Document
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
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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.