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参数资料
| 型号： | NCP1380BGEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 19/26页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL NCP1380B 19V QR CTLR |
| 设计资源： | NCP1380BGEVB Schematic NCP1380BGEVB Gerber Files NCP1380BGEVB BOM |
| 标准包装： | 1 |
| 系列： | * |
| 其它名称： | NCP1380BGEVBOS |
NCP1380
Figure 35. Time Out Case n 5 2: the 3 rd and 4 th Valley are Missing
VCO MODE OR FREQUENCY FOLDBACK
V FBth + 6.5 * (10 3)V FB
VCO operation occurs for FB voltage lower than 0.8 V
(FB decreasing), or lower than 1.4 V (FB increasing). This
corresponds to low output power.
During VCO operation, the peak current is fixed to 17.5%
of his maximum value and the frequency is variable and
expands as the output power decreases.
The frequency is set by the end of charge of the capacitor
connected to the C T pin. This capacitor is charged with a
constant current source and its voltage is compared to an
internal threshold (V FBth ) fixed by FB voltage (see
Figure 27). When this capacitor voltage reaches the
threshold, the capacitor is rapidly discharged down to 0 V
and a new period start. The internal threshold is inversely
proportional to FB voltage. The relationship between V FB
and V FBth is given by Equation 1.
(eq. 1)
When V FB is lower than 0.3 V, V CT is clamped to
V CT(MAX) which is typically 5.5 V. Figure 36 shows the
VCO mode at works.
Figure 36. In VCO Mode, as the Power Output Decreases, the Frequency Expands
http://onsemi.com
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