- 您现在的位置：买卖IC网 > Datasheet目录345 > NCP1605FORWGEVB (ON Semiconductor)EVAL BOARD FOR NCP1605FORWG Datasheet资料下载
参数资料
| 型号： | NCP1605FORWGEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 9/19页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR NCP1605FORWG |
| 设计资源： | NCP1605FORWGEVB BOM NCP1605FORWGEVB Gerber Files NCP1605 EVB Schematic |
| 标准包装： | 1 |
| 主要目的： | AC/DC，主面和辅面，带 PFC |
| 输出及类型： | 1，隔离 |
| 输出电压： | 19V |
| 电流 - 输出： | 8A |
| 输入电压： | 90 ~ 265VAC |
| 稳压器拓扑结构： | 正向转换器 |
| 频率 - 开关： | 133kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | NCP1217，NCP1605 |
| 其它名称： | NCP1605FORWGEVBOS |
NCP1217, NCP1217A
Startup Sequence
When the power supply is first powered from the mains
outlet, the internal current source (typically 7.0 mA) is
biased and charges up the V CC capacitor. When the voltage
on this V CC capacitor reaches the VCC ON level (typically
12.8 V), the current source turns off and no longer wastes
any power. At this time, the V CC capacitor only supplies the
controller and the auxiliary supply is supposed to take over
before V CC collapses below VCC min . Figure 16 shows the
internal arrangement of this structure.
8
HV
12.8 V/5.6 V
+
--
6 mA or 0
6
CV CC
Aux
4
Figure 16. The Current Source Brings V CC Above 12.8 V and then Turns Off
Once the power supply has started, the V CC shall be
constrained below 16 V, which is the maximum rating on
Pin 6. Figure 17 portrays a typical startup sequence with a
V CC regulated at 12.5 V.
13.5
level, preventing a bias current to circulate in the
optocoupler LED. As a result, the auxiliary voltage also
decreases because it also operates in Flyback and thus
duplicates the output voltage, providing the leakage
inductance between windings is kept low. To account for this
situation and properly protect the power supply, NCP1217
hosts a dedicated overload detection circuitry. Once
12.5
11.5
12.8 V
REGULATION
activated, this circuitry imposes to deliver pulses in a burst
manner with a low duty--cycle. The system auto--recovers
when the fault condition disappears.
During the startup phase, the peak current is pushed to the
maximum until the output voltage reaches its target and the
feedback loop takes over. The auxiliary voltage takes place
10.5
9.5
3.00 M 8.00 M 13.0 M 18.0 M 23.0 M
t, TIME (sec)
Figure 17. A Typical Startup Sequence for
the NCP1217
Overload Operation
In applications where the output current is purposely not
controlled (e.g. wall adapters delivering raw DC level), it is
interesting to implement a true short--circuit protection. A
short--circuit actually forces the output voltage to be at a low
after a few switching cycles and self--supplies the IC. In
presence of a short circuit on the output, the auxiliary
voltage will go down until it crosses the undervoltage
lockout level of typically 7.6 V. When this happens,
NCP1217 immediately stops the switching pulses and
unbiases all unnecessary logical blocks. The overall
consumption drops, while keeping the gate grounded, and
the V CC slowly falls down. As soon as V CC reaches typically
5.6 V, the startup source turns--on again and a new startup
sequence occurs, bringing V CC toward 12.8 V as an attempt
to restart. If the default has gone, then the power supply
normally restarts. If not, a new protective burst is initiated,
shielding the SMPS from any runaway. Figure 18 portrays
the typical operating signals in short circuit.
http://onsemi.com
9
相关PDF资料 |
PDF描述 |
|---|---|
| NCP1840Q8A6MNTWG | IC LED DRIVER 12CH PROGR 20QFN |
| NCP1910GEVB | BOARD DEMO NCP1910DEMO-B-TLS |
| NCP3418BMNR2G | IC MOSFET DRIVER DUAL 12V 10-DFN |
| NCP3418DR2 | IC MOSFET DRIVER DUAL 12V 8-SOIC |
| NCP3420DR2G | IC MOSFET DRIVER DUAL 12V 8-SOIC |
相关代理商/技术参数 |
参数描述 |
|---|---|
| NCP1605LCDTVGEVB | 功能描述:BOARD EVAL NCP1605/1396 RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:* 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:- 主要目的:电源管理，电池充电器 嵌入式:否 已用 IC / 零件:MAX8903A 主要属性:1 芯锂离子电池 次要属性:状态 LED 已供物品:板 |
| NCP1606ADR2G | 功能描述:功率因数校正 IC PWR FCTR CONTROLLER RoHS:否 制造商:Fairchild Semiconductor 开关频率:300 KHz 最大功率耗散: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
| NCP1606APG | 功能描述:功率因数校正 IC LO CST PWR FCTR CONT RoHS:否 制造商:Fairchild Semiconductor 开关频率:300 KHz 最大功率耗散: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
| NCP1606BDR2G | 功能描述:功率因数校正 IC PWR FCTR CONTROLLER RoHS:否 制造商:Fairchild Semiconductor 开关频率:300 KHz 最大功率耗散: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
| NCP1606BOOSTGEVB | 功能描述:电源管理IC开发工具 OSPI NCP1606 100 W BOOST RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
发布紧急采购，3分钟左右您将得到回复。