参数资料
型号: NCP3125CRAGEVB
厂商: ON Semiconductor
文件页数: 15/22页
文件大小: 0K
描述: BOARD EVALUATION NCP3125 CERAMIC
设计资源: NCP3125 Schematic
NCP3125CRAGEVB BOM
标准包装: 1
主要目的: DC/DC,步降
输出及类型: 1,非隔离
输出电压: 最低可调至 0.8V
电流 - 输出: 4A
输入电压: 4.5 ~ 13.2 V
稳压器拓扑结构: 降压
频率 - 开关: 350kHz
板类型: 完全填充
已供物品:
已用 IC / 零件: NCP3125
其它名称: NCP3125CRAGEVBOS
NCP3125
R 2 + R 1 @
V REF
V OUT * V REF
(eq. 39)
The compensation components for the Pseudo Type III
Transconductance Error Amplifier can be calculated using
the method described below. The method serves to provide
R 1 = Top resistor divider
R 2 = Bottom resistor divider
V OUT = Output voltage
V REF = Regulator reference voltage
The most frequently used output voltages and their
associated standard R 1 and R 2 values are listed in Table 5.
Table 5. OUTPUT VOLTAGE SETTINGS
V O (V) R 1 (k W ) R 2 (k W )
a good starting place for compensation of a power supply.
The values can be adjusted in real time using the
compensation tool comp calc, available for download at
ON Semiconductor ’s website.
The value of the feed through resistor should always be at
least 2X the value of R 2 to minimize error from feed through
noise. Using the 2X assumption, R F will be set to 20 k W and
the feed through capacitor can be calculated as shown
below:
0.8
1.2
1.5
1.8
2.5
3.3
5.0
1.0
4.99
10
12.7
21.5
31.6
52.3
Open
10
11.5
10.2
10
10
10
http://onsemi.com
15
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