R7730
R7730 is Burst Triple-Mode PWM Flyback Controller manufactured by Richtek.
Description
The R7730 is a high-performance, low cost, low startup current, current mode PWM controller with burst triplemode to support green mode power saving operation. The R7730 integrates functions of soft-start, Under Vo Itage Lockout (UVLO), Leading Edge Blanking (LEB), Over Temperature Protection (OTP), internal slope pensation. It provides the users a superior AC/DC power application of higher efficiency, low external ponent counts and lower cost solution.
To protect the external power MOSFET from being damaged by supply over voltage, the R7730 output driver is clamped at 12V. Furthermore, R7730 features fruitful protections like OLP (Over Load Protection) ,OVP (Over Voltage Protection) to eliminate the external protection circuits and provide reliable operation. R7730 is available in SOT-23-6 package.
Applications z Adaptor and Battery Charger z ATX Standby Power z Set Top Boxes (STB) z DVD and CD(R) z TV/Monitor Standby Power z PC Peripherals
Typical Application Circuit
Features z Very Low Start-Up Current (<30u A) z 10/14V UVLO z Soft Start Function z Current Mode Control z Internal Leading-Edge Blanking z Built-in Slope pensation z Burst Triple-Mode PWM for Green-Mode z Cycle-by-Cycle Current Limiting z Feedback Open Protection z Output Over Voltage Protection z Over Temperature Protection z Over Load Protection z Soft Driving for Reducing EMI z High Noise Immunity z Opto Coupler Short Protection z Ro HS pliant and Halogne Free
AC Mains (90V to 265V)
VO+ VO-
RT VDD
GATE
DS7730-00 May 2008
.richtek. 1
Preliminary
Ordering Information
Package Type E : SOT-23-6
Operating Temperature Range G : Green (Halogen Free with mer- cial Standard)
Note :
Richtek Green products are : `Ro HS pliant and patible with the current requirements of IPC/JEDEC J-STD-020. `Suitable for use in Sn Pb or Pb-free soldering processes. `100% matte tin (Sn) plating.
Marking Information
For marking information, contact our sales representative...
