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参数资料
| 型号： | NCP1217P100G |
| 厂商： | ON Semiconductor |
| 文件页数： | 12/19页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR PWM CM OVP HV 8DIP |
| 标准包装： | 50 |
| 输出隔离： | 隔离 |
| 频率范围： | 90kHz ~ 110kHz |
| 输入电压： | 8.3 V ~ 16 V |
| 工作温度： | 0°C ~ 125°C |
| 封装/外壳： | 8-DIP（0.300"，7.62mm），7 引线 |
| 供应商设备封装： | 7-PDIP |
| 包装： | 管件 |
| 其它名称： | NCP1217P100GOS |
NCP1217, NCP1217A
Duty Cycle Typ = 74%
2.9 V
0V
Latching Off the NCP1217
Total latched shutdown can easily be implemented
through a simple PNP bipolar transistor as depicted by
Figure 23. When OFF, Q1 is transparent to the operation.
When forward biased, the transistor pulls the Adj pin toward
+
--
L.E.B.
19 k
CS
Rcomp
V CC and permanently latches--off the IC as soon Vadj goes
above the latching level (typical 3.1 V). Figure 23 shows
how to wire the bipolar transistor to activate the latchoff. A
typical candidate for Q1 could be an MMBT3906 from
Rsense
From
Setpoint
Figure 22. Inserting a Resistor in Series with the Current
ON Semiconductor.
V CC
Sense Information Brings Ramp Compensation
In the NCP1217, the ramp features a swing of 2.9 V with
a duty cycle max at 74%. Over a 65 kHz frequency, for
instance, it corresponds to a 254 mV/ m s ramp. In our
FLYBACK design, let’s suppose that our primary
Off
Q1
Rlimit
inductance Lp is 350 m H, delivering 12 V with a Np:Ns ratio
of 1:0.1. The OFF time primary current slope is thus given
1
2
8
7
(Vout + Vf) ·
by:
= 371 mA ∕ m s or 37 mV ∕ m s when
Np
Ns
Lp
projected over an Rsense of 0.1 Ω , for instance. If we select
3
4
6
5
CV CC
75% of the downslope as the required amount of ramp
compensation, then we shall inject 27 mV/ m s. Our
internal compensation being of 254 mV/ m s, the divider
ratio ( divratio ) between Rcomp and the 19 k Ω is 0.106.
A few lines of algebra to determine Rcomp:
Figure 23. A Simple Bipolar Transistor Totally
Disables the IC
19 k · divratio
(1--divratio)
= 2.26 k Ω .
http://onsemi.com
12
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| NCP1217P133 | 功能描述:电流型 PWM 控制器 Enhanced Current RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| NCP1217P133G | 功能描述:电流型 PWM 控制器 Enhanced Current Mode PWM RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| NCP1217P65 | 功能描述:电流型 PWM 控制器 Enhanced Current RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| NCP1217P65G | 功能描述:电流型 PWM 控制器 Enhanced Current Mode PWM RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| NCP1218 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:PWM Controller with Adjustable Skip Level and External Latch Input |
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