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参数资料
| 型号： | NCP1203D100R2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 7/15页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR PWM CM UVLO HV 8SOIC |
| 标准包装： | 1 |
| 系列： | SMARTMOS™ |
| 输出隔离： | 隔离 |
| 频率范围： | 90kHz ~ 115kHz |
| 输入电压： | 8.4 V ~ 16 V |
| 输出电压： | 500V |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOICN |
| 包装： | 标准包装 |
| 其它名称： | NCP1203D100R2GOSDKR |
NCP1203
APPLICATION INFORMATION
Introduction
The NCP1203 implements a standard current mode
architecture where the switch ? off time is dictated by the
peak current setpoint. This component represents the ideal
candidate where low part ? count is the key parameter,
particularly in low ? cost AC ? DC adapters, auxiliary
supplies etc. Due to its high ? performance SMARTMOS
High ? Voltage technology, the NCP1203 incorporates all the
necessary components normally needed in UC384X based
supplies: timing components, feedback devices, low ? pass
filter and startup device. This later point emphasizes the fact
that ON Semiconductor ’s NCP1203 does not need an
external startup resistance but supplies the startup current
directly from the high ? voltage rail. On the other hand, more
and more applications are requiring low no ? load standby
power, e.g. for AC ? DC adapters, VCRs etc. UC384X series
have a lot of difficulty to reduce the switching losses at low
power levels. NCP1203 elegantly solves this problem by
skipping unwanted switching cycles at a user ? adjustable
power level. By ensuring that skip cycles take place at low
peak current, the device ensures quiet, noise free operation.
Finally, an auto ? recovery output short ? circuit protection
(OCP) prevents from any lethal thermal runaway in
overload conditions.
Startup Sequence
When the power supply is first powered from the mains
outlet, the internal current source (typically 6.0 mA) is
biased and charges up the V CC capacitor. When the voltage
on this V CC capacitor reaches the V CC(on) level (typically
12.8 V), the current source turns off and no longer wastes
any power. At this time, the V CC capacitor only supplies the
controller and the auxiliary supply is supposed to take over
before V CC collapses below V CC(min) . Figure 13 shows the
internal arrangement of this structure:
8
HV
12.8 V/4.9 V
+
-
6 mA or 0
6
CV CC
Aux
4
Figure 13. The Current Source Brings V CC Above 12.8 V and then Turns Off
Once the power supply has started, the V CC shall be
constrained below 16 V, which is the maximum rating on
13.5
pin 6. Figure 14 portrays a typical startup sequence with a
V CC regulated at 12.5 V:
12.5
12.8 V
REGULATION
11.5
10.5
9.5
3.00 M
8.00 M
13.0 M
18.0 M
23.0 M
t, TIME (sec)
Figure 14. A Typical Startup Sequence for
the NCP1203
http://onsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| NCP1203D100R2G | 制造商:ON Semiconductor 功能描述:Power Supply IC |
| NCP1203D40R2 | 功能描述:交流/直流开关转换器 40KHz Current Mode 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 |
| NCP1203D40R2G | 功能描述:电流型 PWM 控制器 40KHz Current Mode SMPS 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 |
| NCP1203D60R2 | 功能描述:电流型 PWM 控制器 60KHz Current Mode 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 |
| NCP1203D60R2G | 功能描述:电流型 PWM 控制器 60KHz Current Mode SMPS 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 |
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