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| 型号： | NCP1234BD100R2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 1/33页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR FLYBACK PWM 7SOIC |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 108kHz |
| 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： | 带卷 (TR) |
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NCP1234
Fixed Frequency Current
Mode Controller for Flyback
Converters
The NCP1234 is a new fixed ? frequency current ? mode controller
featuring Dynamic Self ? Supply (DSS). This device is pin ? to ? pin
compatible with the previous NCP12xx families.
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 frequency foldback, the controller exhibits excellent
efficiency in light load condition while still achieving very low
standby power consumption. Internal frequency jittering, ramp
compensation, and a versatile latch input make this controller an
excellent candidate for converters where components cost is the key
constraints.
It features a timer ? based fault detection that ensures the detection of
overload independently of an auxiliary winding, and an adjustable
compensation to help keep the maximum power independent of the
input 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).
Features
? Fixed ? Frequency Current ? Mode Operation with Built ? In Ramp
Compensation
? 65 kHz or 100 kHz Oscillator Frequency version
? Frequency Foldback then Skip Mode for Maximized Performance in
Light Load and Standby Conditions
? Timer ? Based Overload Protection with Latched (option A) or
Auto ? Recovery (option B) Operation
? High ? voltage Current Source with Dynamic Self ? Supply,
Simplifying the Design of the V CC Capacitor
? Frequency Modulation for Softened EMI Signature, including during
Frequency Foldback mode
http://onsemi.com
SOIC ? 7
CASE 751U
MARKING DIAGRAM
8
34Xff
ALYWX
G
1
34Xff = Specific Device Code
X = A or B
ff = 65 or 100
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
G = Pb ? Free Package
PIN CONNECTIONS
Latch 1 8 HV
FB 2
CS 3 6 V CC
GND 4 5 DRV
(Top View)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
?
?
?
?
?
?
?
?
Adjustable Overpower Compensation
Latch ? off Input for Severe Fault Conditions, Allowing Direct
Connection of an NTC for Overtemperature Protection (OTP)
V CC Operation up to 28 V, with Overvoltage Detection
? 500 mA Peak Source/Sink Current Drive Capability
4.0 ms Soft ? Start
Internal Thermal Shutdown
Pin ? to ? Pin Compatible with the Existing NCP12xx
Series
These Devices are Pb ? Free, Halogen Free/BFR Free
and are RoHS Compliant
dimensions section on page 32 of this data sheet.
Typical Applications
? AC ? DC Adapters for Notebooks, LCD, and Printers
? Offline Battery Chargers
? Consumer Electronic Power Supplies
? Auxiliary/Housekeeping Power Supplies
? Semiconductor Components Industries, LLC, 2011
October, 2011 ? Rev. 1
1
Publication Order Number:
NCP1234/D
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相关代理商/技术参数 |
参数描述 |
|---|---|
| NCP1234BD65R2G | 功能描述:电流型 PWM 控制器 Fixed Freq (I) Mode For FlyBk Conv 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 |
| NCP1236 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Fixed Frequency Current Mode Controller for Flyback Converters |
| NCP1236AD100R2G | 功能描述:电流型 PWM 控制器 BRWN LATCH OCP OVP 100KHZ 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 |
| NCP1236AD65R2G | 功能描述:电流型 PWM 控制器 BRWN LATCH OCP OVP 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 |
| NCP1236B65NBGEVB | 制造商:ON Semiconductor 功能描述:PG - ACDC CONVERSION - Bulk |
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