W6765 Datasheet PDF - Allegro MicroSystems
| Part Number | W6765 | |
| Description | STRW6765 | |
| Manufacturers | Allegro MicroSystems | |
| Logo |  |
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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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STR-W6765
www.DataSheet4U.com
Quasi-Resonant Topology
Primary Switching Regulators
ELECTRICAL CHARACTERISTICS
Characteristic
Symbol
Terminals
Min.
Typ.
ELECTRICAL CHARACTERISTICS for Controller (MIC)1, valid at TA = 25°C, VCC = 20 V, unless otherwise specified
Max.
Units
Power Supply Start-up Operation
Operation Start Voltage
Operation Stop Voltage
Circuit Current In Operation
Circuit Current In Non-Operation
Oscillation Frequency
Soft Start Operation Stop Voltage
Soft Start Operation Charging Current
VCC(ON)
VCC(OFF)
ICC(ON)
ICC(OFF)
fosc
VSSOLP(SS)
ISSOLP(SS)
4-3
4-3
4-3
4-3
1-3
5-3
5-3
16.3
8.8
–
–
19
1.1
–710
18.2
9.7
–
–
22
1.2
–550
19.9
10.6
6
100
25
1.4
–390
V
V
mA
μA
kHz
V
μA
Normal Operation
Bottom-Skip Operation Threshold Voltage 1
Bottom-Skip Operation Threshold Voltage 2
Overcurrent Detection Threshold Voltage
OCP/BDOCP/BD Terminal Outflow Current
Quasi-Resonant Operation Threshold Voltage 1
Quasi-Resonant Operation Threshold Voltage 2
FB Terminal Threshold Voltage
FB Terminal Inflow Current (Normal Operation)
VOCPBD(BS1)
VOCPBD(BS2)
VOCPBD(LIM)
IOCPBD
VOCPBD(TH1)
VOCPBD(TH2)
VFB(OFF)
IFB(ON)
7-3
7-3
7-3
7-3
7-3
7-3
6-3
6-3
–0.720
–0.485
–0.995
–250
0.28
0.67
1.32
600
–0.665
–0.435
–0.940
–100
0.40
0.80
1.45
1000
–0.605
–0.385
–0.895
–40
0.52
0.93
1.58
1400
V
V
V
μA
V
V
V
μA
Standby Operation
Standby Operation Start Voltage
Standby Operation Start Voltage Interval
Standby Non-Operation Circuit Current
FB Terminal Inflow Current, Standby Operation
FB Terminal Threshold Voltage, Standby Operation
Minimum On Time
Maximum On Time
VCC(S)
VCC(SK)
ICC(S)
IFB(S)
VFB(S)
tON(MIN)
tON(MAX)
4-3
4-3
4-3
6-3
6-3
1-3
1-3
10.3 11.1 12.1
1.10 1.35 1.65
– 20 56
– 4 14
0.55 1.10 1.50
0.40 0.82 1.25
27.5 32.5 39.0
V
V
μA
μA
V
μs
μs
Protection Operation
Overload Protection Operation Threshold Voltage
VSSOLP(OLP)
5-3
Overload Protection Operation Charging Current
ISSOLP(OLP)
5-3
Overvoltage Protection Operation Voltage
VCC(OVP)
4-3
Latch Circuit Holding Current2
ICC(H)
4-3
Latch Circuit Release Voltage2
VCC(La.OFF)
4-3
ELECTRICAL CHARACTERISTICS for MOSFET, valid at TA = 25°C, unless otherwise specified
Drain-to-Source Breakdown Voltage
VDSS
1-3
Drain Leakage Current
IDSS
1-3
On Resistance
RDS(on)
1-3
Switching Time
tf 1 - 3
Thermal Resistance
RθJA
Junction to Internal
Frame
4.0
–16
25.5
–
6.0
800
–
–
–
–
4.9
–11
27.7
45
7.2
–
–
–
–
–
5.8 V
–6 μA
29.9 V
140 μA
8.5 V
–V
300 μA
1.8 Ω
400 ns
1.55 °C/W
1Current polarity with respect to the IC: positive current indicates current sink at the terminal named, negative current indicates source at the
terminal named.
2Latch circuit refers to operation during Overload Protection or Overvoltage Protection.
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
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