STR-X6737 Allegro Microsystems Inc, STR-X6737 Datasheet - Page 2

• Manufacturer Part Number: STR-X6737
• Description: SMPS Primary Switcher, (Bottom Skip Quosi-resonance Switching Type)
• Manufacturer: Allegro Microsystems Inc

STR-X6737
Selection Guide
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.
Applications include the following:
▪ Set Top Box
▪ LCD PC monitor, LCD TV
▪ Printer, Scanner
▪ SMPS power supplies
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, T
Absolute Maximum Ratings
Drain Current
Maximum Switching Current
Single Pulse Avalanche Energy
Input Voltage for Controller (MIC)
SS/OLP Terminal Voltage
FB Terminal Inflow Current
FB Terminal Voltage
OCP/BD Terminal Voltage
MOSFET Power Dissipation
Controller (MIC) Power Dissipation
Operating Internal Leadframe Temperature
Operating Ambient Temperature
Storage Temperature
Channel Temperature
1
2
3
4
Description (continued)
Refer to MOSFET ASO curve
I
Refer to Avalanche Energy Derating curve
Refer to MOSFET Ta-PD1 curve
DMAX
is the drain current determined by the drive voltage of the IC and the threshold voltage, V
Part Number
STR-X6737
1
Parameter
A
, of 25°C, unless oth er wise stated.
4
2
3
at T
A
= 25°C
Off-Line Quasi-Resonant Switching Regulators
Symbol
V
I
V
Package
D
I
OCPBD
V
Dmax
E
SSOLP
V
P
P
T
peak
T
T
TO-3P
I
T
FB
CC
OP
stg
AS
FB
D1
D2
ch
F
115 Northeast Cutoff
1.508.853.5000; www.allegromicro.com
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 U.S.A.
Single pulse
T
Single pulse, V
I
With infinite heatsink
Without heatsink
V
Recommended operation temperature, see cautions
FB
A
CC
= –20°C to 125°C
within the limits of I
× I
CC
DD
= 30 V, L = 50 mH, I
FB
Conditions
Lpeak
th
, of the MOSFET
= 3.0 A
–0.5 to 6.0
–0.5 to 9.0
–1.5 to 5.0
–20 to 125
–20 to 125
–40 to 125
Rating
239
150
2.8
0.8
22
22
35
10
44
Unit
mA
mJ
°C
°C
°C
°C
W
W
W
V
V
V
V
A
A
2