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RS2042S

更新时间： 2024-11-16 03:35:55
品牌 Logo 应用领域
ORISTER 控制器
页数 文件大小 规格书
8页 233K
描述
Green-Power PWM Controller with Freq,. Jittering

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中文翻译

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RS2042S 数据手册

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RS2042  
Green-Power PWM Controller with Freq. Jittering  
Description  
The RS2042 is a low startup current, low cost, current mode PWM controller with Green-Power & burst-mode power-saving  
operation. The integrated functions such as the leading-edge blanking of the current sensing, internal slope compensation  
provide the users a high efficiency, low external component counts, and low cost solution for AC/DC power applications. The  
special Green-Power function provides off-time modulation to linearly decrease the switching frequency under light-load  
conditions. And under zero-load conditions, the power supply enters burst-mode to further reduce power consumption by  
shutting off PWM output. When the output of power supply is short or over loaded, the FB voltage will increase, and if the FB  
voltage is higher than 5.2V for longer than 56msec the PWM output will be turned off. A external NTC resistor connected from  
pin RT to ground can be applied to over-temperature protection. Pulse by pulse current limit ensures a constant output current  
even under short circuit. PWM output will be disabled as long as VDD exceeds a threshold. When internal latch circuit is used to  
latch-off the controller, the latch will be reset when the power supply VDD is disabled.  
Features  
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Low Cost, Green-Power Burst-Mode PWM  
Very Low Start-up Current (about 7.5μA)  
Low Operating Current (about 3.0mA)  
Current Mode Operation  
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VDD over voltage protect 25.5V  
Cycle-by-cycle current limiting  
Sense Fault Protection  
Output SCP (Short circuit Protection)  
Built-in Synchronized Slope Compensation  
Leading-edge blanking on Sense input  
Programmable PWM Frequency  
High-Voltage CMOS Process with ESD  
DIP-8 & SOP-8 Pb-Free Package  
Compatible with SG6842J&LD7552&OB2269 & SG6841  
& OB2268  
Under Voltage Lockout (UVLO)  
VDD Over Voltage Protection (OVP)  
Programmable over-temperature protection  
Internal Latch Circuit (OTP, OVP)  
Built-in soft start with 1ms  
Built-in Frequency jitter for better EMI Signature  
Soft Clamped gate output voltage 16.5V  
Applications  
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Power Adaptor  
Battery Charger Adapter  
Open Frame Switching Power Supply  
LCD Monitor  
Pin Configurations  
Name  
GND  
FB  
Description  
GND Pin  
Voltage feedback pin. The PWM duty cycle is determined by FB and Sense.  
This pin is pulled high to the rectified line input through a large resistor for start-up.  
This pin is also used to detect line voltage to compensate for constant output  
power limit for universal AC input.  
GATE  
GND  
FB  
1
2
3
4
8
VIN  
VDD  
SENSE  
RT  
By connecting a resistor to ground to set the switching freq.. Increasing the  
resistor will reduce the switching freq..  
7
RI  
An NTC resistor is connected from this pin to ground for over-temperature  
protection.  
VIN  
RI  
6
5
RT  
Current sense pin, The sensed voltage is used for current-mode control and pulse-  
by-pulse current limiting.  
Power supply voltage pin.  
SENSE  
VDD  
Gate drive output to drive the external MOSFET.A soft driving waveform is  
implemented to improve EMI.  
GATE  
DS-RS2042-01 May, 2007  
www.Orister.com  
12345678

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