参数资料
型号: NCP1237AD65R2G
厂商: ON Semiconductor
文件页数: 18/41页
文件大小: 0K
描述: IC REG CTRLR FLYBACK PWM 7SOIC
标准包装: 1
PWM 型: 电流模式
输出数: 1
频率 - 最大: 70kHz
占空比: 85%
电源电压: 9.5 V ~ 28 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 125°C
封装/外壳: 8-SOIC(0.154",3.90mm 宽)7 引线
包装: 标准包装
其它名称: NCP1237AD65R2GOSDKR
NCP1237
At startup, the current source turns on when the voltage on
the HV pin is higher than V HV(min) , and turns off when V CC
reaches V CC(on) . It turns on again when V CC reaches
V CC(min) . This sequence repeats until the input voltage is
high enough to ensure a proper startup, i.e. when V HV
reaches V HV(start) . The switching actually starts the next
time V CC reaches V CC(on) , as shown in Figure 5.
Even though the DSS is able to maintain the V CC voltage
between V CC(on) and V CC(min) by turning the HV startup
current source on and off, it can only be used in light load
conditions, otherwise the power dissipation on the die would
be too high. As a result, an auxiliary voltage source is needed
to supply V CC during normal operation.
The DSS is useful to keep the controller alive when no
switching pulses are delivered, e.g. in a brown ? out
condition, or to prevent the controller from stopping during
load transients when the V CC might drop below V CC(off) .
V HV
V HV(start)
Waits
next
V CC(on)
before
V HV(min)
V CC
V CC(on)
V CC(min)
HV
starting
time
V CC(inhibit)
current
source =
I start1
HV
current
source =
I start2
time
DRV
Figure 44. Startup Timing Diagram
http://onsemi.com
18
time
相关PDF资料
PDF描述
NCP1238BD65R2G IC REG CTRLR FLYBACK PWM 7SOIC
NCP1246BD100R2G IC CTLR CURR MODE 65KHZ 8SOIC
NCP1252ADR2G IC REG CTRLR FLYBK ISO PWM 8SOIC
NCP1271P65G IC CTRLR PWM CM OVP OTP HV 7DIP
NCP1280DR2G IC CTRLR PWM PROG OVP HV 16SOIC
相关代理商/技术参数
参数描述
NCP1237BD65R2G 功能描述:电流型 PWM 控制器 DSS AUTOR DOCP 65KHZ 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
NCP1237PRINTGEVB 功能描述:电源管理IC开发工具 32W, 32V PRINTER ADAPTER 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
NCP1238 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Fixed Frequency Current Mode Controller for Flyback Converters
NCP1238AD65R2G 功能描述:电流型 PWM 控制器 DSS LATCH SOCP 65KHZ 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
NCP1238BD65R2G 功能描述:电流型 PWM 控制器 DSS AUTOR SOCP 65KHZ 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