参数资料
| 型号： | NCP1397ADR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 19/27页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR ISO PWM 16-SOIC |
| 标准包装： | 2,500 |
| PWM 型： | 控制器 |
| 输出数： | 1 |
| 频率 - 最大： | 560kHz |
| 占空比： | 52% |
| 电源电压： | 10.3 V ~ 20 V |
| 降压： | 无 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽）15 引线 |
| 包装： | 带卷 (TR) |
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NCP1397A, NCP1397B
450
350
250
150
50
16.0
12.0
8.0
4.0
0
Vin
351 V
BO
250 V
20 m
60 m
100 m
140 m
180 m
time in seconds
Figure 41. Simulation Results for 350 / 250 ON / OFF Levels
R lower
V( ) ) + V bulk1
V( ) ) + V bulk2
R upper + R lower
To the contrary, when the internal BO signal is high
(M lower and M upper pulse), the IBO source is activated and
creates a hysteresis. As a result, it becomes possible to select
the turn ? on and turn ? off levels via a few lines of algebra:
IBO is off
(eq. 1)
R lower ) R upper
IBO is on
R lower
R lower ) R upper
(eq. 2)
R lower R upper
) IBO
R lower ) R upper
We can now extract R lower from Equation 1 and plug it into
Equation 2, then solve for Rupper:
V bulk1 * VBO
VBO
V bulk1 * V bulk2
R lowerer + VBO
IBO V bulk1 * VBO
If we decide to turn ? on our converter for Vbulk1 equals
350 V and turn it off for V bulk2 equals 250 V, then we obtain:
R upper = 3.57 M W
R lower = 10.64 k W
The bridge power dissipation is 400 2 / 3.781 M W =
45 mW when front ? end PFC stage delivers 400 V.
Figure 41 simulation result confirms our calculations.
Latchoff Protection
There are some situations where the converter shall be
fully turned ? off and stay latched. This can happen in
presence of an overvoltage (the feedback loop is drifting) or
when an over temperature is detected. Thanks to the addition
of a comparator on the BO pin, a simple external circuit can
lift up this pin above V latch (4 V typical) and permanently
disable pulses. The V CC needs to be cycled down below
6.5 V typically to reset the controller.
http://onsemi.com
19
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相关代理商/技术参数 |
参数描述 |
|---|---|
| NCP1397B | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:High Performance Resonant Mode Controller with Integrated High-Voltage Drivers |
| NCP1397BDR2G | 功能描述:电流型 PWM 控制器 NCP1397B 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 |
| NCP1397DR2G | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:High Performance Resonant Mode Controller with Integrated High-Voltage Drivers |
| NCP1398_13 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:High Performance Resonant Mode Controller with Integrated High-Voltage Drivers |
| NCP1398B | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:High Performance Resonant Mode Controller with Integrated High-Voltage Drivers |
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