- 您现在的位置：买卖IC网 > PDF目录15495 > NCP1395APG (ON Semiconductor)IC REG CTRLR PWM VM 16-DIP PDF资料下载
参数资料
| 型号： | NCP1395APG |
| 厂商： | ON Semiconductor |
| 文件页数： | 16/27页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR PWM VM 16-DIP |
| 标准包装： | 25 |
| PWM 型： | 电压模式 |
| 输出数： | 2 |
| 频率 - 最大： | 1.11MHz |
| 占空比： | 52% |
| 电源电压： | 9.3 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： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 16-DIP（0.300"，7.62mm） |
| 包装： | 管件 |
| 其它名称： | NCP1395APG-ND NCP1395APGOS |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页当前第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页
NCP1395A/B
The designer needs to program the maximum switching
frequency and the minimum switching frequency. In LLC
configurations, for circuits working above the resonant
frequency, a high precision is required on the minimum
frequency, hence the " 3% specification. This minimum
switching frequency is actually reached when no feedback
Figures 35 and 36 portray the frequency evolution
depending on the feedback pin voltage level in a different
frequency clamp combination.
F A&B
closes the loop. It can happen during the startup sequence,
a strong output transient loading or in a short ? circuit
Fmax
No variations
1 MHz
condition. By installing a resistor from pin 1 to AGND, the
minimum frequency is set. Using the same philosophy,
wiring a resistor from pin 2 to AGND will set the maximum
frequency excursion. To improve the circuit protection
D Fsw = 950 kHz
features, we have purposely created a dead zone, where the
feedback loop has no action. This is typically below 1.3 V.
Fmin
50 kHz
6V
1.3 V D
Figure 34 details the arrangement where the internal
voltage (that drives the VCO) varies between 0 and 3.6 V.
However, to create this swing, the feedback pin (to which
the optocoupler emitter connects), will need to swing
typically between 1.3 V and 6.0 V.
V CC
VFB
Fault
area VFB = 4.7V
0.6 V
Figure 35. Maximal default excursion, Rt = 120 k W
on pin 1 and Rfmax = 35 k W on pin 2.
VFB = 1.3 ? 6 V
To VCO
F A&B
FB
+
?
0 to 3.6 V
Fmax
No variations
450 kHz
Rfb
D Fsw = 300 kHz
+
1.3 V
Fmin
150 kHz
VFB
6V
1.3 V D
slope will then be
+ 202 kHz V.
Figure 34. The OPAMP arrangement limits the VCO
internal modulation signal between 0 and 5.0 V.
This technique allows us to detect a fault on the converter
in case the FB pin cannot rise above 1.3 V (to actually close
the loop) in less than a duration imposed by the
programmable timer. Please refer to the fault section for
detailed operation of this mode.
As shown in Figure 34, the internal dynamics of the
VCO control voltage will be constrained between 0 V and
3.6 V, whereas the feedback loop will drive pin 5 (FB)
between 1.3 V and 6.0 V. If we take the external excursion
numbers, 1.3 V = 50 kHz, 6.0 V = 1.0 MHz, then the VCO
1 Meg ? 50 k
4.7
Fault
area VFB = 4.7 V
0.6 V
Figure 36. Here a different minimum frequency
was programmed as well as a different maximum
frequency excursion.
Please note that the previous small signal VCO slope has
now been reduced to 300 k/5.0 = 62.5 kHz/V. This offers
a mean to magnify the feedback excursion on systems
where the load range does not generate a wide switching
frequency excursion. Due to this option, we will see how
it becomes possible to observe the feedback level and
implement skip cycle at light loads. It is important to note
that the frequency evolution does not have a real linear
relationship with the feedback voltage. This is due to the
deadtime presence which stays constant as the switching
period changes.
http://onsemi.com
16
相关PDF资料 |
PDF描述 |
|---|---|
| 4302-223K | INDUCTOR TEMP STABLE 22UH SMD |
| 4302-183K | INDUCTOR TEMP STABLE 18UH SMD |
| 4302-153K | INDUCTOR TEMP STABLE 15UH SMD |
| 4302-123K | INDUCTOR TEMP STABLE 12UH SMD |
| 4302-103K | INDUCTOR TEMP STABLE 10UH SMD |
相关代理商/技术参数 |
参数描述 |
|---|---|
| NCP1395B | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:High Performance Resonant Mode Controller |
| NCP1395BDR2G | 功能描述:电压模式 PWM 控制器 PWM CONTROLLER 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 |
| NCP1395BPG | 功能描述:电压模式 PWM 控制器 PWM CONTROLLER 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 |
| NCP1395D | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:High Performance Resonant Mode Controller |
| NCP1395LLCGEVB | 功能描述:BOARD EVAL NCP1395 RoHS:是 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:* 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:True Shutdown™ 主要目的:DC/DC，步升 输出及类型:1，非隔离 功率 - 输出:- 输出电压:- 电流 - 输出:1A 输入电压:2.5 V ~ 5.5 V 稳压器拓扑结构:升压 频率 - 开关:3MHz 板类型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
发布紧急采购，3分钟左右您将得到回复。