参数资料
| 型号： | NCP1238BD65R2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 1/38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： | 无 |
| 升压： | 无 |
| 回扫： | 是 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 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： | NCP1238BD65R2GOSDKR |
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NCP1238
Fixed Frequency Current
Mode Controller for Flyback
Converters
The NCP1238 is a new generation of the NCP12xx fixed ? frequency
current ? mode controllers featuring Dynamic Self ? Supply (DSS),
pin ? to ? pin compatible with the previous generation.
http://onsemi.com
The DSS function greatly simplifies the design of the auxiliary supply
and the V CC capacitor by activating the internal startup current source to
supply the controller during transients.
Due to its proprietary Soft ? Skip ? mode combined with frequency
foldback, the controller exhibits excellent efficiency in light load
condition while still achieving very low standby power consumption.
This Soft ? Skip feature also dramatically reduces the risk of acoustic
SOIC ? 7
CASE 751U
8
1
MARKING
DIAGRAM
38Xff
ALYWX
G
noise, which enables the use of inexpensive transformers and
capacitors in the clamping network.
Internal frequency jittering, ramp compensation, and a versatile
latch input make this controller an excellent candidate for converters
where ruggedness and components cost are the key constraints.
In addition, the controller includes a new high voltage circuitry that
combines a startup current source and a brown ? out / line OVP detector
able to sense the input voltage either from the rectified ac line or the dc
filtered bulk voltage.
Finally, due to a careful design, the precision of critical parameters
is well controlled over the entire temperature range ( ? 40 ° C to
+125 ° C), enabling easier design and increased safety (e.g. ± 5% for the
peak current limit, ± 7% for the oscillator).
38Xff = Specific Device Code
X = A or B
ff = 65, 00, or 33
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
G = Pb ? Free Package
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 37 of this data sheet.
Features
? Timer ? Based Overload Protections with Auto ?
Recovery (Option B) or Latched (Option A) Operation
? High ? Voltage Current Source with DSS with Built ? in
Brown ? out and Line Overvoltage Protections
? Fixed ? Frequency Current ? Mode Operation with
Built ? in Ramp Compensation
? Frequency Jittering for a Reduced EMI Signature
? Adjustable Overpower Compensation
? Latch ? off Input for Severe Fault Conditions, with
Direct Connection of an NTC for Overtemperature
Protection (OTP)
? Protection Against Winding Short ? Circuit
? Frequency Foldback transitioning into Soft ? Skip for
Improved Performance in Standby
? 65 kHz Oscillator (100 kHz and 133 kHz Versions
Available Upon Request)
? V CC Operation up to 28 V
? Increased Precision on Critical Parameters
? ± 1.0 A Peak Drive Capability
? 4.0 ms Soft ? Start
? Internal Thermal Shutdown with Hysteresis
? These Devices are Pb ? Free, Halogen Free/BFR Free
and are RoHS Compliant*
Typical Applications
? ac ? dc Adapters for Notebooks, LCD, and Printers
? Offline Battery Chargers
? Consumer Electronic Power Supplies
? Auxiliary/Housekeeping Power Supplies
*For additional information on our Pb ? Free strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
? Semiconductor Components Industries, LLC, 2011
July, 2011 ? Rev. 3
1
Publication Order Number:
NCP1238/D
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相关代理商/技术参数 |
参数描述 |
|---|---|
| NCP1239 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Low−Standby High Performance PWM Controller |
| NCP1239D | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Low-Standby High Performance PWM Controller |
| NCP1239F | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:AC-DC Offline Switching Controllers/Regulators |
| NCP1239FDR2 | 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 |
| NCP1239FDR2G | 功能描述:电流型 PWM 控制器 Low Standby Power High Performance PWM 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 |
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