Universal-Input/5 W
Flyback Switching Regulator
Data Sheet
28102.24
STR-A6169
Sanken Power Devices
from Allegro MicroSystems
Switching
Regulators
ABSOLUTE MAXIMUM RATINGS
at T
A
= +25C
Control Supply Voltage, V
CC
. . . . 35 V
Drain-Source Voltage, V
DSS . . . . . .
800 V
Drain Switching Current, I
D
. . . . 1.2 A*
Peak Drain Switching Current,
I
DM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 A
Single-Pulse Avalanche Energy,
E
AS
. . . . . . . . . . . . . . . . . . . . . 7 mJ
Start-Up Pin Voltage Range,
V
startup
. . . . . . . . . 0.3 V to +600 V
OCP Voltage Range,
V
OCP
. . . . . . . . . . . . 0.5 V to +6 V
FB/OLP Voltage Range,
V
FB/OLP
. . . . . . . . . . 0.5 V to +10 V
Package Power Dissipation, P
D
control (V
CC
I
CC(ON)
) . . . . . 0.15 W
MOSFET (V
DSS
I
D
) . . . . . . 1.35 W
total . . . . . . . . . . . . . . . . . . . . 1.5 W
MOSFET Channel Temp., T
J
. +150C
Internal Frame Temp., T
F
. . . . +125C
Operating Temperature Range,
T
A
. . . . . . . . . . . -20C to +125C
Storage Temperature Range,
T
S
. . . . . . . . . . . . -40C to +125C
* Drain switching current is limited by temperature
(page 2) and safe operating area (page 4).
For the availability of parts meeting -40C
requirements, contact Allegro's Sales Represen-
tative.
The STR-A6169 is a PRC topology (fixed off-time) regulator
specifically designed to satisfy the requirements for increased integration
and reliability in flyback converters. It incorporates a primary control
and drive circuit with avalanche-rated 800 V power MOSFET.
Covering the power range from below 8 watts for a 230 VAC input,
or 5 watts for a universal (85 to 264 VAC) input, this device can be used
in a range of applications, from DVD and VCR players to ac adapters
for cellular phones and digital cameras. An auto-standby function
reduces power consumption at light load, while multiple protections,
including the avalanche-energy guaranteed MOSFET, provide high
reliability of system design. Devices with an increased output power
rating are the STR-A6151 and STR-A6159.
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. The STR-A6169 is provided in an 8-
pin mini-DIP plastic package.
FEATURES
AND
BENEFITS
Rugged 800 V Avalanche-Rated MOSFET
Simplified Surge Absorption
No V
DSS
Derating Required
19.2
r
DS(on)
Two Operational Modes by Automatic Switching:
PRC Mode for Normal Operation
Burst Mode for Stand-By Operation or Light Loads
Built-In Leading Edge Blanking
Low Start-Up Current
Start-Up Circuit Disabled in Operation
Low Operating Current (1.5 mA typ)
Automatic Burst Stand-By (intermittent operation)
Input Power <0.1 W at No Load
-- continued
Always order by complete part number, e.g., STR-A6169 .
STR-A6169
Universal-Input/5 W
Flyback Switching Regulator
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036
2
Switching
Regulators
Copyright 2005 Allegro MicroSystems, Inc.
FUNCTIONAL BLOCK DIAGRAM
FEATURES
AND
BENEFITS (cont'd)
Auto-Bias Function
Stable Burst Operation Without Generating Interference
Internal Off-Timer Circuit
Built-In Constant-Voltage Drive
Multiple Protections:
Pulse-by-Pulse Overcurrent Protection
Overload Protection with Auto Recovery
Latching Overvoltage Protection
Undervoltage Lockout with Hysteresis
Latching Thermal Shutdown
Molded Small-Size 8-Pin Package
For Low-Height SMPS
Polarized to Prevent Backwards Assembly
STR-A6169
Universal-Input/5 W
Flyback Switching Regulator
www.allegromicro.com
3
Switching
Regulators
ELECTRICAL CHARACTERISTICS
at T
A
= 25C, V
CC
= 20 V (unless otherwise specified).
Pin
Ratings
Characteristic
No.
Symbol
Test Conditions
Min
Typ
Max
Units
Drain-to-Source Breakdown Volt.
8 - 1
V
DSS
I
D
= 300 A,
800
-
-
V
V
1
V
3
= 0 V (short)
Drain Leakage Current
8 - 1
I
DSS
V
DS
= 800 V,
-
-
300
A
V
1
V
3
= 0 V (short)
On-State Resistance
8 - 1
r
DS(on)
I
D
= 0.4 A
-
-
19.2
MOSFET Switching Time
8 - 3
t
f
-
-
-
250
ns
Operation Start Voltage
2 - 3
V
CC(ON)
V
CC
= 0
19.2 V
16
17.5
19.2
V
Operation Stop Voltage
2 - 3
V
CC(OFF)
V
CC
= 19.2
9 V
9.0
10
11
V
Circuit Current in Operation
2 - 3
I
CC(ON)
-
-
-
4.0
mA
Circuit Current in Non-Operation
2 - 3
I
CC(OFF)
V
CC
= 14 V
-
-
50
A
Auto-Bias Threshold Voltage
2 - 3
V
CC(bias)
V
CC
= 20
9.6 V
9.6
10.6
11.6
V
V
CC(bias)
V
CC(OFF)
-
-
-
0.2
0.6
-
V
Maximum OFF Time
8 - 3
t
OFF
-
7.3
8.0
8.7
s
OCP Threshold Voltage
1 - 3
V
OCP
-
0.69
0.77
0.86
V
Leading Edge Blanking Time
8 - 3
t
b
-
200
320
480
ns
Burst Threshold Voltage
4 - 3
V
burst
0.70
0.79
0.88
V
OLP Threshold Voltage
4 - 3
V
OLP
-
6.5
7.2
7.9
V
Current at OLP Operation
4 - 3
I
OLP
-
-18
-26
-35
A
Maximum FB Current
4 - 3
I
FB(MAX)
-
227
300
388
A
Start-Up Current
5 - 3
I
startup
V
CC
= 15 V
340
790
1230
A
Start-Up Circuit Leakage Current
5 - 3
I
start(leak)
-
-
-
30
A
OVP Operation Voltage
2 - 3
V
CC(OVP)
V
CC
= 0
34.1 V
28.7
31.2
34.1
V
OVP/TSD Latch Sustaining Current
2 - 3
I
CC(H)
V
CC
=34.1
8.5 V
-
-
200
A
OVP/TSD Latch Release Voltage
2 - 3
V
CC
V
CC
=34.1
6.6 V
6.6
7.3
8.0
V
Thermal Shutdown
-
T
J
-
135
-
-
C
Thermal Resistance
-
R
JF
-
-
-
52
C/W
WARNING -- These devices are designed to be operated at lethal voltages and energy levels. Circuit designs
that embody these components must conform with applicable safety requirements. Precautions must
be taken to prevent accidental contact with power-line potentials. Do not connect grounded test
equipment.
The use of an isolation transformer is recommended during circuit development and breadboarding.
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