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| 型号： | NCP1910A65DWR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 26/37页 |
| 文件大小： | 0K |
| 描述： | IC COMBO CTLR ATX 24-SOIC |
| 标准包装： | 1 |
| 模式： | 连续导电（CCM） |
| 频率 - 开关： | 245 kHz |
| 电流 - 启动： | 100µA |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SOIC（0.295"，7.50mm 宽）23 引线 |
| 供应商设备封装： | 24-SOIC W |
| 包装： | 标准包装 |
| 其它名称： | NCP1910A65DWR2GOSDKR |
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NCP1910
PFC Frequency Foldback
NCP1910 implements frequency foldback feature on PFC
section to improve the efficiency at light load. Thanks to
V in2 feed ? forward feature, the output power is proportional
to the (V CTRL ? V CTRL(min) ). The PFC frequency foldback
Vref
is hence done by comparing (V CTRL ? V CTRL(min) ) with
V fold , the voltage on Fold pin.
The simplified block diagram of PFC frequency foldback
feature is depicted in Figure 50.
PFCOSC
Vdd
Vfold
Vfold(max)
Ict(fold)
Ict
Ict(min)
“0” / ”1”
V PREF / 10%V PREF
Oscillator section
Vctrl
Grand Reset
Vctrl(min)
S
PFC BO
Q
Q
R
PFC OK
Figure 50. The PFC Frequency Foldback Block
Where:
? I Ct(min) limits the minimum operating frequency.
? I Ct and I Ct(min) provide the charging current for
oscillator and hence control the nominal operating
frequency.
? V fold determines the power level at which the
frequency foldback starts.
? I Ct(fold) steals the I Ct and hence reduces the
operating frequency according to the error
information between V fold and (V CTRL ?
V CTRL(min) ).
F sw(fold)
? The transient slope of frequency foldback vs. V CTRL
is fixed inside.
? V fold(max) is to limit the maximum power level of
frequency foldback, which is around 2 V typically.
The frequency foldback is disabled at startup, i.e. before
the PFCok signal in Figure 50 is asserted high.
The user can adjust the power level at which the frequency
foldback starts by adjust the resistor divider between V REF
pin and fold pin. Also, the frequency foldback can be
disabled by grounding fold pin.
The relationship between operating frequency and V CTRL
is depicted in Figure 51.
F sw
The slope is fixed internally.
The power level at which fre-
quency starts reducing is ad-
justable by modifying V fold .
V fold – 0.4
V fold
V CTRL ? V CTRL(min) T Power
Figure 51. The Relationship between Frequency and V CTRL
http://onsemi.com
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| NCP1910B65DWR2G | 功能描述:交流/直流开关转换器 GREENM COMBO 2GND N/SKIP RoHS:否 制造商:STMicroelectronics 输出电压:800 V 输入/电源电压（最大值）:23.5 V 输入/电源电压（最小值）:11.5 V 开关频率:115 kHz 电源电流:1.6 mA 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:SSO-10 封装:Reel |
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| NCP1927DR2G | 功能描述:功率因数校正 IC PFC AND FLYBACK CONTROLER RoHS:否 制造商:Fairchild Semiconductor 开关频率:300 KHz 最大功率耗散: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
| NCP1937A1DR2G | 制造商:ON Semiconductor 功能描述:COMBO PFC & QUAZI FLYBACK - Tape and Reel 制造商:ON Semiconductor 功能描述:REEL / COMBO PFC & QUAZI FLYBACK |
| NCP1937B1DR2G | 制造商:ON Semiconductor 功能描述:COMBO PFC & QUAZI FLYBACK - Tape and Reel |
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