参数资料
| 型号： | NCP1417DMR2 |
| 厂商： | ON Semiconductor |
| 文件页数： | 11/13页 |
| 文件大小： | 0K |
| 描述： | IC REG BST SYNC ADJ 0.2A 8MICRO |
| 产品变化通告： | Product Obsolescence 01/Apr/2004 |
| 标准包装： | 1 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.5 V ~ 5.5 V |
| 输入电压： | 1 V ~ 5.5 V |
| 频率 - 开关： | 600kHz |
| 电流 - 输出： | 200mA |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 包装： | 剪切带 (CT) |
| 供应商设备封装： | Micro8? |
| 其它名称： | NCP1417DMR2OSCT |
NCP1417
kept away from the feedback (FB, pin 1) terminal to avoid
unwanted injection of noise into the feedback path.
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.
Feedback of the output voltage must be a separate trace
detached from the power path. External feedback network
TYPICAL APPLICATION CIRCUIT
Input
1 V to
V OUT
C IN
10 μ F
L
22 μ H
308 K
R LB1
R FB2
200 K
C FB1
150 pF
R LB2
R FB1
355 K
1
2
3
4
NCP1417
FB OUT
LBI/SHDN LX
LB01 GND
REF LB02
8
7
6
5
33 μ F
C OUT
+
V OUT = 3.3 V/200 mA max.
Shutdown
330 K
Open Drain
Input
Low Battery
Open Drain
Output 1
56 nF
C SHDN
150 nF
C REF
Low Battery
Open Drain
Output 2
Figure 28. Typical Application Schematic for 2 Alkaline Cells Supply
RFB1 + RFB2
VOUT
VREF
RFB1 + 200 K 3.3 V * 1 + 355 K
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
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 [ 0.8 V LB1 = 1.84 V
V OUT ? RIPPLE = 40 mV P ? P at I OUT = 200 mA
Calculate the feedback network:
Select R FB2 = 200 K
* 1
1.19 V
performance out of the circuit.
http://onsemi.com
11
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