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Allegro MicroSystems - STRW6765

Numéro de référence W6765
Description STRW6765
Fabricant Allegro MicroSystems 
Logo Allegro MicroSystems 





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W6765 fiche technique
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STR-W6765
Quasi-Resonant Topology
Primary Switching Regulators
Features and Benefits
Quasi-resonant topology IC Low EMI noise and soft
switching
Bottom-skip operation Improved system efficiency
over the entire output load by avoiding increase of
switching frequency
Standby burst mode operation Lowers input power at
very light output load condition
Avalanche-guaranteed MOSFET Improves system-
level reliability and does not require VDSS derating
800 V / 1.8 Ω, 52 to 110 W (Universal/230 Vac input)
Continued on the next page…
Package: 6-pin TO-220
Description
The STR-W6765 is a quasi-resonant topology IC designed for
SMPS applications. It shows lower EMI noise characteristics
than conventional PWM solutions, especially at greater than
2 MHz. It also provides a soft-switching operation to turn on the
internal MOSFET at close to zero voltage (VDS bottom point)
by use of the resonant characteristic of primary inductance
and a resonant capacitor.
The package is a fully molded TO-220, which contains the
controller chip (MIC) and MOSFET, enabling output power up
to 52 W with universal input or 110 W with a 230 Vac input.
The bottom-skip function skips the first bottom of VDS and turns
on the MOSFET at the second bottom point, to minimize an
increase of operational frequency at light output load, improving
system-level efficiency over the entire load range.
There are two standby functions available to reduce the input
power under very light load conditions.The first is an auto-burst
mode operation that is internally triggered by periodic sensing,
and the other is a manual standby mode, which is executed
by clamping the secondary output. In general applications,
the manual standby mode reduces the input power further
compared to the auto-burst mode.
The soft-start function minimizes surge voltage and reduces
power stress to the MOSFET and to the secondary rectifying
Continued on the next page…
Typical Application
28103.30-6
D VCC
14
STR-W6735
3
S/GND
ROCP
Cont
7
OCP
/BD
6
FB
5
SS
/OLP
RX
CX
P S1
+B
ErrAmp A
D
S2
B SI
GND
Standby
ON/OFF
LowB
Standby
Out
GND
A For ErrAmp, Sanken SE series device recommended
B For SI, Sanken linear regulator IC recommended

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