LD7577JA – High Voltage Green-Mode PWM Controller

Part Number : LD7577JA

Function : High Voltage Green-Mode PWM Controller

Manufactures : Leadtrend

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LD7577JA image

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Description :

LD7577JA 8/16/2010 High Voltage Green-Mode PWM Controller with Brown-Out Protection Rev. 00b General Description The LD7577JA integrated several functions of protections, and EMI-improved solution in a SOP-7, SOP-8/or DIP-8 package. It minimizes the component counts and the circuit space, and it’s perfect for the low cost of applications. It provides functions of low startup current, green-mode power-saving operation, leading-edge blanking of the current sensing and internal slope compensation. Also, the LD7577JA features more protections like OLP (Over Load Protection), OVP (Over Voltage Protection), and brownout protection to prevent the circuit being damaged from the abnormal conditions. Furthermore, the LD7577JA features frequency trembling to suppress the noise and is an excellent solution for EMI filter design. Features z z z z z z z z z z z z z High-Voltage (500V) Startup Circuit Current Mode Control Non-Audible-Noise Green Mode Control UVLO (Under Voltage Lockout) LEB (Leading-Edge Blanking) on CS Pin Internal Frequency Trembling Internal Slope Compensation Internal Over Current compensation OVP (Over Voltage Protection) on Vcc AC Input OVP (Over Voltage Protection) OLP (Over Load Protection) Brownout Protection 500mA Driving Capability Applications z z z Switching AC/DC Adaptor and Battery Charger Open Frame Switching Power Supply LCD Monitor/TV Power Typical Application AC input EMI Filter – HV VCC OUT LD7577JA BNO GND CS COMP – photocoupler TL431 *See Application Information 1 Leadtrend Technology Corporation LD7577JA-DS-00b August 2010 www.leadtrend.com.tw Free Datasheet http:/// LD7577JA Pin Configuration SOP-8 & DIP-8 (TOP VIEW) VCC OUT NC HV SOP-7 (TOP VIEW) VCC 6 8 7 6 5 8 OUT 5 HV TOP MARK YYWWPP 1 2 3 4 1 TOP MARK YYWWPP 2 3 4 YY: WW: PP: Year code Week code Production code COMP BNO CS COMP Ordering Information Part number LD7577JA GR LD7577JA GS LD7577JA GN Switching Freq. 65KHz 65KHz 65KHz Package SOP-7 SOP-8 DIP-8 Top Mark LD7577JAGS LD7577JAGS LD7577JAGN Shipping 2500 /tape & reel 2500 /tape & reel 3600 /tube /Carton Note: The LD7577JA is Green packaged. Pin Descriptions SOP-8 DIP-8 SOP-7 NAME FUNCTION Brownout Protection Pin. Connect a resistor divider between this pin and bulk capacitor voltage to set the brownout level. If the voltage is below 1 1 BNO threshold voltage, the PWM output will be disabled. The BNO pin also provides AC over voltage protection. As soon as the voltage is over 4.16V, the OVP will be tripped and the gate drive will be turned off. 2 3 4 5 6 7 2 3 4 5 6 –COMP CS GND OUT VCC NC Voltage feedback pin. Through the connection of a photo-coupler, it can close the control loop and achieve the regulation. Current sense pin. Connect it to sense the MOSFET current. Ground. Gate drive output to drive the external MOSFET. Supply voltage pin. Unconnected Pin. Connect this pin to positive terminal of bulk capacitor to provide the startup 8 8 HV current for […]

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LD7577JA Datasheet

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