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LD7531 Datasheet(PDF) 1 Page - Leadtrend Technology |
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LD7531 Datasheet(HTML) 1 Page - Leadtrend Technology |
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1 / 18 page  LD7531 6/25/2008 1 Leadtrend Technology Corporation www.leadtrend.com.tw LD7531-DS-00 June 2008 Green-Mode PWM Controller with Frequency Trembling and Integrated Protections REV: 00 General Description The LD7531 is built-in with several functions, protection and EMI-improved solution in a SOT-26/ DIP-8 package. It takes less components counts or circuit space, especially ideal for those total solutions of low cost. The implemented functions include low startup current, green-mode power-saving operation, leading-edge blanking of the current sensing and internal slope compensation. And the LD7531 features more protections like OLP (Over Load Protection) and OVP (Over Voltage Protection) to prevent the circuit damage from the abnormal conditions. Furthermore, the frequency trembling function is to reduce the noise level and thus helps the power circuit designers to easily deal with the EMI filter design by using minimum component cost and developing time. Features High-Voltage CMOS Process with Excellent ESD protection Very Low Startup Current (<20 μA) Current Mode Control Non-audible-noise Green Mode Control UVLO (Under Voltage Lockout) LEB (Leading-Edge Blanking) on CS Pin Programmable Switching Frequency Internal Trembling ( ±4KHz) Internal Slope Compensation OVP (Over Voltage Protection) on Vcc Pin OLP (Over Load Protection) 300mA Driving Capability Applications Switching AC/DC Adaptor and Battery Charger Open Frame Switching Power Supply Typical Application FM OSC 16.0V /10.0V UVLO Divider 32V Control Logic EMI Filter RT 100K Ohm OUT CS VCC GND COMP LD7531 photocoupler AC input TL431 |
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