参数资料
| 型号： | NCP5212AMNTXG |
| 厂商： | ON Semiconductor |
| 文件页数： | 15/19页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM 16-QFN |
| 标准包装： | 1 |
| PWM 型： | 电流/电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 330kHz |
| 电源电压： | 4.5 V ~ 27 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： | -40°C ~ 85°C |
| 封装/外壳： | 16-VQFN 裸露焊盘 |
| 包装： | 标准包装 |
| 其它名称： | NCP5212AMNTXGOSDKR |
NCP5212A, NCP5212T
V o * (V IN * V o )
I pk + I OCP_DC )
programming stage at system start up. This is used to sense
the voltage level which is developed by a resistor Rocp so as
to program the overcurrent detection threshold voltage. For
typical application, the V octh is set as default value(40 mV
typ) by setting Rocp = 0 W , or directly short the IDRP/OCP
pin to ground. It has the benefit of saving one component at
application board. For other programming values of V octh ,
please refer to the electrical table of “Overcurrent Protection
Setting” section.
Guidelines for selecting OCP Trip Component
1. Choose the value of Rocp for V octh selection.
2. Define the DC value of OCP trip point(I OCP_DC )
that you want. The typical value is 1.5 to 1.8 times
of maximum loading current. For example, if
maximum loading is 10 A, then set OCP trip point
at 15 A to 18 A.
3. Calculate the inductor peak current (I pk )which is
estimated by the equation:
(eq. 4)
2 * V IN * f SW * L o
4. Check with inductor datasheet to find out the value
of inductor DC resistance DCR, then calculate the
RS1, RS2 dividing factor k based on the equation:
V octh
k + (eq. 5)
I pk * DCR
5. Select C S value between 100 nF to 200 nF.
Typically, 100 nF will be used.
6. Calculate Rs1 value by the equation:
resets or power recycle the device can exit the fault. The
following diagram shows the typical waveform when OVP
event occurs.
Top to Bottom : SWN, DL, Vo, PGOOD
Figure 25. Overvoltage Protection
Undervoltage Protection (UVP)
An UVP circuit monitors the V FB voltage to detect under
voltage event. The under voltage limit is 80% (typical) of the
nominal V FB voltage. If the V FB voltage is below this
threshold over consecutive 8 clock cycles, an UV fault is set
and the device is latched off such that both top and bottom
gate drives are off. EN resets or power recycle the device can
exit the fault.
Rs1 +
L
k * DCR * Cs
(eq. 6)
7. Calculate Rs2 value by the equation:
Rs2 +
k * Rs1
1 * k
(eq. 7)
8. Hence, all the current sense components Rs1, Rs2,
Cs had been found for taget I OCP_DC .
9. If Rs2 is not used (open), set k = 1, at that
moment, the I pk will be restricted by:
I pk +
V octh
DCR
(eq. 8)
Top to Bottom : SWN, Vo, PGOOD
Overvoltage Protection (OVP)
When V FB voltage is above OVPth+ of the nominal V FB
voltage for over 1.5 m s blanking time, an OV fault is set. At
that moment, the top gate drive is turned off and the bottom
gate drive is turned on until the V FB below lower under
voltage (UV) threshold and bottom gate drive is turned on
again whenever V FB goes above upper UV threshold. EN
Figure 26. Undervoltage Protection
Thermal Shutdown
The IC will shutdown if the die temperature exceeds
150 ° C. The IC restarts operation only after the junction
temperature drops below 125 ° C.
http://onsemi.com
15
相关PDF资料 |
PDF描述 |
|---|---|
| NCP5214AMNR2G | IC CTLR NOTEBOOK DDR PWR 22-DFN |
| NCP5214MNR2G | IC CTLR NOTEBOOK DDR PWR 22-DFN |
| NCP5215MNR2G | IC CTLR SYNC BUCK DUAL 40-QFN |
| NCP5217AMNTXG | IC REG CTRLR BUCK PWM 14-QFN |
| NCP5218MNR2G | IC DDR PWR CTLR 2IN2 NTBK 22-DFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| NCP5212T | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Single Synchronous Step-Down Controller |
| NCP5212TMNTXG | 功能描述:DC/DC 开关控制器 SYNC STEP DOWN CONTROLLER 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 |
| NCP5214 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:2-in-1 Notebook DDR Power Controller |
| NCP5214A | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:2−in−1 Notebook DDR Power Controller |
| NCP5214AMNR2G | 功能描述:DC/DC 开关控制器 OSPI 2 IN 1 NTEBOOK 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 |
发布紧急采购，3分钟左右您将得到回复。