参数资料
| 型号： | NCP5422ADR2 |
| 厂商： | ON Semiconductor |
| 文件页数： | 9/16页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM 16-SOIC |
| 产品变化通告： | Product Obsolescence 11/Feb/2009 |
| 标准包装： | 2,500 |
| PWM 型： | 电流/电压模式，V²? |
| 输出数： | 1 |
| 频率 - 最大： | 750kHz |
| 占空比： | 100% |
| 电源电压： | 10.8 V ~ 13.2 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | 0°C ~ 70°C |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 其它名称： | NCP5422ADR2OS |
NCP5422A
Selecting Feedback Divider Resistors
V OUT
R1
V FB
R2
Figure 7. Selecting Feedback Divider Resistors
Selection of Feedback Divider Resistors
Feedback divider resistors R1 and R2 are selected based
on a design trade-off between efficiency and output voltage
Figure 6. Hiccup Overcurrent Protection
Output Enable
On/Off control of the regulator outputs can be
implemented by pulling the COMP pins low. The COMP
accuracy. Both error amplifiers are referenced to 1.0 V, and
resistors R1 and R2 are connected from each channel's
output voltage to the inverting pin (V FB1(2) ) of each error
amplifier. To set the channel output voltage, first choose a
value for R1, and then R2 can be sized as follows:
Vout * 1
pins must be driven below the 0.425 V PWM comparator
offset voltage in order to disable the switching of the GATE
drivers.
R2 +
R1
1.0
The output voltage error due to the bias current of the error
Error + 1.6 · 10-6 · R1 · R2
VOUT ) VLFET ) VL
VIN ) VLFET * VHFET
DESIGN GUIDELINES
Definition of the design specifications
The output voltage tolerance can be affected by any or all
of the following reasons:
1.?buck regulator output voltage setpoint accuracy;
2.?output voltage change due to discharging or charging
of the bulk decoupling capacitors during a load
current transient;
3.?output voltage change due to the ESR and ESL of the
bulk and high frequency decoupling capacitors,
circuit traces, and vias;
4.?output voltage ripple and noise.
Budgeting the tolerance is left up to the designer who must
take into account all of the above effects and provide an
output voltage that will meet the specified tolerance at the
load.
The designer must also ensure that the regulator
component temperatures are kept within the manufacturer's
specified ratings at full load and maximum ambient
amplifier and the parallel combination of R1 and R2 can now
be estimated:
R1 ) R2
Reducing the size of R1 and R2 will reduce the output
voltage error, but increase the power dissipation.
Calculating Duty Cycle
The duty cycle of a buck converter (including parasitic
losses) is given by the formula:
Duty Cycle + D +
where:
V OUT = buck regulator output voltage;
V HFET = high side FET voltage drop due to R DS(ON) ;
V L = output inductor voltage drop due to inductor wire
DC resistance;
V IN = buck regulator input voltage;
V LFET = low side FET voltage drop due to R DS(ON) .
temperature.
http://onsemi.com
9
相关PDF资料 |
PDF描述 |
|---|---|
| NCP5424DR2G | IC REG CTRLR BUCK PWM 16-SOIC |
| NCP5425DB | IC REG CTRLR BUCK PWM VM 20TSSOP |
| NCP5501DT50RKG | IC REG LDO 5V .5A DPAK |
| NCP5666DS50R4G | IC REG LDO 5V 3A D2PAK-5 |
| NCP5667DS50R4G | IC REG LDO 5V 3A D2PAK-5 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| NCP5422ADR2G | 功能描述:DC/DC 开关控制器 Dual Out-Of-Phase Synchronous Buck RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| NCP5422EVB | 功能描述:电源管理IC开发工具 ANA SW REG EVAL BRD RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| NCP5423 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Dual Out−of−Phase Synchronous Buck Controller with Current Limit |
| NCP5423DR2G | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Dual Out−of−Phase Synchronous Buck Controller with Current Limit |
| NCP5424 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Dual Synchronous Buck Controller with Input Current Sharing |
发布紧急采购，3分钟左右您将得到回复。