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STR-W6754
Universal-Input/100 W Off-Line Quasi-
Resonant Flyback Switching Regulator
The STR-W6754 is a quasi-resonant regulator specifically designed
to satisfy the requirements for increased integration and reliability in
switch-mode power supplies. It incorporates a primary control and drive
circuit with an avalanche-rated power MOSFET. The regulator exhibits
only low-level high-frequency EMI noise because of soft switching of
the MOSFET close to ground (bottom point). A bottom-skip function
minimizes an increase of operational frequency during light loads to
improve system efficiency over the entire load range.
Covering the power range from below 160 watts for a 230 VAC
input, or 100 watts for a universal input (85 to 264 VAC), this device
can be used in a range of applications, from DVD and VCR players to
ac adapters for cellular phones and digital cameras. An auto-standby
function, which is internally triggered by sensing on time, reduces
power consumption at light load. An externally triggered standby mode
reduces the input power further. Multiple protections, including the
avalanche-energy-guaranteed MOSFET, provide high reliability of
system design. Devices with an increased output power rating are the
STR-W6756.
Cycle-by-cycle current limiting, undervoltage lockout with hyster-
esis, and overvoltage protection protect the power supply during the
normal overload and fault conditions. Overvoltage protection is latched
after a short delay. The latch may be reset by cycling the input supply.
Low start-up current and a low-power standby mode selected from the
secondary circuit completes a comprehensive suite of features. The
STR-W6754 is provided in a fully molded TO-220-style flange-
mounted, high power, isolated plastic package.
FEATURES
AND
BENEFITS
■
Rugged 650 V Avalanche-Rated MOSFET
Simplified Surge Absorption
No V
DSS
Derating Required
■
0.96
Ω
Maximum
r
DS(on)
■
Two Operational Modes by Automatic Switching:
Quasi-Resonant Mode for Normal Operation
Burst Mode for Standby Operation or Light Loads
■
Automatic or Manually Triggered Burst Standby
Input Power <0.1 W at No Load
■
Low Operating Current (6 mA typ)
— continued
Always order by complete part number, e.g.,
STR-W6754
.
Data Sheet
28103.32*
ABSOLUTE MAXIMUM RATINGS
at T
A
= +25°C
Control Supply Voltage, V
CC
. . . .
35 V
Drain-Source Voltage, V
DSS . . . . . .
650 V
Drain Switching Current, I
D
. . . . .
15 A*
Peak Drain Switching Current,
I
DM
. . . . . . . . . . . . . . . . . . . . . .
15 A
Single-Pulse Avalanche Energy,
E
AS
. . . . . . . . . . . . . . . . . . .
292 mJ
OCP/BD Voltage Range,
V
OCP
. . . . . . . . . . . .
–1.5 V to +5 V
FB Input Current, I
FB
. . . . . . . .
10 mA
FB Voltage Range, V
FP
–0.5 V to +9 V
Package Power Dissipation, P
D
control (V
CC
× I
CC(ON)
) . . . . . .
0.8 W
MOSFET (V
DSS
× I
D
) . . .
See Graph
MOSFET Channel Temp., T
J
.
+150°C
Internal Frame Temp., T
F
. . . .
+115°C
Operating Temperature Range,
T
A
. . . . . . . . . . . .
-20°C to +115°C
Storage Temperature Range,
T
S
. . . . . . . . . . . .
-40°C to +125°C
* Drain switching current is limited by tem-
perature (page 2) and safe operating area
(page 5).
†For the availability of parts meeting -40°C
requirements, contact Allegro’s Sales Represen-
tative.
Sanken Power Devices
from Allegro MicroSystems
STR-W6754
Universal-Input/100 W Off-Line Quasi-
Resonant Flyback Switching Regulator
FUNCTIONAL BLOCK DIAGRAM
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FEATURES
AND
BENEFITS (cont’d)
■
Auto-Bias Function
Stable Burst Operation Without Generating Interference
■
Internal Off-Timer Circuit
■
Built-In Constant-Voltage Drive
■
Multiple Protections:
Pulse-by-Pulse Overcurrent Protection
Overload Protection with Auto Recovery
Latching Overvoltage Protection
Undervoltage Lockout with Hysteresis
■
RoHS Compliant
2
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036
Copyright © 2005 Allegro MicroSystems, Inc.
