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参数资料
| 型号： | NCP1216AFORWGEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 12/18页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL NCP1216A 35W |
| 设计资源： | NCP1216AFORWGEVB Schematic NCP1216AFORWGEVB Gerber Files NCP1216AFORWGEVB Bill of Materials |
| 标准包装： | 1 |
| 系列： | * |
NCP1216, NCP1216A
300
Max Peak
Current
due to the DSS operation. In our example, at
T ambient = 50 ° C, I CC2 is measured to be 2.9 mA with a
10 A / 600 V MOSFET. As a result, the NCP1216 will
350 V
2.9 mA@TA + 50 C + 1 W
200
Skip Cycle
Current Limit
dissipate from a 250 VAC network,
°
(eq. 11)
P max + Jmax
+ 1W
T * TAmax
R q J * A
Vbulkmin * 50 V
Rdrop v
100
0
315.4U 882.7U 1.450M 2.017M 2.585M
Figure 23. The Skip Cycle Takes Place at Low Peak
Currents which Guarantees Noise Free Operation
Non ? Latching Shutdown
In some cases, it might be desirable to shut off the part
temporarily and authorize its restart once the default has
disappeared. This option can easily be accomplished
through a single NPN bipolar transistor wired between FB
and ground. By pulling FB below the Adj pin 1 level, the
output pulses are disabled as long as FB is pulled below
pin 1. As soon as FB is relaxed, the IC resumes its operation.
Figure 24 depicts the application example:
The PDIP ? 7 package offers a junction ? to ? ambient thermal
resistance R q J ? A of 100 ° C/W. Adding some copper area
around the PCB footprint will help decreasing this number:
12 mm x 12 mm to drop R q J ? A down to 75 ° C/W with 35 m
copper thickness (1 oz.) or 6.5 mm x 6.5 mm with 70 m
copper thickness (2 oz.). For a SOIC ? 8, the original
178 ° C/W will drop to 100 ° C/W with the same amount of
copper. With this later PDIP ? 7 number, we can compute the
maximum power dissipation that the package accepts at an
ambient of 50 ° C:
(eq. 12)
which barely matches our previous budget. Several
solutions exist to help improving the situation:
1. Insert a Resistor in Series with Pin 8: This resistor will
take a part of the heat normally dissipated by the NCP1216.
Calculations of this resistor imply that V pin8 does not drop
below 30 V in the lowest mains conditions. Therefore, R drop
can be selected with:
(eq. 13)
8 mA
ON/OFF
Q1
1
2
3
4
8
7
6
5
In our case, V bulk minimum is 120 VDC, which leads to a
dropping resistor of 8.7 k W . With the above example in
mind, the DSS will exhibit a duty ? cycle of:
2.9 mA 8 mA + 36% (eq. 14)
By inserting the 8.7 k W resistor, we drop
8.7 k W * 8 mA + 69.6 V
(eq. 15)
during the DSS activation. The power dissipated by the
Figure 24. Another Way of Shutting Down the IC
without a Definitive Latchoff State
NCP1216 is therefore:
Pinstant * DSSduty * cycle +
(350 * 69) * 8 m * 0.36 + 800 mW
(eq. 16)
A full latching shutdown, including overtemperature
We can pass the limit and the resistor will dissipate
protection, is described in application note AND8069/D.
1 W * 800 mW + 200 mW
(eq. 17)
(VHVDC * 11 V) ICC2
pdrop + 69
2
Power Dissipation
The NCP1216 is directly supplied from the DC rail
through the internal DSS circuitry. The current flowing
through the DSS is therefore the direct image of the
NCP1216 current consumption. The total power dissipation
can be evaluated using:
(eq. 10)
which is, as we saw, directly related to the MOSFET Q g . If
we operate the device on a 90 ? 250 VAC rail, the maximum
or
* 0.36 (eq. 18)
8.7 k
2. Select a MOSFET with a Lower Q g : Certain MOSFETs
exhibit different total gate charges depending on the
technology they use. Careful selection of this component
can help to significantly decrease the dissipated heat.
rectified voltage can go up to 350 VDC. However, as the
characterization curves show, the current consumption
drops at a higher junction temperature, which quickly occurs
http://onsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| NCP1216AP100 | 功能描述:开关变换器、稳压器与控制器 Current Mode PWM RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| NCP1216AP100G | 功能描述:电流型 PWM 控制器 Current Mode PWM w/50% Duty Cycle Max RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| NCP1216AP133 | 功能描述:电流型 PWM 控制器 Current Mode PWM RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| NCP1216AP133G | 功能描述:电流型 PWM 控制器 Current Mode PWM w/50% Duty Cycle Max RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| NCP1216AP65 | 功能描述:电流型 PWM 控制器 Current Mode PWM RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
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