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A6051M Datasheet PDF - Allegro MicroSystems

Part Number A6051M
Description STR-A6051M
Manufacturers Allegro MicroSystems 
Logo Allegro MicroSystems Logo 



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A6051M datasheet, circuit
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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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A6051M equivalent
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STR-A60xxM
Current Mode Control PWM Regulator IC
For Switching Power Supplies
Electrical Characteristics1 Valid at VCC = 18 V, TA = 25°C, unless otherwise specified
Characteristic
Symbol Terminal Min. Typ. Max.
Operation Start Voltage
Operation Stop Voltage2
Circuit Current in Operation
Minimum Startup Voltage
Startup Current
Startup Current Supply Threshold Voltage2
Average Switching Frequency
Switching Frequency Variance Range
VCC(ON)
VCC(OFF)
ICC(ON)
VST(ON)
ISTARTUP
VCC(BIAS)
fOSC(av)
f
5–3
5–3
5–3
5–3
5–3
5–3
8–3
8–3
13.8
7.3
–3.7
8.5
60
15.3
8.1
38
–2.5
9.5
67
5
16.8
8.9
2.5
–1.5
10.5
74
Maximum Duty Cycle
DMAX
8–3
77
83
89
Minimum On-Time
tON(MIN)
– 540
Leading Edge Blanking Time
tBW – – 340 –
OCP Compensation Coefficient
DPC
22
Maximum Duty Cycle for OCP Compensation
DDPC
36
OCP Threshold Voltage at Zero Duty Cycle
VOCP(L)
1–3
0.70
0.78
0.86
OCP Threshold Voltage at 36% Duty Cycle
VOCP(H)
1–3
0.81
0.9
0.99
Maximum Feedback Current
IFB(MAX)
4–3
–340
–230
–150
Minimum Feedback Current
IFB(MIN)
4–3
–30
–15
–7
Oscillation Stop FB/OLP Voltage
VFB(OFF)
4–3
0.85
0.95
1.05
OLP Threshold Voltage
VFB(OLP)
4–3
7.3
8.1
8.9
OLP Delay Time
tOLP 4 – 3
54
68
82
Operation Current After OLP
ICC(OLP)
5–3
300 600
FB/OLP Terminal Clamp Voltage
VFB(CLAMP)
4–3
11
12.8
14
Brown-In Threshold Voltage
VBR(IN)
2–3
5.2
5.6
6
Brown-Out Threshold Voltage
VBR(OUT)
2–3
4.45
4.8
5.15
BR Terminal Clamp Voltage
VBR(CLAMP)
2–3
6
6.4
7
BR Function Disabling Threshold
VBR(DIS)
2–3
0.3
0.48
0.7
OVP Threshold Voltage
VCC(OVP)
5–3
26
29
32
Latch Circuits Sustaining Current3
ICC(LATCH)
5–3
700
Thermal Shutdown Operating Temperature
TJ(TSD)
5–3
135
1Current characteristics are defined based on IC as sink ( +), or source ( –).
2VCC(BIAS) > VCC(OFF).
3A latch circuit is a circuit operated with Overvoltage Protection (OVP) and/or Thermal Shutdown Protection (TSD) in operation.
Unit
V
V
mA
V
mA
V
kHz
kHz
%
ns
ns
mV/μs
%
V
V
μA
μA
V
V
ms
μA
V
V
V
V
V
V
μA
°C
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
5
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Information Total 15 Pages
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