STR-W6700
■
General Descriptions
Series
Power IC for Quasi-Resonant Type Switching Power Supply
with High Efficiency and Low Noise in Full Load Range
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
TO-220F-6
optimal high efficiency and low noise power supply systems across the full load range.
(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
V
DSS
M
IN
(V)
R
DS
(
ON
)
MAX
Burst-
Oscillation
Bottom-
Skip QR
Product No.
( )
MOSFET
V
DSS
M
IN
(V)
R
DS
(
ON
)
MAX
Burst-
Oscillation
Bottom-
Skip QR
( )
STR-W6723N
STR-W6734
STR-W6735
STR-W6735N
STR-W6753
STR-W6754
450
500
500
500
650
650
1.4
1.0
0.57
0.57
1.7
0.96
N
Y
Y
N
Y
Y
Y
Y
Y
Y
Y
Y
STR-W6750F
STR-W6756
STR-W6756N
STR-W6765
STR-W6765N
650
650
650
800
800
0.73
0.73
0.73
1.8
1.8
Y
Y
N
Y
N
N
Y
Y
Y
Y
Y: Including the function
N: Excluding the function
2010/08
SANKEN [ SANKEN ELECTRIC ]
