STR-X6700 Datasheet, PDF (1/2 Pages) Sanken electric – Power IC for Quasi-Resonant Type Switching Power Supply with High Efficiency

STR-X6700 Series
Power IC for Quasi-Resonant Type Switching Power Supply
with High Efficiency and Low Noise in Full Load Range
■ General Descriptions
The STR-X6700 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-W6700 series products are the different package (TO-220F) versions.
■ Features
Multi-Mode Control
The operation mode switching with three steps according to load conditions achieves the
TO-3PF-7
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 low 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-X6729
450
STR-X6737
500
STR-X6737M 500
STR-X6756
650
STR-X6757
650
STR-X6757N 650
STR-X6750B
650
Y: Including the function
RDS(ON)
MAX
(Ω)
Burst-
Bottom-
Oscillation Skip QR
0.189
N
Y
0.36
Y
Y
0.36
N
Y
0.73
Y
Y
0.62
Y
Y
0.62
N
Y
0.62
N
Y
N: Excluding the function
Product No.
STR-X6750F
STR-X6759N
STR-X6759F
STR-X6759B
STR-X6768N
STR-X6769
STR-X6769B
MOSFET
VDSS MIN
(V)
650
650
650
650
800
800
800
RDS(ON)
MAX
(Ω)
0.62
0.385
0.385
0.385
1.0
0.66
0.66
Burst-
Oscillation
Y
N
Y
N
N
Y
N
Bottom-
Skip QR
N
Y
N
N
Y
Y
N