- 您现在的位置：买卖IC网 > PDF目录19489 > NCP1201D100R2G (ON Semiconductor)IC CTRLR PWM CM OTP 8SOIC PDF资料下载
参数资料
| 型号： | NCP1201D100R2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 10/19页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR PWM CM OTP 8SOIC |
| 产品变化通告： | Product Obsolescence 01/Jul/2009 |
| 标准包装： | 1 |
| 输出隔离： | 隔离 |
| 频率范围： | 92kHz ~ 117kHz |
| 输入电压： | 12.5 V ~ 16 V |
| 输出电压： | 500V |
| 工作温度： | -40°C ~ 150°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOICN |
| 包装： | 剪切带 (CT) |
| 其它名称： | NCP1201D100R2GOSCT |
NCP1201
DETAILED OPERATING DESCRIPTION
Introduction
The NCP1201 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 criteria,
particularly in low--cost AC--DC adapters, auxiliary supplies
etc. Due to its high--performance High--Voltage technology,
the NCP1201 incorporates all the necessary components
normally needed in UC384X based supplies: timing
components, feedback devices, low--pass filter and
self--supply. This later point emphasizes the fact that
ON Semiconductor’s NCP1201 does NOT need an auxiliary
winding to operate: the device is self supplied from the
high--voltage rail and delivers a V CC to the IC. This system
is named the Dynamic Self--Supply (DSS).
Dynamic Self--Supply
The DSS principle is based on the charge/discharge of the
V CC bulk capacitor from a low level up to a higher level. We
can easily describe the current source operation following
simple logic equations:
POWER--ON: IF V CC < V CCOFF THEN
Current Source is ON, no output pulses
IF VCC decreasing > V CCON THEN
Current Source is OFF, output is pulsing
IF VCC increasing < V CCOFF THEN
Current Source is ON, output is pulsing
Typical values are: V CCOFF = 12.5 V, V CCON = 10.5 V
To better understand the operation principle, Figure 27
sketch offers the necessary explanation,
Vripple = 2 V
VCC OFF = 12.5 V
VCC ON = 10.5 V
ON
V CC
OFF
Current
Source
Output Pulses
10 mS
30 mS
50 mS
70 mS
90 mS
Figure 27. The Charge/Discharge Cycle Over a 10 m F V CC Capacitor
The DSS behavior actually depends on the internal IC
consumption and the MOSFET’s gate charge Qg. If we
select a MOSFET like the MTP2N60E, Qg max equals
22 nC. With a maximum switching frequency of 70 kHz for
the oscillator 60 kHz, the average power necessary to drive
the MOSFET (excluding the driver efficiency and
The total standby power consumption at no--load will
therefore heavily rely on the internal IC current
consumption plus the driving current (altered by the driver ’s
efficiency). Suppose that the IC is supplied from a 350 VDC
line. The current flowing through pin 8 is a direct image of
the NCP1201 current consumption (neglecting the
neglecting various voltage drops) is:
Pdriver = Fsw(max) × Qg × VCC
Where,
(eq. 1)
switching losses of the HV current source). If I CC2 equals
2.1 mA @ T A = 25 ? C, then the power dissipated (lost) by the
IC is simply: 350 V x 2.1 mA = 735 mW. For design and
reliability reasons, it would be interesting to reduce this
P driver = Average Power to drive the MOSFET
F sw(max) = Maximum switching frequency
Qg = MOSFET’s gate charge
V CC = VGS level applied to the gate of the MOSFET
To obtain an estimation of the driving current, simply
divide Pdriver by V CC ,
Idriver = Fsw(max) × Qg = 1.54 mA (eq. 2)
source of wasted power. In order to achieve that, different
methods can be used.
1. Use a MOSFET with lower gate charge Qg;
2. Connect pin through a diode (1N4007 typically) to
one of the mains input. The average value on pin 8
becomes:
VmainsPEAK × 2 (eq. 3)
π
http://onsemi.com
10
相关PDF资料 |
PDF描述 |
|---|---|
| RMC36DRAI | CONN EDGECARD 72POS R/A .100 SLD |
| VE-BWX-CW-B1 | CONVERTER MOD DC/DC 5.2V 100W |
| T491D227K006AT | CAP TANT 220UF 6.3V 10% 2917 |
| AYM24DTBH | CONN EDGECARD 48POS R/A .156 SLD |
| XC9572XL-7CSG48I | IC CPLD 72MCELL 7.5NS 48-CSBGA |
相关代理商/技术参数 |
参数描述 |
|---|---|
| NCP1201D60R2 | 功能描述:电流型 PWM 控制器 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 |
| NCP1201D60R2G | 功能描述:电流型 PWM 控制器 Current Mode PWM w/Fault Protection 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 |
| NCP1201P100 | 功能描述:电流型 PWM 控制器 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 |
| NCP1201P100G | 功能描述:电流型 PWM 控制器 Current Mode PWM w/Fault Protection 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 |
| NCP1201P60 | 功能描述:交流/直流开关转换器 Current Mode PWM 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 |
发布紧急采购，3分钟左右您将得到回复。