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参数资料
| 型号： | NCP1028LEDGEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 16/29页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR NCP1028LEDG |
| 设计资源： | NCP1028LEDGEVB BOM CP1028LEDGEVB Gerber Files NCP1028LED EVB Schematic |
| 标准包装： | 1 |
| 电流 - 输出 / 通道： | 720mA |
| 输出及类型： | 1，隔离 |
| 输出电压： | 18V |
| 输入电压： | 90 ~ 265VAC |
| 已供物品： | 板 |
| 已用 IC / 零件： | NCP1028 |
| 其它名称： | NCP1028LEDGEVBOS |
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NCP1028
Fault Condition – Low Input Voltage
The NCP1028 includes a brown-out circuitry able to
protect the power supply in case of low input voltage
conditions. Figure 29 shows how internally the NCP1028
monitors the voltage image of the bulk capacitor. Below a
given level, the controller blocks the driving pulses, above
it, it authorizes them. The internal circuitry, depicted by
Figure 29a, offers a way to observe the high-voltage (HV)
rail. A resistive divider made of R upper and R lower , brings
a portion of the HV rail on pin 3. Below the turn-on level,
the 10 m A current source IBO is off. Therefore, the turn-on
level solely depends on the division ratio brought by the
resistive divider.
16.0
160
1
vin
2
vcmp
Vbulk = 100 V
Vbulk = 70 V
12.0
120
Vbulk
V DD
Rupper
IBO
ON/OFF
8.00
80.0
BO
+
-
BO
4.00
40.0
Rlower
+
0
0
21
VBO
20.0u
60.0u
100u
140u
180u
Time in Seconds
Figure 29a. The internal brown-out
Figure 29b. Simulation results for 100/70 ON/OFF levels.
configuration with an offset current source.
Figure 29.
To the contrary, when the internal BO signal is high, the IBO source is activated and creates an 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
IBO is On
V( ) ) + Vbulk1
Rlower
Rlower ) Rupper
(eq. 1)
V( ) ) + Vbulk2
Rlower
Rlower ) Rupper
) IBO
Rlower Rupper
Rlower ) Rupper
(eq. 2)
We can now extract R lower from Equation 1 and plug it into Equation 2, then solve for R upper :
Rupper + Rlower
Vbulk1-VBO
VBO
Rlower + VBO
Vbulk1-Vbulk2
IBO (Vbulk1-VBO)
If we decide to turn-on our converter for Vbulk1 equals 100 V and turn it off for Vbulk2 equals 70 V, then we obtain:
R upper = 3.0 M W
R lower = 18 k W
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