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参数资料
| 型号： | NCP1397BDR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 14/27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
This techniques allows us to detect a fault on the converter
in case the FB pin cannot rise above 0.3 V (to actually close
the loop) in less than a duration imposed by the
programmable timer. Please refer to the fault section for
detailed operation of this mode.
As shown on Figure 26, the internal dynamics of the VCO
control voltage will be constrained between 0.5 V and 2.3 V,
whereas the feedback loop will drive Pin 6 (FB) between
1.1 V and 5.3 V. If we take the default FB pin excursion
numbers, 1.1 V = 50 kHz, 5.3 V = 500 kHz, then the VCO
maximum slope will be:
500 k * 50 k
4.2
+ 107 kHz/V
Figures 27 and 28 portray the frequency evolution
depending on the feedback pin voltage level in a different
frequency clamp combination.
Figure 28. Here a different minimum frequency was
programmed as well as a maximum frequency
excursion
Please note that the previous small ? signal VCO slope has
now been reduced to 300k / 4.1 = 71 kHz / V on M upper and
M lower outputs. This offers a mean to magnify the feedback
excursion on systems where the load range does not generate
a wide switching frequency excursion. Due to this option,
we will see how it becomes possible to observe the feedback
level and implement skip cycle at light loads. It is important
to note that the frequency evolution does not have a real
linear relationship with the feedback voltage. This is due to
the deadtime presence which stays constant as the switching
period changes.
The selection of the three setting resistors (F max , F min and
deadtime) requires the usage of the selection charts
displayed below:
Figure 27. Maximal Default Excursion,
Rt = 41 k W on Pin 4 and R F(max) = 1.9 k W on Pin 2
550
450
350
250
150
V CC = 15 V
V FB = 6.5 V
DT = 300 ns
F min = 200 kHz
F min = 50 kHz
50
1.9
11.9
21.9
31.9
41.9
R Fmax (k W )
Figure 29. Maximum Switching Frequency Resistor
Selection Depending on the Adopted Minimum
Switching Frequency
http://onsemi.com
14
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| NCP1398BDR2G | 功能描述:功率驱动器IC HI-PERF RES MODE CTR W/ H RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| NCP1398CDR2G | 制造商:ON Semiconductor 功能描述:HI-PERF RES MODE CTR W/ H - Tape and Reel 制造商:ON Semiconductor 功能描述:REEL / HI-PERF RES MODE CTR W/ H |
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