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| 型号： | NCP1378DR2 |
| 厂商： | ON Semiconductor |
| 文件页数： | 8/15页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR FLYBACK PWM 8-SOIC |
| 产品变化通告： | LTB Notification 03/Jan/2008 |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 100kHz |
| 电源电压： | 8.2 V ~ 18 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： | 无 |
| 工作温度： | 0°C ~ 125°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 其它名称： | NCP1378DR2OS |
NCP1378
Once the power supply has started, the Vcc shall be
constrained below 16 V, which is the maximum rating on
pin 6. Figure 16 portrays a typical NCP1378 startup
sequence with a Vcc regulated at 8.0 V.
9.0
Skipping Cycle Mode
The NCP1378 automatically skips switching cycles
when the output power demand drops below a given
level. This is accomplished by monitoring the FB pin. In
normal 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
8.0
7.0
8.4 V
Regulation
a determined level, 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) and follows the following formula:
1 · Lp · Ip2 · Fsw · D
6.0
2
burst with:
5.0
3.00M 8.00M 13.0M 18.0M 23.0M
time in secs
Figure 16. A Typical Startup Sequence
for the NCP1378
Normal Current Mode Operation
Lp = Primary inductance
Fsw = Switching frequency within the burst
Ip = Peak current at which skip cycle occurs
D burst = Burst width/burst recurrence
300
MAX PEAK
CURRENT
200
100
SKIP CYCLE
CURRENT LIMIT
RESET
-
+
3
DRIVER = HIGH ? I = 0
DRIVER = LOW ? I = 200 m A
R skip
0
WIDTH
RECURRENCE
+
2
R sense
Figure 17. The Skip Cycle Takes Place at Low Peak
Currents which Guarantees Noise--Free Operation
The skip level selection is done through a simple resistor
inserted between the current sense input and the sense
element. Every time the NCP1378 output driver goes low,
a 200 m A source forces a current to flow through the sense
pin (Figure 18): when the driver is high, the current source
is off and the current sense information is normally
processed. As soon as the driver goes low, the current
source delivers 200 m A and develops a ground referenced
voltage across Rskip. If this voltage is below the feedback
voltage, the current sense comparator stays in the low state
and the internal latch can be triggered by the next clock
cycle. Now, if because of a low load mode the feedback
Figure 18. A Patented Method Allows for Skip
Level Selection via a Series Resistor Inserted in
Series with the Current
voltage is below Rskip level, then the current sense
comparator permanently resets the latch and the next clock
cycle (given by the demagnetization detection) is ignored:
we are skipping cycles as shown by Figure 17. As soon as
the feedback voltage goes up again, there can be two
situations: the recurrent period is small and a new
demagnetization detection (next wave) signal triggers the
NCP1378. To the opposite, in low output power conditions,
no more ringing waves are present on the drain and the
toggling of the current sense comparator alone initiates a
new cycle start. Figure 19 depicts these two different
situations.
http://onsemi.com
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| NCP1378DR2G | 功能描述:电流型 PWM 控制器 Quasi Resonant 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 |
| NCP1378P | 功能描述:电流型 PWM 控制器 Quasi Resonant 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 |
| NCP1378PG | 功能描述:电流型 PWM 控制器 Quasi Resonant 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 |
| NCP1379 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Quasi-Resonant Current-Mode Controller for High-Power Universal Off-line Supplies |
| NCP1379_11 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Quasi-Resonant Current-Mode Controller for High-Power Universal Off-line Supplies |
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