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STR-A6251M
Universal-Input/15 W
67 kHz Flyback Switching Regulator
The STR-A6251M is a 67 kHz PWM topology (with 鹵5% fre-
quency jittering for minimum EMI) regulator specifically designed to
satisfy the requirements for increased integration and reliability in
flyback converters. It incorporates a primary control and drive circuit
with an avalanche-rated power MOSFET. This is a higher-frequency
version of the STR-A6251.
Covering the power range from below 21 watts for a 230 VAC
input, or to 15 watts for a universal (85 to 264 VAC) input, this device
can be used in a wide range of applications, from DVD players and
VCR player/recorders to ac adapters for cellular phones and digital
cameras. An auto-burst standby function reduces power consumption at
light load, while multiple protections, including the avalanche-energy
guaranteed MOSFET, provide high reliability of system design.
Cycle-by-cycle current limiting, undervoltage lockout with hyster-
esis, overvoltage protection, and thermal shutdown protect the power
supply during the normal overload and fault conditions. Overvoltage
protection and thermal shutdown are 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. It is provided in an 8-pin mini-DIP
plastic package with pin 6 removed.
FEATURES
AND
BENEFITS
鈻?/div>
67 kHz PWM with 鹵5% Frequency Jittering
Cost Reduction of EMI Noise Filtering
鈻?/div>
Rugged 650 V Avalanche-Rated MOSFET
Simplified Surge Absorption
No V
DSS
Derating Required
鈻?/div>
Low
r
DS(on)
(3.95
惟
maximum)
鈻?/div>
Auto-Burst Mode for Stand-By Operation or Light Loads
Less Transformer Audible Noise
鈻?/div>
Built-In Leading Edge Blanking
鈻?/div>
Soft Start and Low Start-Up Current
Start-Up Circuit Disabled in Operation
鈻?/div>
Low Operating Current (4 mA max)
鈻?/div>
Automatic Burst Stand-By (intermittent operation)
Input Power <0.1 W at No Load
continued
Always order by complete part number, e.g.,
STR-A6251M
.
Data Sheet
28103.43b
ABSOLUTE MAXIMUM RATINGS
at T
A
= +25擄C
Control Supply Voltage, V
CC
. . . .
36 V
Drain-Source Voltage, V
DSS . . . . . .
650 V
Drain Switching Current, I
D
. . . .
2.5 A*
Peak Drain Switching Current,
I
DM
. . . . . . . . . . . . . . . . . . . . . .
2.5 A
Single-Pulse Avalanche Energy,
E
AS
. . . . . . . . . . . . . . . . . . . .
72 mJ
S/OCP Voltage Range,
V
OCP
. . . . . . . . . . . .
鈥?.3 V to +6 V
FB/CC/OLP Voltage Range,
V
FB/OLP
. . . . . . . . . .
鈥?.3 V to +12 V
FM Voltage Range,
V
FM
. . . . . . . . . . . . .
鈥?.3 V to +6 V
Package Power Dissipation, P
D
control (V
CC
脳 I
CC(ON)
) . . . . .
0.15 W
MOSFET (V
DSS
脳 I
D
) . . . . . .
1.35 W
total . . . . . . . . . . . . . . . . . . . .
1.5 W
MOSFET Channel Temp., T
J
.
+150擄C
Internal Frame Temp., T
F
. . . .
+125擄C
Storage Temperature Range,
T
S
. . . . . . . . . . . .
-40擄C to +125擄C
* Drain switching current is limited by tem-
perature (page 2) and safe operating area
(page 4).
Sanken Power Devices
from Allegro MicroSystems
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