STR-W6735 반도체 회로 부품 판매점
Quasi-Resonant Topology Primary Switching Regulators
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 Allegro MicroSystems |
STR-W6735
Quasi-Resonant Topology
Primary Switching Regulators
Features and Benefits
Description
▪ 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
▪ 500 V / 0.57 Ω, 160 W (120 Vac input)
Continued on the next page…
The STR-W6735 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 160 W with a 120 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.
Package: 6-pin TO-220
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 manualwww.DataSheet4U.com 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
28103.30-5
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
STR-W6735
Features and Benefits (continued)
▪ 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
Selection Guide
Part Number
STR-W6735
Package
TO-220
Quasi-Resonant Topology
Primary Switching Regulators
Description (continued)
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.
Applications include the following:
▪ Set Top Box
▪ LCD PC monitor, LCD TV
▪ Printer, Scanner
▪ SMPS power supplies
Packing
Bulk, 100 pieces
Absolute Maximum Ratings at TA = 25°C
Parameter
Symbol Terminal
Conditions
Rating
Drain Current1
Maximum Switching Current2
Single Pulse Avalanche Energy3
Input Voltage for Controller (MIC)
SS/OLP Terminal Voltage
FB Terminal Inflow Current
FB Terminal Voltage
OCP/BD Terminal Voltage
MOSFET Power Dissipation4
IDpeak
IDmax
EAS
VCC
VSSOLP
IFB
VFB
VOCPBD
PD1
1-3
1-3
1-3
4-3
5-3
6-3
6-3
7-3
1-3
Single pulse
TA = –20°C to 125°C
Single pulse, VDD = 99 V, L = 20 mH,
ILpeak = 5.8 A
IFB within the limits of IFB
With infinite heatsink
Without heatsink
20
20
380
35
–0.5 to 6.0
10
–0.5 to 9.0
–1.5 to 5.0
28.7
1.3
Controller (MIC) Power Dissipation
Operating Internal Leadframe Temperature
Operating Ambient Temperature
Storage Temperature
Junction Temperature
1Refer to figure 2
PD2
TF
TOP
Tstg
TJ
4-3
–
–
–
–
VCC × ICC
Refer to TOP
0.8
–20 to 115
–20 to 115
–40 to 125
150
2IDMAX is the drain current determined by the drive voltage of the IC and the threshold voltage, Vth, of the MOSFET
3Refer to figure 3
4Refer to figure 5
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 of +25°C, unless otherwise stated.
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
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제조업체: Allegro MicroSystems
( allegro )
STR-W6735 regulator
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국내 전력반도체 판매점
상호 : 아이지 인터내셔날
전화번호 : 051-319-2877
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IGBT, TR 모듈, SCR, 다이오드모듈, 각종 전력 휴즈
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