PWM Controller. R7914 Datasheet

R7914 Controller. Datasheet pdf. Equivalent

R7914 Datasheet
Recommendation R7914 Datasheet
Part R7914
Description Enhanced Burst Triple-Mode PWM Controller
Feature R7914; Preliminary R7914 Enhanced Burst Triple-Mode PWM Controller with Integrated Power MOSFET for Flyba.
Manufacture RICHPOWER
Datasheet
Download R7914 Datasheet




RICHPOWER R7914
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 triple-
mode 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 (<30ยตA)
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



RICHPOWER R7914
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



RICHPOWER R7914
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







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