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LD7750A Dataheets PDF



Part Number LD7750A
Manufacturers Leadtrend
Logo Leadtrend
Description High Voltage Green-Mode PWM Controller
Datasheet LD7750A DatasheetLD7750A Datasheet (PDF)

LD7750A 06/25/2010 High Voltage Green-Mode PWM Controller with Over Temperature Protection Rev. 00 General Description The LD7750A integrates several functions of protections, and EMI-improved solution in a tiny 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 LD7750A features more protections like OLP (.

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LD7750A 06/25/2010 High Voltage Green-Mode PWM Controller with Over Temperature Protection Rev. 00 General Description The LD7750A integrates several functions of protections, and EMI-improved solution in a tiny 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 LD7750A features more protections like OLP (Over Load Protection), OVP (Over Voltage Protection), and OTP (Over Temperature Protection) to prevent the circuit being damaged under abnormal conditions. The LD7750A features built-in auto-recovery function for OVP on Vcc pin and OLP. Furthermore, the LD7750A features frequency swapping to depress radiation noise, providing an excellent solution for EMI filter design. Features z High-Voltage (500V) Startup Circuit z Current Mode Control z Green Mode Control z UVLO (Under Voltage Lockout) z LEB (Leading-Edge Blanking) on CS Pin z Internal Frequency swapping 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 LD7750A-DS-00 June 2010 1 www.leadtrend.com.tw Pin Configuration SOP-7 (TOP VIEW) SOP-8/DIP-8 (TOP VIEW) LD7750A HV VCC OUT HV NC VCC OUT 8 65 TOP MARK YYWWPP 1 234 8765 TOP MAR K YYWWPP 1 23 4 YY: WW: PP: Year code Week code Production code OTP COM P CS GND OTP COMP CS GND Ordering Information Part number LD7750A GS Package SOP-8 Green package LD7750A GR SOP-7 Green package LD7750A GN DIP-8 Green package The LD7750A is ROHS compliant. Top Mark LD7750AGS LD7750AGR LD7750AGN Protection Mode Part number LD7750A Switching Freq. 65kHz VCC OVP Latch OLP Auto recovery Shipping 2500 /tape & reel 2500 /tape & reel 3600 /tube /Carton OTP Pin Latch Pin Descriptions SOP-8 SOP-7 11 22 33 44 55 66 7 88 NAME OTP COMP CS GND OUT VCC NC HV FUNCTION Pulling this pin below 0.95V will shutdown the controller to enter latch mode until the AC power-on recycles. Connecting a NTC between this pin and ground will achieve OTP protection function. Let this pin float to disable the latch protection. Voltage feedback pin. Connecting a photo-coupler with it can close control loop and achieve 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 reduce the power loss on the startup circuit. Leadtrend Technology Corporation LD7750A-DS-00 June 2010 2 www.leadtrend.com.tw Block Diagram LD7750A Leadtrend Technology Corporation LD7750A-DS-00 June 2010 3 www.leadtrend.com.tw Absolute Maximum Ratings Supply Voltage VCC High-Voltage Pin, HV COMP,OTP, CS OUT Maximum Junction Temperature Operating Ambient Temperature Operating Junction Temperature Storage Temperature Range Package Thermal Resistance (SOP-7, SOP-8) Package Thermal Resistance (DIP-8) Power Dissipation (SOP-7, 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 LD7750A -0.3V 30V -0.3V~500V -0.3 ~7V -0.3 ~Vcc+0.3 150°C -20°C to 85°C -40°C to 125°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 LD7750A-DS-00 June 2010 4 www.leadtrend.com.tw Electrical Characteristics (TA = +25°C 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 VCOMP=3V, OLP tripped OVP tripped, VCC=OVP 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 Zero Duty Current Sensing (CS Pin) Maximum Input Voltage,Vcs_off Leading Edge Blanking Time Input impedance Delay to Output LD7750A MIN TYP MAX UNITS 0.5 1.0 1.5 mA 35 μA 200 320 400 1.2 2.3 0.61 0.70 9.0 10.0 11.0 15.0 16.0 17.0 25.0 26.0 27.0 μA mA mA mA mA V V V .


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