参数资料
| 型号： | NCP4302BDR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 14/16页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR FLYBK ISO PWM 8SOIC |
| 标准包装： | 1 |
| PWM 型： | 控制器 |
| 输出数： | 1 |
| 频率 - 最大： | 250kHz |
| 电源电压： | 9.2 V ~ 28 V |
| 降压： | 无 |
| 升压： | 无 |
| 回扫： | 是 |
| 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： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 剪切带 (CT) |
| 其它名称： | NCP4302BDR2GOSCT |
NCP4302
Discontinuous Condition Mode
SP DRV
SP DRV
I pk
I PRM
I SEC,PK
Body ? Diode
Conduction
Time
I SEC
I SEC
I peak
I vally
I peak,sec
SYNC DRV
t p1
Figure 31. Discontinuous Conduction Mode
SYNC DRV
t delay1
t delay2
Body ? Diode
Conduction
Time
Waveforms
t p1 is the propagation delay from the SYNC/CS input to the
drive output.
TRIG
Figure 32. Continuous Conduction Mode Waveforms
Continuous Conduction Mode
When operating in continuous conduction mode (CCM)
the current in the secondary doesn’t fall to zero prior to
P sync + P ON ) P Qrr ) P d P ) PP OFF
(eq. 8)
turning on the primary side MOSFET. To eliminate cross
conduction losses (have the primary side MOSFET and
secondary side MOSFET on at the same time) the trigger
I sec,RMS [
I sec,peak *
D I L sec
2
1 * D
(eq. 9)
input to the NCP4302 must be utilized. A signal which leads
I sec,RMS [
the Primary Side (SP) MOSFET turning on must be coupled
to the TRIG input of the NCP4302 which will turn ? off the
SS MOSFET referring to Figure 32.
2
I sec,peak *
D I L sec
2
2
1 * D
(eq. 10)
When the energy transfer begins in the transformer
secondary, prior to the secondary side synchronous
MOSFET turning ? on, the secondary current flows through
Combining equations 9 and 10,
D IL sec + (1 * D)T
the synchronous rectifiers MOSFET’s (SS) internal body
diode (SSD). To minimize the power loss in the internal
body the controller propagation delay has been minimized
in the NCP4302.
V OUT ) V f
LM
n 2
P on + I sec,RMS 2 @ R DS(on)
(eq. 11)
(eq. 12)
P QRR + Q RR V OUT )
V IN
n
f
(eq. 13)
P BODY_DIODE + V f @ I OUT @ f (t delay1 ) td delay2 )
(eq. 14)
P off + 1 @ C OSS V out ) n in
2
V
2
@ f
(eq. 15)
Q RR is the recovery charge of the internal body diode
Coss is the MOSFET drain to source capacitance
L M is the transformer primary inductance
http://onsemi.com
14
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相关代理商/技术参数 |
参数描述 |
|---|---|
| NCP4303A | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Secondary Side Synchronous Rectification Driver for High Efficiency SMPS Topologies |
| NCP4303ADR2G | 功能描述:初级与次级侧 PWM 控制器 SEC SIDE SYNC RECT DRV 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 |
| NCP4303AMNTWG | 功能描述:IC CTLR/DVR SYNC RECT 8-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电源控制器，监视器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 应用:多相控制器 输入电压:- 电源电压:9 V ~ 14 V 电流 - 电源:- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（5x5） 包装:带卷 (TR) |
| NCP4303B | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Secondary Side Synchronous Rectification Driver for High Efficiency SMPS Topologies |
| NCP4303BDR2G | 功能描述:初级与次级侧 PWM 控制器 SEC SIDE SYNC RECT DRV 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 |
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