参数资料
| 型号： | NCP1381DR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 15/25页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR FLYBK ISO CM 14SOIC |
| 标准包装： | 1 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 125kHz |
| 电源电压： | 11 V ~ 20 V |
| 降压： | 无 |
| 升压： | 无 |
| 回扫： | 是 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 是 |
| 工作温度： | 0°C ~ 125°C |
| 封装/外壳： | 14-SOIC（0.154"，3.90mm 宽） |
| 包装： | 剪切带 (CT) |
| 其它名称： | NCP1381DR2GOSCT |
NCP1381, NCP1382
As one can observe, the output power runs out of the initial
100 W specification when we enter the high line region. To
cope with this problem, we need to compensate the
controller in such a way that its peak capability gets reduced
at higher input voltages. How much do we need to
compensate the peak excursion? We can find the answer by
calculating Δ I P = I PLL -- I PHL , with V inLL = 200 V and V inHL
= 400 V. With our previous numbers, Δ I P = 588 mA. We
therefore need to instruct the controller to reduce its peak
excursion by 588 mA at high line. Otherwise speaking, if we
think in voltages, the CS pin excursion shall drop from 0.8 V
(at low line, the maximum peak is 0.8 / R S ) to (3.2 -- 0.588).
V bulk
0.25 = 653 mV at high line. Figure 19 shows the situation at
both line levels. A possible solution lies in offsetting the
current floor by the necessary value, which is, in our case,
0.8 -- 0.653 = 147 mV. The traditional way of doing this goes
through the wiring of a high value resistor to the bulk
capacitor. This unfortunately dissipates heat. The
NCP1381/82 offers a more elegant option since it
transforms the voltage available from the Brown--out pin
into a fixed current, routed to the CS pin. That way, we can
calculate a resistor value which, once inserted in series with
current sense voltage image, will create our necessary offset.
Figure 20 shows this internal connection:
G1
80 m S
To BO
--
+
BO
105
100
Comp.
CS
R offset
95
R sense
90
200
250
300
350
400
? ? Vout + VF +
?
PO(Vin) : =
(eq. 5)
To CS Comp.
Figure 20. A Transconductance Amplifiers
Transforms the BO Voltage into a Current
We can now calculate our R offset resistor to generate the
necessary static voltage. Suppose that the BO network
divides the bulk voltage by 400 (V BO = α . V in = 0.0025 x
V in ). Therefore, in presence of a 400 V input voltage, we
will have 1 V on the BO pin. due to the transconductance
amplifier of a 80 m S gm, it will turn into a 80 m A offset
current. To get our 147 mV, we just divide it by 80 m A:
R offset = V offset / V inHL x α . g m = 1.8 k Ω .
We can now update Equation 4 with Equation 5, where
the peak current is affected by the variable offset:
R L P S
? 0.8 + V in ? tP ? Vin ? α ? gm ? Roffset ?
2 Vin
( η ? (Vin ? (Vout + VF))) N
If we now plot the compensated curve, we obtain
V in , VOLTAGE (V)
Figure 21. The Compensated Converter Output
Power Response to Input Variations
were originally shooting for and the total power excursion
is now kept within 15 W.
Overvoltage Protection
The NCP1381/82 features an overvoltage protection
made by sensing the plateau voltage at the switch turn--off.
However, a sampling delay is introduced to avoid
considering the leakage inductance. When the
demagnetization pin goes above V demlatch , the comparator
goes high. If this condition is maintained when the sampling
pulse arrives, then a fault is latched. Figure 22 shows the
arrangement and Figure 23 portrays a typical waveform.
Once latched, the controller stops all driving pulses and V CC
is clamped to 6 V. Reset occurs when the user unplugs the
converter from the mains and V CC reduces below 4 V.
Figure 21 graph. The output power is slightly above what we
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| NCP1382DR2G | 功能描述:电流型 PWM 控制器 L-STNDBY PWM CNTRLR 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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| NCP1392DDR2G | 功能描述:功率驱动器IC HV HALF-BRIDGE DRIVER RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
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