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参数资料
| 型号： | NCL30000LED3GEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 13/22页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL 17W 350MA NONDIM DVR |
| 设计资源： | NCL30000LED2GEVB Schematic NCL30000LED2GEVB Gerber Files NCL30000LED2GEVB Bill of Materials |
| 标准包装： | 1 |
| 电流 - 输出 / 通道： | 350mA |
| 输出及类型： | 1，隔离 |
| 输出电压： | 12 ~ 50 V |
| 输入电压： | 90 ~ 305VAC |
| 已供物品： | 板 |
| 已用 IC / 零件： | NCL30000 |
| 其它名称： | NCL30000LED3GEVB-ND NCL30000LED3GEVBOS |
NCL30000
V Control
COMP
MOSFET Conduction
Ct
V DD
I charge
V EAH
+
PWM
?
+
t on
I primary
Output Rectifier Conduction
0A
DRV
Ct (offset)
V Ct
V Ct(off)
V Control
V Control ? Ct (offset)
t on(max)
I secondary
0A
DRV
Figure 25. On Time Control
Off Time Sequence
In a fixed on-time CRM flyback converter, energy stored
in the primary of the flyback transformer varies directly with
input line voltage on a cycle-by-cycle basis. When the
switching cycle is terminated, the energy stored in the
transformer is transferred to the secondary. The auxiliary
DRV
V out
0V
winding used to provide bias to the NCL30000 is also used
to detect when the current in the secondary winding has
dropped to zero. This is illustrated in Figure 26.
V ZCD(WIND)
0V
V ZCD(WIND),off
0V
V ZCD(WIND),on
V CL(POS)
V ZCD(ARM)
V ZCD(TRIG)
V CL(NEG)
t on
t diode
0V
t off
t SW
Figure 26. Ideal CrM Waveforms with ZCD Winding
http://onsemi.com
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