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LD7577B

Leadtrend
Part Number LD7577B
Manufacturer Leadtrend
Description High Voltage Green-Mode PWM Controller
Published Oct 20, 2015
Detailed Description LD7577B 7/10/2009 High Voltage Green-Mode PWM Controller with Brown-Out Protection Rev. 00 General Description The LD...
Datasheet PDF File LD7577B PDF File

LD7577B
LD7577B

Overview
LD7577B 7/10/2009 High Voltage Green-Mode PWM Controller with Brown-Out Protection Rev.
00 General Description The LD7577B integrates several functions of protections, and EMI-improved solution in SOP-8/ DIP-8 package.
It minimizes 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, it features more protections like OLP (Over Load Protection), OVP (Over Voltage Protection), and brownout protection to prevent the circuit from being damaged under abnormal conditions.
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 Slope Compensation z OVP (Over Voltage Protection) on Vcc Pin z OLP (Over Load Protection) z Precision Brownout Protection 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 AC input EMI Filter * HV VCC OUT BNO LD7577B CS GND COMP * *See Application Information photocoupler TL431 Leadtrend Technology Corporation LD7560-DS-00 July 2009 1 www.
leadtrend.
com.
tw Pin Configuration LD7577B SOP-8 & DIP-8 (TOP VIEW) HV NC VCC OUT 8 76 5 TOP MARK YYWWPP 1234 YY: WW: PP: Year code Week code Production code BNO COMP CS GND Ordering Information Part number LD7577B GS SOP-8 Package Green package LD7577B GN DIP-8 Green package The LD7577B is ROHS compliant/ green packaged.
Top Mark LD7577BGS LD7577BGN Shipping 2500 /tape & reel 3600 /tube /Carton 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.
If the voltage is less than threshold voltage, the PWM output will be disabled.
Voltage feedback pin.
By connecti...


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