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参数资料
| 型号： | NCP1230P65G |
| 厂商： | ON Semiconductor |
| 文件页数： | 18/21页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR PWM SMPS OVP OCP 7DIP |
| 标准包装： | 50 |
| 输出隔离： | 隔离 |
| 频率范围： | 65kHz |
| 输入电压： | 8.4 V ~ 18 V |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 8-DIP（0.300"，7.62mm），7 引线 |
| 供应商设备封装： | 7-PDIP |
| 包装： | 管件 |
NCP1230
Frequency Jittering
Frequency jittering is a method used to soften the EMI
signature by spreading out the average switching energy
around the controller operating switching frequency. The
NCP1230 offers a nominal ± 6.4% deviation of the nominal
switching frequency. The sweep sawtooth is internally
generated and modulates the clock up and down with a 5 ms
period. Figure 41 illustrates the NCP1230 behavior:
62.4 kHz
Internal Ramp
65 kHz
67.6 kHz
Internal Sawtooth
5 ms
Figure 41. An Internal Ramp is used to Introduce Frequency Jittering on the Oscillator Saw Tooth
Thermal Protection
An internal Thermal Shutdown is provided to protect the
integrated circuit in the event that the maximum junction
temperature is exceeded. When activated (165 ° C typically)
the controller turns off the PWM Drive Output. When this
occurs, Vcc will drop (the rate is dependent on the NCP1230
loading and the size of the Vcc capacitor) because the
controller is no longer delivering drive pulses to the
auxiliary winding charging up the Vcc capacitor. When Vcc
drops below 4.0 volts and the Vccreset circuit is activated,
the controller will restart. If the user is using a fixed bias
supply (the bias supply is provided from a source other than
from an auxiliary winding, refer to the typical application )
and Vcc is not allow to drop below 4.0 volts under a thermal
shutdown condition, the NCP1230 will not restart. This
feature is provided to prevent catastrophic failure from
accidentally overheating the device.
http://onsemi.com
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