STRA6051M Datasheet PDF - Allegro MicroSystems

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STRA6051M
Allegro MicroSystems

Part Number STRA6051M
Description Current Mode Control PWM Regulator IC
Page 15 Pages


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STR-A60xxM
Current Mode Control PWM Regulator IC
For Switching Power Supplies
Features and Benefits
Small DIP8 package with 8 to 24 W power output 230 VAC
Current Mode PWM control with 67 kHz switching
frequency
Built-in Random Switching function, reducing EMI noise,
and simplifying EMI filters, and therefore reducing cost
Built-in Slope Compensation function, avoiding
subharmonic oscillation
Built-in Auto Standby function (Input Power, PIN < 25 mW
at no load)
Normal operation: PWM mode
Light load operation: Standby mode (burst oscillation)
Built-in Audible Noise Suppression function during
Standby mode
Built-in Startup Circuit, reducing power consumption in
standby operation, and eliminating external components.
Bias-Assist function, improving startup operation,
suppressing VCC voltage drop in operation, and allowing
use of smaller VCC capacitor
Continued on the next page…
Package: 8-pin DIP
Not to scale
Description
The STR-A60xxM series are power ICs for switching power
supplies, incorporating a power MOSFET and a current mode
PWM controller IC. Including a startup circuit and a standby
function in the controller, the product achieves low power
consumption, low standby power, and high cost-effectiveness
power supply systems with few external components.
The STR-A60xxM internal MOSFET has a VDSS of
650 V(min) or 800 V(min), and an RDS(on) of 1.9 to 19.2 Ω
with a frequency of 67 kHz. Power output is rated at
8 to 24 W at 230 VAC input and 5 to 20 W at wide input range
(85 to 265 VAC).
The device is provided in an industry-standard DIP-8 package,
with pin 6 removed for increased isolation.
Applications:
For switching power supplies used in:
• Battery chargers for cell phones, digital cameras,
video cameras, shavers, emergency lights
• Stand-by power for LCD TVs, desktop PCs, LB Printers,
audio equipment
• Small switched-mode power supplies for inkjet printers,
DVD/CD players, set-top boxes
• Auxiliary power supplies for A/C, refrigerators, washers,
dish washers, and other white goods
Typical Application
VIN(AC)
87
D/ST D/ST
5
VCC
STR-A6000
S/OCP BR GND FB/OLP
1234
OUT
GND
STRA60XXM-DS
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STR-A60xxM
Current Mode Control PWM Regulator IC
For Switching Power Supplies
Features and Benefits (continued)
Built-in Leading Edge Blanking function
Overcurrent Protection function (OCP): pulse-by-pulse built-in
Built-in High Speed Latch Release function, releasing the latch compensation circuit to minimize OCP point variation on AC
shutdown immediately at turning off AC supply
input voltage
Two-chip structure, with a controller and a power MOSFET with Overload Protection function (OLP): auto-restart, built-in
guaranteed avalanche energy available to simplify surge absorber
circuits
timer, reduces heat during overload condition, and no external
Protection functions:
components required
Brown-In and Brown-Out Protection function: auto-restart,
Overvoltage Protection function (OVP): latched shutdown
prevention of excess input current and heat rise at low input Thermal Shutdown Protection function (TSD): shutdown
voltage
latches device off to prevent continuous oscillation
Selection Guide
Part Number
fOSC
(kHz)
MOSFET
VDSS(min)
(V)
RDS(on)
(max)
(Ω)
POUT*
(W)
230 V Wide
Package
Packing
STR-A6051M
3.95 16 12
STR-A6052M
STR-A6053M
67
650
2.8 20 16
DIP8 with pin 6 removed
50 pieces per tube
1.9 24 20
STR-A6079M
800 19.2 8 5
* The listed output power is based on the package thermal ratings, and the peak output power can be 120% to 140% of the
value stated here. At low output voltage and short duty cycle, the output power may be less than the value stated here.
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
2
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STR-A60xxM
Current Mode Control PWM Regulator IC
For Switching Power Supplies
Absolute Maximum Ratings1 Valid at TA = 25°C, unless otherwise specified
Characteristic
Symbol
Notes
Terminals
STR-A6051M 8 – 1
Drain Current2
IDpeak
Single pulse
STR-A6052M
STR-A6053M
8–1
8–1
STR-A6079M 8 – 1
STR-A6051M 8 – 1
EAS
Single pulse, VDD = 99 V,
L = 20 mH
STR-A6052M
STR-A6053M
8–1
8–1
Single Pulse Avalanche Energy3
STR-A6079M
STR-A6051M
8–1
8–1
ILpeak
Single pulse, VDD = 99 V,
L = 20 mH
STR-A6052M
STR-A6053M
8–1
8–1
STR-A6079M 8 – 1
S/OCP Terminal Voltage
VOCP
Controller IC (MIC) Supply Input Voltage
VCC
FB/OLP Terminal Voltage
VFB
FB/OLP Terminal Sink Current
IFB
BR Terminal Voltage
VBR
BR Terminal Sink Current
IBR
MOSFET Power Dissipation4
PD1 Mounted on a 15 mm × 15 mm PCB
Controller IC (MIC) Power Dissipation
PD2
Operating Ambient Temperature
TOP
Maximum recommended internal leadframe
temperature, TF(max) = 115°C
Storage Temperature
Tstg
Channel Temperature
Tch
1Current characteristics are defined based on IC as sink ( +), or source ( –).
2Refer to MOSFET Safe Operating Area Curve.
3Refer to MOSFET Avalanche Energy Derating Coefficient Curve.
4Refer to MOSFET Temperature versus Power Dissipation Curve.
1–3
5–3
4–3
4–3
2–3
2–3
8–1
5–3
Rating
2.5
3.0
4.0
1.2
47
62
86
7
2.0
2.3
2.7
1.2
–2 to 6
32
–0.3 to 14
1.0
–0.3 to 7
1.0
1.35
1.2
–20 to 125
–40 to 125
150
Unit
A
A
A
A
mJ
mJ
mJ
mJ
A
A
A
A
V
V
V
mA
V
mA
W
W
°C
°C
°C
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
3
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STR-A60xxM
Current Mode Control PWM Regulator IC
For Switching Power Supplies
Functional Block Diagram
VCC
5
UVLO
REG
VREG
Startup
D/S T
7,8
Overvoltage
Thermal
Protection (OVP) Shutdown (TSD)
BR
2
Brown-In/
Brown-Out
6.4 V
PWM OSC
SQ
R
OCP
DRV
7 V VCC
OLP
Drain Peak Current
Compe nsa tion
FB/OLP
4
12.8 V
Slope
Compensation
Fe edback
Control
LEB
1
S/OCP
GND 3
Pin-out Diagram
S/OCP 1
BR 2
GND 3
FB/OLP 4
8 D/ST
7 D/ST
5 VCC
Terminal List Table
Number Name
Function
1 S/OCP MOSFET source, and input for Overcurrent Protection detection signal
2 BR Input for Brown-In and Brown-Out Protection detection voltage
3 GND Ground
4 FB/OLP Input for constant voltage control signal, and input for Overload Protection signal
5
VCC
Input for power supply for control circuit
6 – (Pin removed)
7, 8 D/ST MOSFET drain, and input for startup current
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
4
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