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R7914 Dataheets PDF



Part Number R7914
Manufacturers RICHPOWER
Logo RICHPOWER
Description Enhanced Burst Triple-Mode PWM Controller
Datasheet R7914 DatasheetR7914 Datasheet (PDF)

Preliminary R7914 Enhanced Burst Triple-Mode PWM Controller with Integrated Power MOSFET for Flyback Converts General Description Features The R7914 series consists of a high voltage power MOSFET and a high-performance, low cost, low start-up current and current mode PWM controller with burst triplemode to support green mode power saving operation. The R7914 integrates functions of soft start, Under VoItage LockOut (UVLO), Leading Edge Blanking (LEB), Over Temperature Protection (OTP) and i.

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Preliminary R7914 Enhanced Burst Triple-Mode PWM Controller with Integrated Power MOSFET for Flyback Converts General Description Features The R7914 series consists of a high voltage power MOSFET and a high-performance, low cost, low start-up current and current mode PWM controller with burst triplemode to support green mode power saving operation. The R7914 integrates functions of soft start, Under VoItage LockOut (UVLO), Leading Edge Blanking (LEB), Over Temperature Protection (OTP) and internal slope compensation. It provides the users a superior AC/DC power application of higher efficiency, low external component counts and lower cost solution. To protect the internal power MOSFET from being damaged by supply over voltage, the R7914 driver is clamped at 12V. Furthermore, R7914 features fruitful protections like Over Load Protection (OLP) and Over Voltage Protection (OVP) to eliminate the external protection circuits and provide reliable operation. R7914 is available in DIP-8 package. Integrated 650V Power MOSFET Very Low Start-up Current (<30µA) 10/14V UVLO Soft Start Function Current Mode Control Jittering Switching Frequency Internal Leading Edge Blanking Built-in Slope Compensation Burst Triple-Mode PWM for Green-Mode Cycle-by-Cycle Current Limit Feedback Open Protection Over Voltage Protection Output Temperature Protection Over Load Protection Soft Driving for Reducing EMI High Noise Immunity Opto-Coupler Short Protection RoHS Compliant and Halogen Free Ordering Information R7914 Package Type N : DIP-8 Operating Temperature Range G : Green (Halogen Free with Commer- cial Standard) Applications Adaptor ATX Standby Power Set-Top Box (STB) DVD and CD(R) TV/Monitor Standby Power PC Peripherals Note : Richpower Green products are : RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020. Suitable for use in SnPb or Pb-free soldering processes. Marking Information For marking information, contact our sales representative directly or through a Richpower distributor located in your area, otherwise visit our website for detail. Pin Configurations (TOP VIEW) DRAIN DRAIN GND GND 87 65 2 34 CS VDD COMP RT DIP-8 R7914-04P Mar 2010 1 R7914 Typical Application Circuit Preliminary AC Mains (90V to 265V) OPTO 4 R7914 VDD 2 RT 3 COMP 5 GND 6 GND 7 DRAIN 8 DRAIN 1 CS OPTO # See Application Information # VO+ VO- Pin Description Pin No. 1 2 3 4 5 6 7 8 Pin Name CS VDD COMP RT GND GND DRAIN DRAIN Pin Description Current sensing pin. Power supply pin. Voltage feedback pin. By connecting an opto-couple to close control loop and achieve the regulation. Set the switching frequency by connecting a resistor to GND. Ground. Ground. MOSFET Drain. MOSFET Drain. 2 R7914-04P Mar 2010 Block Diagram Preliminary R7914 COMP 3 Brownout Sensing OLP COMP Open Sensing Constant Power LEB X3 Shutdown Logic Counter OTP OVP + - 27V POR UVLO + - 10/14V Oscillator Bias & Bandgap SS Slope Ramp Dmax + PWM Comparator S Q R Burst Triple Mode& TP Compensation Soft Driver COMP VBURH VBURL VDD 2 VDD 4 RT 7 DRAIN 8 DRAIN 1 CS 5 GND 6 GND R7914-04P Mar 2010 3 R7914 Preliminary Absolute Maximum Ratings (Note 1) Supply Input Voltage, VDD ----------------------------------------------------------------------------------------- −0.3V to 30V DRAIN Pin ------------------------------------------------------------------------------------------------------------- 650V RT, COMP, CS Pin -------------------------------------------------------------------------------------------------- −0.3V to 6.5V IDD ----------------------------------------------------------------------------------------------------------------------- 10mA Power Dissipation, PD @ TA = 25°C DIP-8 ------------------------------------------------------------------------------------------------------------------- 1.053W Package Thermal Resistance (Junction to Ambient θJA ) DIP-8, θJA (Note 2) ------------------------------------------------------------------------------------------------ 95°C/W Junction Temperature ----------------------------------------------------------------------------------------------- 150°C Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------- 260°C Storage Temperature Range --------------------------------------------------------------------------------------- −65°C to 150°C ESD Susceptibility (Note 3) HBM (Human Body Mode) ----------------------------------------------------------------------------------------- 3kV MM (Machine Mode) ------------------------------------------------------------------------------------------------ 250V Recommended Operating Conditions (Note 4) Supply Input Voltage, VDD ----------------------------------------------------------------------------------------- 12V to 23V Operating Frequency ------------------------------------------------------------------------------------------------ 50k to 130kHz Jun.


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