ng rs
i
ch to
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Sw egu
R
STR-A6251
AND
STR-A6252
Universal-Input/15 W 50 kHz
Flyback Switching Regulators
The STR-A6251 and STR-A6252 are 50 kHz PWM topology (with
鹵5% frequency jittering for minimum EMI) regulators specifically
designed to satisfy the requirements for increased integration and
reliability in flyback converters. They incorporate a primary control and
drive circuit with avalanche-rated power MOSFETs. The STR-A6252
features higher allowable switching current and lower on-resistance.
The STR-A6251 is also available for 67 kHz operation.
Covering the power range from below 21 watts or 24 watts for a
230 VAC input, or to 15 or 20 watts for a universal (85 to 264 VAC)
input, these devices 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. Both devices are provided in an 8-pin
mini-DIP plastic package with pin 6 removed.
FEATURES
AND
BENEFITS
鈻?/div>
50 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>
Choice of
r
DS(on)
(2.8
惟
or 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)
continued
Always order by complete part number, e.g.,
STR-A6251
.
Data Sheet
28103.42b
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
STR-A6251 . . . . . . . . . . . . . .
2.5 A*
STR-A6252 . . . . . . . . . . . . . .
3.0 A*
Peak Drain Switching Current, I
DM
STR-A6251 . . . . . . . . . . . . . . .
2.5 A
STR-A6252 . . . . . . . . . . . . . . .
3.0 A
Single-Pulse Avalanche Energy, E
AS
STR-A6251 . . . . . . . . . . . . . .
72 mJ
STR-A6252 . . . . . . . . . . . . .
123 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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