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STRX6729 Datasheet Preview

STRX6729 Datasheet

Off-Line Quasi-Resonant Switching Regulators

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STRX6729 pdf
STR-X6729
Off-Line Quasi-Resonant Switching Regulators
Features and Benefits
Quasi-resonant topology IC Low EMI noise and soft
switching
Bottom-skip mode Improved system efficiency over
the entire output load by avoiding increase of switching
frequency
Standby mode Lowers input power at very light output
load condition
Avalanche-guaranteed MOSFET Improves system-level
reliability and does not require VDSS derating
450 VDSS / 0.189 Ω RDS(on)
Various protections Improved system-level reliability
Pulse-by-pulse drain overcurrent limiting
Overvoltage Protection (bias winding voltage sensing),
with latch
Overload Protection with latch
Maximum on-time limit
Package: 7-Pin TO-3P
Not to scale
Description
The STR-X6729 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 mode 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-3P, which contains the
controller chip (MIC) and MOSFET, enabling output power
up to 460 W at 120 VAC input. The bottom-skip mode skips
the first bottom of VDS and turns on the MOSFET at the second
bottom point, to minimize an increase of operating frequency
at light output load, improving system-level efficiency over
the entire load range.
Astandby mode is executed by clamping the secondary output.
In general applications, standby mode reduces input power.
The soft-start mode minimizes surge voltage and reduces power
stress to the MOSFET and to the secondary rectifying diodes
during the start-up sequence.
Various protections such as overvoltage, overload, overcurrent,
maximum on-time protections and avalanche-energy guaranteed
MOSFET secure good system-level reliability.
Continued on the next page…
Typical Application
28103.30-8
www.irantk.ir



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STRX6729 Datasheet Preview

STRX6729 Datasheet

Off-Line Quasi-Resonant Switching Regulators

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STRX6729 pdf
STR-X6729
Off-Line Quasi-Resonant Switching Regulators
Description (continued)
Applications include the following:
Set Top Box
LCD PC monitor, LCD TV
Printer, Scanner
SMPS power supplies
Selection Guide
Part Number
STR-X6729
Package
TO-3P
Absolute Maximum Ratings at TA = 25°C
Parameter
Symbol
Conditions
Drain Current1
IDpeak Single pulse
Maximum Switching Current2
Single Pulse Avalanche Energy3
IDmax
EAS
TA = –20°C to 125°C
Single pulse, VDD = 30 V, L = 50 mH, ILpeak = 4.2 A
Input Voltage for Controller (MIC)
VCC
SS/OLP Terminal Voltage
VSSOLP
FB Terminal Inflow Current
FB Terminal Voltage
IFB
VFB IFB within the limits of IFB
OCP/BD Terminal Voltage
VOCPBD
MOSFET Power Dissipation4
PD1
With infinite heatsink
Without heatsink
Controller (MIC) Power Dissipation
Operating Internal Leadframe Temperature
PD2 VCC × ICC
TF Recommended operation temperature, see cautions
Operating Ambient Temperature
TOP
Storage Temperature
Tstg
Channel Temperature
1Refer to MOSFET ASO curve
Tch
2IDMAX is the drain current determined by the drive voltage of the IC and the threshold voltage, Vth, of the MOSFET
3Refer to Avalanche Energy Derating curve
4Refer to MOSFET Ta-PD1 curve
Rating
22
22
472
35
–0.5 to 6.0
10
–0.5 to 9.0
–1.5 to 5.0
46
2.8
0.8
–20 to 125
–20 to 125
–40 to 125
150
Unit
A
A
mJ
V
V
mA
V
V
W
W
W
°C
°C
°C
°C
All performance characteristics given are typical values for circuit or
system baseline design only and are at the nominal operating voltage and
an ambient temperature, TA, of 25°C, unless otherwise stated.
www.irantk.ir
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
2


Part Number STRX6729
Description Off-Line Quasi-Resonant Switching Regulators
Maker Sanken
Total Page 24 Pages
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