LD7523 – Smart Green-Mode PWM Controller

Part Number : LD7523

Function : Smart Green-Mode PWM Controller

Manufactures : Leadtrend

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LD7523 image

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Description :

LD7523 6/16/2009 Smart Green-Mode PWM Controller with Multiple Protections REV: 00 General Description The LD7523 is a low startup current, current mode PWM controller with green-mode power-saving operation. The SOP-8/DIP-8 package integrated functions such as the leading- edge blanking of the current sensing, internal slope compensation, line compensation, and several protection features. The protection functions include cycle-by-cycle current limit, OVP, OLP, and brownout protection. It provides the users a high efficiency, low external component counts solution for AC/DC power applications. Furthermore, to satisfy various protection requirements, both latch-mode protection and auto-recoverable protection can be easily achieved by configuring LD7523 on different operation modes. The special green-mode control is not only to achieve the low power consumption operation but also the to offer a is non-audible-noise when LD7523 Features z z z z z z z z z z z z z High-Voltage CMOS Process with Excellent ESD protection Very Low Startup Current (< 35μA) Current Mode Control Non-audible-noise Green Mode Control UVLO (Under Voltage Lockout) LEB (Leading-Edge Blanking) on CS Pin Internal Slope Compensation Programmable Line Compensation OVP (Over Voltage Protection) OLP (Over Load Protection) Brownout Protection Built in OLP De-Latch Timer 500mA Driving Capability Applications z z z Switching AC/DC Adaptor and Battery Charger Open Frame Switching Power Supply LCD Monitor/TV Power operating under light load or no load condition. Typical Application AC input EMI Filter VCC OVP OUT LD7523 CS BNO GND COMP photocoupler TL431 1 Leadtrend Technology Corporation LD7523-DS-00 June 2009 www.leadtrend.com.tw Free Datasheet http:/// LD7523 Pin Configuration SOP-8 & DIP-8(TOP VIEW) GND 5 OVP VCC 7 8 OUT 6 TOP MARK YYWWPP 1 2 3 4 YY : Year code (D: 2004, E: 2005…..) WW : Week code ## : Production code COMP BNO Ordering Information Part number LD7523 GS LD7523 GN SOP-8 DIP-8 Package Green Package Green Package TOP MARK LD7523GS LD7523GN Shipping 2500 /tape & reel 3600/tube /carton The LD7523 is ROHS Complaint/ Green Package. Pin Descriptions PIN NAME FUNCTION Brownout Protection Pin. Connect a resistor divider between this pin and bulk 1 BNO capacitor voltage to set the brownout level and line compensation. When the voltage of this pin fall below threshold voltage, the PWM output will be shut off. 2 3 4 5 6 7 COMP NC CS GND OUT VCC Voltage feedback pin (same as the COMP pin in UC384X). Connect it with a photo-coupler to close the control loop and achieve the regulation. NC Current sense pin, connect to sense the MOSFET current Ground Gate drive output to drive the external MOSFET Supply voltage pin This pin is active-high to provide the OVP function. Connecting a zener or a 8 OVP resistor voltage divider to Vcc will set the OVP level. Once the voltage rise above 2.5V, the OVP will be tripped and the gate drive off. Shor [...]

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LD7523 Datasheet

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