参数资料
| 型号： | NCP1200D60R2 |
| 厂商： | ON Semiconductor |
| 文件页数： | 7/16页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR PWM CM 8SOIC |
| 产品变化通告： | LTB Notification 03/Jan/2008 |
| 标准包装： | 1 |
| 输出隔离： | 隔离 |
| 频率范围： | 52kHz ~ 70kHz |
| 输入电压： | 11 V ~ 16 V |
| 工作温度： | -25°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： | 剪切带 (CT) |
| 其它名称： | NCP1200D60R2OSCT |
NCP1200
APPLICATIONS INFORMATION
INTRODUCTION
The NCP1200 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 High ? Voltage
technology, the NCP1200 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 NCP1200 does NOT need an auxiliary
winding to operate: the product is naturally supplied from
the high ? voltage rail and delivers a V CC to the IC. This
system is called the Dynamic Self ? Supply (DSS).
V CCOFF = 11.4 V
10.6 V Avg.
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 with a bunch
of simple logical equations:
POWER ? ON: IF V CC < V CCOFF THEN Current Source
is ON, no output pulses
IF V CC decreasing > V CCON THEN Current Source is
OFF, output is pulsing
IF V CC increasing < V CCOFF THEN Current Source is
ON, output is pulsing
Typical values are: V CCOFF = 11.4 V, V CCON = 9.8 V
To better understand the operational principle, Figure 15’s
sketch offers the necessary light:
V CC
V CCON = 9.8 V
ON
OFF
Current
Source
Output Pulses
10.00M
30.00M
50.00M
70.00M
90.00M
Figure 15. The Charge/Discharge Cycle
Over a 10 m F V CC Capacitor
Fsw @ Qg @ V cc
2 * Vmains PEAK
becomes . Our power contribution
The DSS behavior actually depends on the internal IC
consumption and the MOSFET’s gate charge, Qg. If we
select a MOSFET like the MTD1N60E, Qg equals 11 nC
(max). With a maximum switching frequency of 48 kHz (for
the P40 version), the average power necessary to drive the
MOSFET (excluding the driver efficiency and neglecting
various voltage drops) is:
with
Fsw = maximum switching frequency
Qg = MOSFET’s gate charge
V CC = V GS level applied to the gate
. 0.16 = 256 mW. If for design reasons this contribution is
still too high, several solutions exist to diminish it:
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
p
example drops to: 160 mW.
Dstart
1N4007
1 HV 8
To obtain the final driver contribution to the IC
consumption, simply divide this result by V CC : Idriver =
Fsw @ Qg = 530 m A. The total standby power consumption
at no ? load will therefore heavily rely on the internal IC
consumption plus the above driving current (altered by the
driver ’s efficiency). Suppose that the IC is supplied from a
400 V DC line. To fully supply the integrated circuit, let’s
EMI
Filter
C3
4.7 m F
400 V
+
NCP1200
Adj
2 FB NC 7
3 CS V CC 6
4 GND Drv 5
imagine the 4 mA source is ON during 8 ms and OFF during
50 ms. The IC power contribution is therefore: 400 V . 4 mA
Figure 16. A simple diode naturally reduces the
average voltage on pin 8
http://onsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| NCP1200D60R2G | 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 |
| NCP1200D60R2G-CUT TAPE | 制造商:ON 功能描述:NCP1200 Series 16 V 70 kHz Surface Mount PWM Current-Mode Controller - SOIC-8 |
| NCP1200P100 | 功能描述:电流型 PWM 控制器 100KHz 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 |
| NCP1200P100G | 功能描述:电流型 PWM 控制器 100KHz 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 |
| NCP1200P100G | 制造商:ON Semiconductor 功能描述:Pulse Width Modulation (PWM) Controller |
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