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STR-W6765 Datasheet(PDF) 1 Page - Allegro MicroSystems

Part No. STR-W6765
Description  Quasi-Resonant Topology Primary Switching Regulators
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Maker  ALLEGRO [Allegro MicroSystems]
Homepage  http://www.allegromicro.com
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STR-W6765 Datasheet(HTML) 1 Page - Allegro MicroSystems

 
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STR-W6765
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 ofVDS and turns
on the MOSFET at the second bottom point, to minimize an
increaseofoperationalfrequencyatlightoutputload,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
Quasi-Resonant Topology
Primary Switching Regulators
Typical Application
Package: 6-pin TO-220
Continued on the next page…
28103.30-6
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…
+B
GND
S1
P
D
D
S/GND
VCC
S2
LowB
GND
For ErrAmp, Sanken SE series device recommended
For SI, Sanken linear regulator IC recommended
1
1
3
3
7
7
Cont
STR-W6735
6
6
OCP
/BD
4
4
FB
ROCP
ErrAmp
SS
/OLP
5
5
Standby
ON/OFF
Standby
Out
CX
RX
SI
A
B
B
A


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