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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(hù) |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 128K |
| 代理商： | NCP1417 |
NCP1417
http://onsemi.com
11
kept away from the feedback (FB, pin 1) terminal to avoid
unwanted injection of noise into the feedback path.
Feedback Network
Feedback of the output voltage must be a separate trace
detached from the power path. External feedback network
must be placed very close to the feedback (FB, pin 1) pin and
sensing the output voltage directly at the anode of the output
capacitor.
TYPICAL APPLICATION CIRCUIT
Figure 28. Typical Application Schematic for 2 Alkaline Cells Supply
+
33
μ
F
C
OUT
8
7
6
5
1
2
3
4
Input
1 V to
V
OUT
Shutdown
Open Drain
Input
Low Battery
Open Drain
Output 1
308 K
R
LB1
R
FB2
200 K
C
FR1
150 pF
R
FB1
355 K
R
LB2
330 K
150 nF
C
REF
56 nF
C
SHDN
Low Battery
Open Drain
Output 2
V
OUT
= 3.3 V/200 mA max.
22
μ
H
L
10
μ
F
C
IN
NCP1417
LBI/SHDN
LX
LB01
GND
REF
LB02
FB
OUT
GENERAL DESIGN PROCEDURES
Switch mode converter design is considered as black
magic to most engineers, some complicate empirical
formulae are available for reference usage. Those formulae
are derived from the assumption that the key components,
i.e. power inductor and capacitors are available with no
tolerance. Practically, its not true, the result is not a matter
of how accurate the equations you are using to calculate the
component values, the outcome is still somehow away from
the optimum point. Following, is a simple method based on
the most basic first order equations to estimate the inductor
and capacitor values for NCP1417 operating in Continuous
Conduction Mode. The component value set can be used as
a starting point to fine tune the circuit operation. By all
means, detail bench testing is needed to get the best
performance out of the circuit.
Design Parameters:
V
IN
= 1.8 V to 3.0 V, Typical 2.4 V
V
OUT
= 3.3 V
I
OUT
= 150 mA (200 mA max)
V
LB1
= 2.3 V; V
LB2
V
OUT–RIPPLE
= 40 mV
P–P
at I
OUT
= 200 mA
0.8 V
LB1
= 1.84 V
Calculate the feedback network:
Select R
FB2
= 200 K
RFB1
RFB2
VOUT
VREF
1
RFB1
200 K
3.3 V
1.19 V
1
355 K
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