- 您现在的位置：买卖IC网 > PDF目录17195 > NCP1014LEDGTGEVB (ON Semiconductor)BOARD EVAL 90-305VAC 8W LED DVR PDF资料下载
参数资料
| 型号： | NCP1014LEDGTGEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 9/24页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL 90-305VAC 8W LED DVR |
| 设计资源： | NCP1014LEDGTGEVB Gerber Files NCP1014LEDGTGEVB Bill of Materials |
| 标准包装： | 1 |
| 系列： | Greenpoint™ |
| 电流 - 输出 / 通道： | 630mA |
| 输出及类型： | 1，隔离 |
| 输出电压： | 20V |
| 输入电压： | 90 ~ 305VAC |
| 已供物品： | 板 |
| 已用 IC / 零件： | NCP1014 |
| 其它名称： | NCP1014LEDGTGEVB-ND NCP1014LEDGTGEVBOS |
NCP1010, NCP1011, NCP1012, NCP1013, NCP1014
8.00
6.00
4.00
Vcc
Device
8.5 V
7.5 V
2.00
Internally
Pulses
0
Startup Period
Figure 14. The Charge/Discharge Cycle Over a 10 m F V CC Capacitor
The protection burst duty--cycle can easily be computed
through the various timing events as portrayed by Figure 16.
Being loaded by the circuit consumption, the voltage on
the V CC capacitor goes down. When the DSS controller
detects that V CC has reached 7.5 V (VCC ON ), it activates the
internal current source to bring V CC toward 8.5 V and stops
again: a cycle takes place whose low frequency depends on
the V CC capacitor and the IC consumption. A 1.0 V ripple
takes place on the V CC pin whose average value equals
(VCC OFF + VCC ON )/2. Figure 14 portrays a typical
operation of the DSS.
As one can see, the V CC capacitor shall be dimensioned to
offer an adequate startup time, i.e. ensure regulation is
reached before V CC crosses 7.5 V (otherwise the part enters
the fault condition mode). If we know that Δ V = 1.0 V
for the presence of the error flag every time V CC crosses
VCC ON . If the error flag is low (peak limit not active) then
the IC works normally. If the error signal is active, then the
NCP101X immediately stops the output pulses, reduces its
internal current consumption and does not allow the startup
source to activate: V CC drops toward ground until it reaches
the so--called latch--off level, where the current source
activates again to attempt a new restart. When the error is
gone, the IC automatically resumes its operation. If the
default is still there, the IC pulses during 8.5 V down to 7.5 V
and enters a new latch--off phase. The resulting burst
operation guarantees a low average power dissipation and
lets the SMPS sustain a permanent short--circuit. Figure 15
shows the corresponding diagram.
and ICC1 (max) is 1.1 mA (for instance we selected an 11 Ω
device switching at 65 kHz), then the V CC capacitor can
4V
Current Sense
Information
ICC1 · tstartup (eq. 1) . Let’s
be calculated using: C ≥
Δ V
suppose that the SMPS needs 10 ms to startup, then we will
calculate C to offer a 15 ms period. As a result, C should be
greater than 20 m F thus the selection of a 33 m F/16 V
capacitor is appropriate.
FB
Division
Max
Ip
V CC
+
--
VCC ON
Signal
To
Latch
Reset
Short Circuit Protection
The internal protection circuitry involves a patented
arrangement that permanently monitors the assertion of an
internal error flag. This error flag is, in fact, a signal that
instructs the controller that the internal maximum peak
current limit is reached. This naturally occurs during the
startup period (Vout is not stabilized to the target value) or
Clamp
Active?
Flag
when the optocoupler LED is no longer biased, e.g. in a
short--circuit condition or when the feedback network is
broken. When the DSS normally operates, the logic checks
Figure 15. Simplified NCP101X Short--Circuit
Detection Circuitry
http://onsemi.com
9
相关PDF资料 |
PDF描述 |
|---|---|
| T95S474M035HSSL | CAP TANT 0.47UF 35V 20% 1507 |
| LK1608R39K-T | INDUCTOR 0.39UH 10% 0603 SMD |
| TC4427AVOA713 | IC MOSFET DVR 1.5A DUAL HS 8SOIC |
| RNM-3.309S/H | CONV DC/DC 1W 3.3VIN 09VOUT |
| R1DA-050505-R | CONV DC/DC 1W 5V IN 5/5V OUT |
相关代理商/技术参数 |
参数描述 |
|---|---|
| NCP1014LEDR2GEVB | 功能描述:EVAL BOARD LED DRIVER RoHS:是 类别:编程器，开发系统 >> 评估板 - LED 驱动器 系列:- 标准包装:1 系列:PowerWise® 电流 - 输出 / 通道:20mA 输出及类型:1，非隔离 输出电压:17V 特点:可调光 输入电压:2.7 ~ 5.5 V 已供物品:板 已用 IC / 零件:LM3508 相关产品:LM3508TLX-ND - IC LED DRVR WHT BCKLGT 9USMDLM3508TLDKR-ND - IC LED DRVR WHT BCKLGT 9MICROSMDLM3508TLCT-ND - IC LED DRVR WHT BCKLGT 9MICROSMDLM3508TLTR-ND - IC LED DRVR WHT BCKLGT 9MICROSMD |
| NCP1014ST100T3 | 功能描述:电流型 PWM 控制器 Low Standby Power 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 |
| NCP1014ST100T3G | 功能描述:电流型 PWM 控制器 Low Standby Power Monolithic Switcher 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 |
| NCP1014ST65T3 | 功能描述:电流型 PWM 控制器 Low Standby Power 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 |
| NCP1014ST65T3G | 功能描述:电流型 PWM 控制器 Low Standby Power Monolithic Switcher 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 |
发布紧急采购，3分钟左右您将得到回复。