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STR-W6754
Universal-Input/100 W Off-Line Quasi-
Resonant Flyback Switching Regulator
ELECTRICAL CHARACTERISTICS at T
A
= +25°C, V
CC
= 20 V, voltage measurements are referenced to S/GND terminal
(unless otherwise specified).
Limits
Characteristic
Start-Up Operation
Operation Start Voltage
Soft-Start Operation Stop Voltage
Soft-Start Oper. Charging Current
Operation Stop Voltage
Circuit Current in Non-Operation
Normal Operation
Drain-Source Breakdown Voltage
Drain Leakage Current
On-State Resistance
Switching Time
Circuit Current
Oscillation Frequency
Bottom-Skip Oper. Threshold Volt.
V
(BR)DSS
I
DSS
I
D
= 300 µA
V
DS
= 650 V
I
D
= 1.9 A, T
J
= +25°C
650
–
–
–
–
19
-605
-385
280
670
1.32
600
–
–
–
–
–
22
-665
-435
400
800
1.45
1000
–
300
0.96
400
6.0
25
-720
-485
520
930
1.58
1400
V
µA
Ω
ns
mA
kHz
mV
mV
mV
mV
V
µA
V
CC(ON)
V
SS/OLP
I
SS/OLP
V
CC(OFF)
I
CC(OFF)
Turn-off, V
CC
= 19.9
V
CC
= 15 V
8.8 V
Turn-on, V
CC
= 0
19.9 V
16.3
1.1
-390
8.8
–
18.2
1.2
-550
9.7
–
19.9
1.4
-710
10.6
100
V
V
µA
V
µA
Symbol
Test Conditions
Min.
Typ.
Max.
Units
r
DS(on)
t
f
I
CC(ON)
f
osc
V
OCPBD(BS1)
V
OCPBD(BS2)
Quasi-Resonant Oper. Threshold
V
OCPBD(TH1)
V
OCPBD(TH2)
Feedback-Pin Threshold Voltage
Feedback-Pin Current
Standby Operation
Standby Operation Start Voltage
Standby Oper. Start Volt. Interval
Standby Non-Operation Current
Feedback-Pin Current
Feedback-Pin Threshold Voltage
Minimum ON Time
V
FB(OFF)
I
FB(ON)
V
CC(S)
V
CC
I
CC(S)
I
FB(ON)
V
FB(S)
t
on(min)
V
CC
= 0
12.2 V
10.3
1.10
11.1
1.35
20
4.0
1.10
0.8
12.1
1.65
56
14
1.50
1.2
V
V
µA
µA
V
µs
V
CC
= 10.2 V
V
CC
= 10.2 V
V
CC
= 12.2 V
–
–
0.55
0.5
continued next page ...
www.allegromicro.com
3
STR-W6754
Universal-Input/100 W Off-Line Quasi-
Resonant Flyback Switching Regulator
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Limits
ELECTRICAL CHARACTERISTICS at T
A
= +25°C, V
CC
= 20 V, voltage measurements are referenced to S/GND terminal
(unless otherwise specified).
Characteristic
Protection Operation
OVP Operation Voltage
Maximum ON Time
OLP Operation Voltage
OLP Operation Current
Overcurrent Detect. Threshold Volt.
OCP/BD-Pin Current
Latch Holding Current
Latch Release Voltage
Other
Thermal Resistance
Symbol
Test Conditions
Min.
Typ.
Max.
Units
V
CC(OVP)
t
on(max)
V
SSOLP
I
SSOLP
V
OCPBD(LIM)
I
OCPBD
I
CC(H)
V
CC(L)
Turn-off, V
CC
= 0
29.9 V
25.5
27.5
4.0
-6.0
27.7
32.5
4.9
-11
29.9
39.0
5.8
-16
V
µs
V
µA
V
µA
mA
V
-0.895 -0.940 -0.995
-40
V
CC
= 29.9
V
CC
= 29.9
V
CC(OFF)
– 0.3 V
6V
–
6.0
-100
45
7.2
-250
140
8.5
R
θJF
Output junction-to-frame
–
–
1.6
°C/W
NOTES: 1. Typical Data is for design information only.
2. Negative current is defined as coming out of (sourcing) the specified device termninal.
4
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Worcester, Massachusetts 01615-0036
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