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| 型号： | NCP1203D100R2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 9/15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
12.8 V
7.8 V
V CC
4.9 V
DRIVING PULSES
Figure 15. Typical Waveforms in Short Circuit Conditions
1 · Lp · Ip2 · Fsw + 3.8 W
Calculating the V CC Capacitor
The V CC capacitor can be calculated knowing the IC
consumption as soon as V CC reaches 12.8 V. Suppose that a
NCP1203P60 is used and drives a MOSFET with a 30 nC
total gate charge (Qg). The total average current is thus made
of ICC1 (700 m A) plus the driver current, Fsw x Qg or
1.8 mA. The total current is therefore 2.5 mA. The D V
available to fully startup the circuit (e.g. never reach the
7.8 V UVLO during power on) is 12.8–7.8 = 5 V. We have
a capacitor who then needs to supply the NCP1203 with
2.5 mA during a given time until the auxiliary supply takes
over. Suppose that this time was measured at around 15 ms.
The theoretical power transfer is therefore:
2
If this IC enters skip cycle mode with a bunch length of
10 ms over a recurrent period of 100 ms, then the total power
transfer is: 3.8 . 0.1 + 380 mW .
To better understand how this skip cycle mode takes place,
a look at the operation mode versus the FB level
immediately gives the necessary insight:
FB
CV CC is calculated using the equation
C +
C w 7.5 m F . Select a 22 m F/16 V and this will fit.
D t · i or
D V
NORMAL CURRENT
MODE OPERATION
4.2 V, FB Pin Open
3.2 V, Upper
Dynamic Range
Skipping Cycle Mode
The NCP1203 automatically skips switching cycles when
the output power demand drops below a given level. This is
accomplished by monitoring the FB pin. In normal
SKIP CYCLE OPERATION
I P(min) = 333 mV/R SENSE
1V
operation, pin 2 imposes a peak current accordingly to the
load value. If the load demand decreases, the internal loop
asks for less peak current. When this setpoint reaches a
determined level (Vpin 1), the IC prevents the current from
decreasing further down and starts to blank the output
pulses: the IC enters the so ? called skip cycle mode, also
named controlled burst operation. The power transfer now
depends upon the width of the pulse bunches (Figure 17).
Suppose we have the following component values:
Lp, primary inductance = 350 m H
Fsw , switching frequency = 61 kHz
Ip skip = 600 mA (or 333 mV/Rsense)
Figure 16.
When FB is above the skip cycle threshold (1.0 V by
default), the peak current cannot exceed 1.0 V/Rsense.
When the IC enters the skip cycle mode, the peak current
cannot go below Vpin1/3.3/Rsense. The user still has the
flexibility to alter this 1.0 V by either shunting pin 1 to
ground through a resistor or raising it through a resistor up
to the desired level. Grounding pin 1 permanently
invalidates the skip cycle operation. However, given the
extremely low standby power the controller can reach, the
PWM in no ? load conditions can quickly enter the minimum
t on and still transfer too much power. An instability can take
place. We recommend in that case to leave a little bit of skip
level to always allow 0% duty cycle.
http://onsemi.com
9
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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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