STR-Y6735 Datasheet, PDF (1/10 Pages) Allegro MicroSystems – Off-Line Quasi-Resonant Switching Regulator

STR-Y6735
Off-Line Quasi-Resonant Switching Regulator
Features and Benefits
• TO–220F–7L package
• Lead (Pb) free compliance
• The built-in startup circuit reduces the number of external
components and lowers standby power consumption
• Multi-mode control allows high efficiency operation
across the full range of loads
• Auto burst oscillation mode for standby mode, for
improving low standby power at no load: input power
< 30 mW at 100 VAC and < 50 mW at 230 VAC
• Bottom-skip mode minimizes switching loss at medium to
low loads
▪ Internal MOSFET V_DSS(min) is 500 V
▪ Internal MOSFET R_DS(on)(max) 0.8 Ω
• Built-in soft start function reduces stress applied to the
incorporated power MOSFET and peripheral components
• Step-on burst oscillation minimizes transformer
audible noise
• Built-in leading edge blanking (LEB) function eliminates
external filter components
Continued on the next page…
Description
The STR-Y6735 comprises a power MOSFET and a multi-
functional monolithic integrated circuit (MIC) controller
designed for controlling switch mode power supplies. The
quasi-resonant mode of operation, coupled with the bottom-
skip function, allows high efficiency and low noise at low to
high operational levels, while burst oscillation mode ensures
minimum power consumption at standby.
In order to sustain low power consumption under low load
and in standby mode, the controller has built-in startup and
standby circuits. This enables output power up to 120 W with
a 100 VAC input.
The compact 7-pin full mold package (TO220F-7L) reduces
board space by requiring a minimum of external components,
thus simplifying circuit design. This IC, including various
protection functions, is an excellent choice for standardized,
compact power supplies.
Package: 7-Pin TO-220F
STR-Y6735-DS
Not to scale
Typical Application
VAC
C_V
T1
D2
V_OUT
PC1
C1
R4
P
C5
S
R5
Error Amp
D1 R2
1
3
D/ST ^STR-Y6700 VCC
C2
D
DZ_BD
GND
Controller BD
Chip (MIC) 6
FB/
OLP
5
S/OCP NF
2
7
ROCP
GND
4
R3
C3
PC1
C4 ^CBD
R_BD1
R_BD2
The NF pin (No. 7) should be connected
to the GND pin (No. 4), which should be
at a stable ground potential, to ensure
stability of operation.