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| 型号： | NCP1027P065G |
| 厂商： | ON Semiconductor |
| 文件页数： | 11/30页 |
| 文件大小： | 0K |
| 描述： | IC SWIT PWM PROG CM OVP HV 8DIP |
| 标准包装： | 1,000 |
| 输出隔离： | 隔离 |
| 频率范围： | 58.5kHz ~ 71.5kHz |
| 输入电压： | 7.9 V ~ 10 V |
| 输出电压： | 700V |
| 功率（瓦特）： | 25W |
| 工作温度： | 0°C ~ 125°C |
| 封装/外壳： | 8-DIP（0.300"，7.62mm），7 引线 |
| 供应商设备封装： | 8-PDIP |
| 包装： | 管件 |
| 其它名称： | NCP1027P065GOS |
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NCP1027
Startup Sequence
The NCP1027 includes a high-voltage startup circuitry,
directly deriving current from the bulk line to charge the
Vbulk
I1
RV CC
V CC capacitor. Figure 24 details the simplified internal
arrangement.
+
1
ICC1
IC1
←
5
I2
I clamp
-
+
+
CV CC
Vz = 8.7 V
V CCon
V CCoff
+
I clamp > 6 mA
→ OVP fault
8
Figure 24. Internal Arrangement of the Startup Circuitry
When the power supply is first connected to the mains
outlet, the internal current source is biased and charges up
the V CC capacitor. When the voltage on this V CC capacitor
reaches the VCC ON level (typically 8.5 V), the current
source turns off, reducing the amount of power being
dissipated. At this time, the V CC capacitor only supplies the
controller, and the auxiliary supply should take over before
V CC collapses below VCC (min) . This V CC capacitor, CV CC ,
must therefore be calculated to hold enough energy so that
V CC stays above VCC (min) (7.3 V typical) until the
auxiliary voltage fully takes over.
An auxiliary winding is needed to maintain the V CC in
order to self-supply the switcher. The V CC capacitor has
only a supply role and its value does not impact other
parameters such as fault duration or the frequency sweep
period for instance. As one can see in Figure 24, an internal
active Zener diode, protects the switcher against lethal V CC
runaways. This situation can occur if the feedback loop
optocoupler fails, for instance, and you would like to
protect the converter against an over voltage event. In that
case, the internal current increase incurred by the V CC
rapid growth triggers the over voltage protection (OVP)
circuit and immediately stops the output pulses for 440 ms.
Then a new startup attempt takes place to check whether
the fault has disappeared or not. The OVP paragraph gives
more design details on this particular section.
The V CC capacitor can be calculated knowing a) the
amount of energy that needs to be stored; b) the time it
takes for the auxiliary voltage to appear, and; c) the current
consumed by the controller at that time. For a better
understanding, Figure 25 shows how the voltage evolves
on the V CC capacitor upon startup.
http://onsemi.com
11
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