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参数资料
| 型号： | NCP1280DR2 |
| 厂商： | ON Semiconductor |
| 文件页数： | 12/17页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR PWM PROG OVP HV 16SOIC |
| 标准包装： | 2,500 |
| 输出隔离： | 隔离 |
| 频率范围： | 140kHz ~ 320kHz |
| 输入电压： | 7 V ~ 25 V |
| 工作温度： | -40°C ~ 150°C |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SOIC N |
| 包装： | 带卷 (TR) |
NCP1280
V in
I START
V AUX
I START
To auxiliary supply
Line Under/Overvoltage Shutdown
The NCP1280 incorporates line undervoltage and
I AUX
C AUX
I supply
overvoltage shutdown (UV/OV) circuits. The under voltage
(UV) threshold is 1.52 V and the overvoltage threshold
Disable
Figure 29. Recommended V AUX Configuration
Power to the controller while operating in the self ? bias or
DSS mode is provided by C AUX . Therefore, C AUX must be
sized such that a V AUX voltage greater than 7 V is
maintained while the outputs are switching and the
converter reaches regulation. Also, the V AUX discharge time
(from 11 V to 7 V) must be greater that the soft ? start charge
period to assure the converter turns ON.
The startup circuit is rated at a maximum voltage of 700 V.
If the device operates in the DSS mode, power dissipation
should be controlled to avoid exceeding the maximum
power dissipation of the controller.
V AUX(on)
V AUX
V AUX(off)
0V
V OV
UV/OV Voltage
V UV
0V
(OV) is 3.61 V, for a ratio of 1:2.4. If the input voltage range
exceeds the pre ? set OV threshold, the OV function can be
disabled by connecting a Zener from this pin to ground. The
Zener voltage should be less than 3.6 V.
The UV/OV circuit can be biased using an external
resistor divider from the input line. The resistor divider must
be sized to enable the controller once V in is within the
required operating range. If the UV or OV threshold is
reached, the soft ? start capacitor is discharged, and the
outputs are immediately disabled with no overlap delay as
shown in Figure 30. Also, if an UV condition is detected, the
5.0 V Reference Supply is disabled.
UV or OV Fault
Propagation delay to
outputs (t UV or t OV )
OUT2
0V
OUT1
0V
Figure 30. UV/OV Fault Timing Diagram
Once the UV or OV condition is removed and V AUX
reaches 11 V, the controller initiates a soft ? start cycle.
Figure 31 shows the relationship between the UV/OV
The UV/OV pin can also be used to implement a remote
enable/disable function. Biasing the UV/OV pin below its
UV threshold disables the converter.
voltage, the outputs and the soft ? start voltage.
http://onsemi.com
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