DatasheetsPDF.com

LD7578J Dataheets PDF



Part Number LD7578J
Manufacturers Leadtrend
Logo Leadtrend
Description High Voltage Green-Mode PWM Controller
Datasheet LD7578J DatasheetLD7578J Datasheet (PDF)

LD7578J 03/03/2009 High Voltage Green-Mode PWM Controller with Over Temperature Protection Rev. 00 General Description The LD7578J integrates several functions of protections, and EMI-improved solution in a SOP-8/or DIP-8 package to minimize the component counts and the circuit space. The device provides functions of low startup current, green-mode power-saving operation, leading-edge blanking of the current sensing and internal slope compensation. Also, the LD7578J features more protections .

  LD7578J   LD7578J


Document
LD7578J 03/03/2009 High Voltage Green-Mode PWM Controller with Over Temperature Protection Rev. 00 General Description The LD7578J integrates several functions of protections, and EMI-improved solution in a SOP-8/or DIP-8 package to minimize the component counts and the circuit space. The device provides functions of low startup current, green-mode power-saving operation, leading-edge blanking of the current sensing and internal slope compensation. Also, the LD7578J features more protections like OLP (Over Load Protection), OVP (Over Voltage Protection), and OTP (Over Temperature Protection) to prevent the circuit being damaged under the abnormal conditions. The LD7578J features built-in auto-recovery function for OVP on Vcc pin and OLP. Furthermore, the LD7578J features frequency trembling to depress radiation noise and is an excellent solution for EMI filter design. Features z High-Voltage (500V) Startup Circuit z Current Mode Control z Non-Audible-Noise Green Mode Control z UVLO (Under Voltage Lockout) z LEB (Leading-Edge Blanking) on CS Pin z Internal Frequency Trembling z Internal Slope Compensation z Internal Over Current Protection z OVP (Over Voltage Protection) on Vcc z OLP (Over Load Protection) z External OTP through a NTC z 500mA Driving Capability Applications z Switching AC/DC Adaptor and Battery Charger z Open Frame Switching Power Supply z LCD Monitor/TV Power Typical Application Leadtrend Technology Corporation LD7578J-DS-00 March 2009 1 www.leadtrend.com.tw Pin Configuration SOP-8 & DIP-8 (TOP VIEW) HV NC VCC OUT 8765 TOP MARK YYWWPP 1 234 YY: WW: PP: Year code Week code Production code LD7578J (-) LATCH COMP CS GND Ordering Information Part number LD7578J GS Switching Freq. 65KHz Protection Mode Auto recovery LD7578J GN 65KHz Auto recovery The LD7578J is green packaged. Package SOP-8 DIP-8 Green package Green package Top Mark LD7578J GS LD7578J GN Shipping 2500 /tape & reel 3600 /tube /Carton Pin Descriptions PIN NAME 1 (-) LATCH 2 COMP 3 CS 4 GND 5 OUT 6 VCC 7 NC 8 HV FUNCTION Pull this pin lower than 0.95V to shutdown the controller into latch mode until the AC power-on recycles. By connecting a NTC with this pin to ground, it can achieve the OTP protection function. Keep this pin float to disable the latch protection. Voltage feedback pin. By connecting a photo-coupler to close the control loop, it can achieve the regulation. Current sense pin, for sensing the MOSFET current. Ground. Gate drive output to drive the external MOSFET. Supply voltage pin. Unconnected Pin. Connect this pin to a positive terminal of bulk capacitor to provide the startup current for the controller. When Vcc voltage trips the UVLO(on), this HV loop will be turned off to save the power loss on the startup circuit. Leadtrend Technology Corporation LD7578J-DS-00 March 2009 2 www.leadtrend.com.tw Block Diagram LD7578J Leadtrend Technology Corporation LD7578J-DS-00 March 2009 3 www.leadtrend.com.tw Absolute Maximum Ratings Supply Voltage VCC High-Voltage Pin, HV COMP, (-)LATCH, CS OUT Junction Temperature Operating Ambient Temperature Storage Temperature Range Package Thermal Resistance (SOP-8) Package Thermal Resistance (DIP-8) Power Dissipation (SOP-8, at Ambient Temperature = 85°C) Power Dissipation (DIP-8, at Ambient Temperature = 85°C) Lead temperature (Soldering, 10sec) ESD Voltage Protection, Human Body Model (except HV Pin) ESD Voltage Protection, Machine Model Gate Output Current LD7578J 30V -0.3V~500V -0.3 ~7V -0.3 ~Vcc+0.3 150°C -20°C to 85°C -65°C to 150°C 160°C/W 100°C/W 400mW 650mW 260°C 2.5KV 250V 500mA Caution: Stresses beyond the ratings specified in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Leadtrend Technology Corporation LD7578J-DS-00 March 2009 4 www.leadtrend.com.tw Electrical Characteristics (TA = +25oC unless otherwise stated, VCC=15.0V) PARAMETER CONDITIONS High-Voltage Supply (HV Pin) High-Voltage Current Source Off-State Leakage Current Supply Voltage (Vcc Pin) Startup Current VCC< UVLO(on), HV=500V VCC> UVLO(off), HV=500V Operating Current (with 1nF load on OUT pin) VCOMP=0V, LD7578J VCOMP=3V, LD7578J OLP tripped, LD7578J OVP tripped, LD7578J (-)Latch Pin Tripped LD7578J UVLO (off) UVLO (on) OVP Level Voltage Feedback (COMP Pin) Short Circuit Current Open Loop Voltage VCOMP=0V COMP pin open Green Mode Threshold VCOMP Current Sensing (CS Pin) Maximum Input Voltage,Vcs_off Leading Edge Blanking Time Input impedance VCOMP > 1.9 VCOMP <1.9 Delay to Output LD7578J MIN TYP MAX UNITS 0.5 1.0 1.5 mA 35 μA 320 3.3 3.6 0.78 0.88 μA mA mA mA mA 0.68 mA 9.0 10.0 11.0 V 15.0 16.0 17.0 V 26.5 28.0 29.5 V 1.45 5.6 2.35 2.0 mA V V 0.80 0.85 0.90 V 250 nS 1700 nS 1 MΩ 100 nS Leadtrend Technology Corporation LD7578.


LD7268 LD7578J LD7522H


@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site.
(Privacy Policy & Contact)