参数资料
| 型号： | NCP1417DMR2 |
| 厂商： | ON Semiconductor |
| 文件页数： | 12/13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
ILAVG + OUT + 200 mA + 275 mA
RLB1 + RLB2
VLB1
VREF
RLB1 + 330 K 2.3 V * 1 + 308 K
VOUT 1
VIN
1 * D
VIN tON 2.4 V 1.4 m S
L + + + 24.4 m H
COUT u
+ 28 m F
COUT u
+ 1 * 2.4 V + 0.273
VIN
D + 1 *
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 pF to 220 pF, 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 pF.
Calculate the Low Battery Detect divider:
V LB1 = 2.3 V
Select R LB2 = 330 K
* 1
1.19 V
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 3.3 V
Determine the average inductor current, I LAVG at maximum
I OUT :
I
1 * D 1 * 0.273
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
2IRIPPLE ? P 2(68.8 mA)
Standard value of 22 m H is selected for initial trial.
Determine the output voltage ripple, V OUT ? RIPPLE and
calculate the output capacitor value:
VOUT * RIPPLE + 40 mVP ? P at IOUT + 200 mA
IOUT tON
VOUT ? RIPPLE * IOUT ESRCOUT
where tON + 1.4 m S and ESRCOUT + 0.15 W ,
200 mA 1.4 m S
40 mV * 200 mA 0.15 W
From above calculation, you need at least 28 m 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 m F is selected as
initial trial.
http://onsemi.com
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