VOUT
1
2.4 V
3.3 V
0.273
Determine the average inductor current, I
LAVG
at maximum
I
OUT
:
ILAVG
IOUT
1
D
200 mA
1
0.273
275 mA
Determine the peak inductor ripple current, I
RIPPLE–P
and
calculate the inductor value:
Assume I
RIPPLE–P
is 25% of I
LAVG
, the inductance of the
power inductor can be calculated as follows:
IRIPPLE–P
0.25
275 mA
68.8 mA
L
VIN
2IRIPPLE–P
tON
2.4 V
2(68.8 mA)
1.4 S
24.4 H
Standard value of 22 H is selected for initial trial.
Determine the output voltage ripple, V
OUT–RIPPLE
and
calculate the output capacitor value:
VOUT
RIPPLE
40 mVP–Pat IOUT
200 mA
COUT
IOUT
tON
VOUT–RIPPLE
IOUT
ESRCOUT
where tON
1.4 S and ESRCOUT
0.15
,
COUT
200 mA
1.4 S
40 mV
200 mA
0.15
28 F
From above calculation, you need at least 28 F in order
to achieve the specified ripple level at conditions stated.
Practically, a one level larger capacitor will be used to
accommodate factors not take into account in the
calculation. So a capacitor value of 33 F is selected as
initial trial.
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