参数资料
| 型号： | NCP4326DR2 |
| 厂商： | ON Semiconductor |
| 文件页数： | 20/29页 |
| 文件大小： | 0K |
| 描述： | IC SECONDARY CTLR SW PS 16-SOIC |
| 产品变化通告： | Discontinuation 30/Jun/2006 |
| 标准包装： | 2,500 |
| 应用： | 次级控制器，准谐振切换模式电源 |
| 输入电压： | 15V |
| 输出数： | 3 |
| 工作温度： | 0°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SOIC |
| 包装： | 带卷 (TR) |
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页第16页第17页第18页第19页当前第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页
NCP4326
Detailed Soft ? Start Behavior
A soft ? start is proposed to avoid a high peak current
during startup sequences in trailing edge mode control.
Increasing smoothly the secondary duty cycle from zero to
the nominal value in trailing edge mode control does not
limit this current (see Figure 43).
NCP4326 is a voltage mode controller type (i.e. the
secondary peak current is not sensed); the peak current
sensing can not be used to ensure a proper peak current ramp
up on secondary side.
Instead of controlling the peak current ramp up, if the
secondary controller smoothly ramps up the duty cycle then
the result will not yield a smooth ramp up peak current as in
conventional PWM controllers (see Figure 43).
As depicted in Figure 43, when the secondary duty cycle
is increased smoothly the peak current does not ramp up. It
is not possible to have a ramp up peak current because at the
beginning of the OFF time period the flux stored in the
flyback transformer is at the maximum value so the peak
current yields by this flux will be also at a maximum value.
Consequently, the peak current is not linked to the duty cycle
width. The peak current is only linked to the energy stored
in the flyback transformer and the current sharing during the
primary OFF time.
0
Vsync
VCt
ON Tim e
OFF Time
t
0
Transformateur Flux
0
DRV
0
ID2
0
Verror
t
t
t
t
Figure 43. Increasing Smoothly the Duty Cycle Does Not Yield a Smooth Peak Current Ramp up
http://onsemi.com
20
相关PDF资料 |
PDF描述 |
|---|---|
| X5169S8 | IC SUPERVISOR CPU 16K EE 8-SOIC |
| X5168PI-2.7 | IC SUPERVISOR CPU 16K EE 8-DIP |
| EEV-HA1H101UP | CAP ALUM 100UF 50V 20% SMD |
| X5323S8-2.7T1 | IC SUPERVISOR CPU 32K EE 8-SOIC |
| X5323S8-2.7AT1 | IC SUPERVISOR CPU 32K EE 8-SOIC |
相关代理商/技术参数 |
参数描述 |
|---|---|
| NCP4326DR2G | 功能描述:初级与次级侧 PWM 控制器 Quasi Resonant Secondary Side RoHS:否 制造商:ON Semiconductor 输出端数量:1 开关频率:250 KHz 工作电源电压:- 0.3 V to + 28 V 最大工作温度:+ 85 C 最小工作温度:- 5 C 封装 / 箱体:SOIC-8 Narrow 封装:Reel |
| NCP4328 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Secondary Side CV/CC Controller |
| NCP4328BSNT1G | 制造商:ON Semiconductor 功能描述:REEL / SECONDARY SIDE CONSTANT V |
| NCP432B | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Programmable Precision References |
| NCP432BCSNT1G | 制造商:ON Semiconductor 功能描述:PROGRAMMABLE PRECISION RE - Tape and Reel 制造商:ON Semiconductor 功能描述:REEL / PROGRAMMABLE PRECISION RE |
发布紧急采购，3分钟左右您将得到回复。