参数资料
| 型号： | NCP1396BDR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 18/25页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR ISO PWM VM 16-SOIC |
| 产品变化通告： | Package Pin Removal 11/Feb/2008 |
| 标准包装： | 1 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 575kHz |
| 占空比： | 52% |
| 电源电压： | 10.5 V ~ 20 V |
| 降压： | 无 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽）15 引线 |
| 包装： | 标准包装 |
| 其它名称： | NCP1396BDR2GOSDKR |
NCP1396A, NCP1396B
During the discharge time, the clock comparator is high
and un-- validates the AND gates: both outputs are low.
When the comparator goes back to the low level, during the
timing capacitor Ct recharge time, A and B outputs are
validated. By connecting a resistor RDT to ground, it
over the VCO lead as soon as the output voltage has reached
the target. If not, then the minimum switching frequency is
reached and a fault is detected on the feedback pin
(typically below 600 mV). Figure 41 depicts a typical
frequency evolution with soft-- start.
creates a current whose image serves to discharge the Ct
capacitor: we control the dead-- time. The typical range
evolves between 100 ns (RDT = 3.5 k Ω ) and 2 m s (RDT =
83.5 k Ω ). Figure 43 shows the typical waveforms.
Soft--start Sequence
In resonant controllers, a soft-- start is needed to avoid
suddenly applying the full current into the resonating
Fmax
Fsw
If no FB
Action
circuit. In this controller, a soft-- start capacitor connects to
pin 1 and offers a smooth frequency variation upon
start-- up: when the circuit starts to pulse, the VCO is pushed
to the maximum switching frequency imposed by pin 2.
Then, it linearly decreases its frequency toward the
minimum frequency selected by a resistor on pin 4. Of
course, practically, the feedback loop is suppose to take
20.0
10.0
Fmin
Soft--start Duration
Figure 41. Soft--start Behavior
Vss
0
--10.0
--20.0
177
SS
Action
Ires
175
173
171
169
Target is
Reached
Vout
200 m
600 m
1.00 m
1.40 m
1.80 m
time in seconds
Figure 42. A Typical Start--up Sequence on a LLC Converter
Please note that the soft-- start will be activated in the
following conditions:
- A startup sequence
- During auto-- recovery burst mode
- A brown-- out recovery
- A temperature shutdown recovery
The fast fault input undergoes a special treatment. Since
we want to implement skip cycle through the fast fault
input on the NCP1396A, we cannot activate the soft-- start
every time the feedback pin stops the operations in low
no soft-- start occurs to offer the best skip cycle behavior.
However, it is very possible to combine skip cycle and true
fast fault input, e.g. via ORing diodes driving pin 6. In that
case, if a signal maintains the fast fault input high long
enough to bring the feedback level down (that is to say
below 0.6 V) since the output voltage starts to fall down,
then the soft-- start is activated after the release of the pin.
In the B version tailored to operate from an auxiliary 12 V
power supply, the soft-- start is always activated upon the
fast fault input release, whatever the feedback condition is.
power mode. Therefore, when the fast fault pin is released,
http://onsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| NCP1396BPG | 功能描述:电压模式 PWM 控制器 RESONANT MODE CNTRLR W/ H/L SIDES DRIVERS RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| NCP1396D | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:High Performance Resonant Mode Controller featuring High--Voltage Drivers |
| NCP1397A | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:High Performance Resonant Mode Controller with Integrated High-Voltage Drivers |
| NCP1397ADR2G | 功能描述:电流型 PWM 控制器 NCP1397A 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 |
| NCP1397B | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:High Performance Resonant Mode Controller with Integrated High-Voltage Drivers |
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