STR-W6700 Datasheet, PDF (1/2 Pages) Sanken electric – Power IC for Quasi-Resonant Type Switching Power Supply with High Efficiency

STR-W6700 Series
Power IC for Quasi-Resonant Type Switching Power Supply
with High Efficiency and Low Noise in Full Load Range
■ General Descriptions
The STR-W6700 series products are power ICs for quasi-resonant type switching power
supplies, incorporating a power MOSFET and a controller IC, The product achieves high
efficiency and low noise power supply systems by the quasi-resonant operation and the
bottom-skip quasi-resonant operation.
The STR-X6700 series products are the different package (TO-3PF) versions.
■ Features
Multi-Mode Control
The operation mode switching with three steps according to load conditions achieves the
optimal high efficiency and low noise power supply systems across the full load range.
TO-220F-6
(The confirmation of product number is necessary because some functions are different
in each product.)
・In Standby (Under Standby Load Conditions):
－UVLO Intermittent Oscillation by lowering output voltage --- Switched by Standby Signal, or
－Auto Burst-Oscillation --- Switched Automatically
・Under Low to Middle Load Conditions: Bottom-Skip Quasi-Resonant Operation (Bottom-Skip QR)
・Under Middle to Rating (or Heavy) Load Conditions: Quasi-Resonant Operation (QR)
Current-Mode Control
Built-in PWM Oscillator
The PWM operates with the minimum frequency of around 22 kHz, until the quasi-resonant signal becomes
valid, reduces the stress on components at startup and load-shorted.
Soft-Start Function
Step-Drive Function, reducing switching noise
Built-in Maximum ON Time Limitation Circuit
The function limits the maximum ON time of power MOSFET, during the transitions at low input voltage,
power ON/OFF.
Input Compensation at Overcurrent
The function reduces the distortion of overcurrent operation point to AC input voltage change by adding three
components.
Built-in Avalanche Energy Guaranteed High-Voltage Power MOSFET
Various Protections
Overcurrent Protection (OCP) -------------------------------- Pulse-by-Pulse
Overload Protection (OLP)-------------------------------------- Latch Shutdown
Overvoltage Protection (OVP) -------------------------------- Latch Shutdown
■ Applications
Switching Power Supplies for
Digital Consumer Equipment; LCD-TVs, PDP-TVs, CRT-TVs, etc., Home Appliances, OA Equipments,
Industry Machines, Communication Devices, Others
■ Product Lineup
Product No.
MOSFET
VDSS MIN
(V)
STR-W6723N 450
STR-W6734
500
STR-W6735
500
STR-W6735N 500
STR-W6753
650
STR-W6754
650
Y: Including the function
RDS(ON)
MAX
(Ω)
Burst-
Bottom-
Oscillation Skip QR
1.4
N
Y
1.0
Y
Y
0.57
Y
Y
0.57
N
Y
1.7
Y
Y
0.96
Y
Y
N: Excluding the function
Product No.
MOSFET
VDSS MIN
(V)
STR-W6750F 650
STR-W6756
650
STR-W6756N 650
STR-W6765
800
STR-W6765N 800
RDS(ON)
MAX
(Ω)
0.73
0.73
0.73
1.8
1.8
Burst-
Oscillation
Y
Y
N
Y
N
Bottom-
Skip QR
N
Y
Y
Y
Y
2010/08