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STR-A6252 Datasheet Download - Allegro MicroSystems

Номер произв STR-A6252
Описание (STR-A6251/-A6252) Universal-Input/15 W 50 kHz Flyback Switching Regulators
Производители Allegro MicroSystems
логотип Allegro MicroSystems логотип 



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STR-A6252 Даташит, Описание, Даташиты
SwRitecghuinlagtors
ABSOLUTE MAXIMUM RATINGS
at TA = +25°C
Control Supply Voltage, VCC . . . . 36 V
Drain-Source Voltage, VDSS . . . . . . 650 V
Drain Switching Current, ID
STR-A6251 . . . . . . . . . . . . . . 2.5 A*
STR-A6252 . . . . . . . . . . . . . . 3.0 A*
Peak Drain Switching Current, IDM
STR-A6251 . . . . . . . . . . . . . . . 2.5 A
STR-A6252 . . . . . . . . . . . . . . . 3.0 A
Single-Pulse Avalanche Energy, EAS
STR-A6251 . . . . . . . . . . . . . . 72 mJ
STR-A6252 . . . . . . . . . . . . . 123 mJ
S/OCP Voltage Range,
VOCP . . . . . . . . . . . . –0.3 V to +6 V
FB/CC/OLP Voltage Range,
VFB/OLP . . . . . . . . . . –0.3 V to +12 V
FM Voltage Range,
VFM . . . . . . . . . . . . . –0.3 V to +6 V
Package Power Dissipation, PD
control (VCC × ICC(ON)) . . . . . 0.15 W
MOSFET (VDSS × ID) . . . . . . 1.35 W
total . . . . . . . . . . . . . . . . . . . . 1.5 W
MOSFET Channel Temp., TJ . +150°C
Internal Frame Temp., TF . . . . +125°C
Storage Temperature Range,
TS . . . . . . . . . . . . -40°C to +125°C
* Drain switching current is limited by tem-
perature (page 2) and safe operating area
(page 4).
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
±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.
wCwwy.DcatalSeh-eebt4yU.-cocmycle 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
50 kHz PWM with ±5% Frequency Jittering
Cost Reduction of EMI Noise Filtering
Rugged 650 V Avalanche-Rated MOSFET
Simplified Surge Absorption
No VDSS Derating Required
Choice of rDS(on) (2.8 Ω or 3.95 Ω maximum)
Auto-Burst Mode for Stand-By Operation or Light Loads
Less Transformer Audible Noise
Built-In Leading Edge Blanking
Soft Start and Low Start-Up Current
Start-Up Circuit Disabled in Operation
Low Operating Current (4 mA max)
continued
Always order by complete part number, e.g., STR-A6251 .
Sanken Power Devices
from Allegro MicroSystems







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STR-A6252 Даташит, Описание, Даташиты
STR-A6251 and STR-A6252
Universal-Input/15 W 50 kHz
Flyback Switching Regulators
FUNCTIONAL BLOCK DIAGRAM
SwRitecghuinlagtors
FEATURES AND BENEFITS (cont’d)
Automatic Burst Stand-By (intermittent operation)
Input Power <0.1 W at No Load
Auto-Bias Function
Stable Burst Operation Without Generating Interference
Internal Off-Timer Circuit
Built-In Constant-Voltage/Constant Current
Multiple Protections:
Pulse-by-Pulse Overcurrent Protection (OCP)
Overload Protection (OLP) with Auto Restart
Latching Overvoltage Protection (OVP)
Undervoltage Lockout (UVLO) with Hysteresis
Latching Thermal Shutdown (TSD)
Molded Small-Size 8-Pin Package
For Low-Height SMPS
This data sheet is based on Sanken data sheet SSE-23297 and SSE-23298.
115 Northeast Cutoff, Box 15036
2 Worcester, Massachusetts 01615-0036
Copyright © 2005 Allegro MicroSystems, Inc.







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STR-A6252 Даташит, Описание, Даташиты
SwRitecghuinlagtors
STR-A6251 and STR-A6252
Universal-Input/15 W 50 kHz
Flyback Switching Regulators
ELECTRICAL CHARACTERISTICS at TA = 25°C, VCC = 18 V (unless otherwise specified).
Pin Ratings
Characteristic
No. Symbol Test Conditions
Min Typ Max Units
Drain-to-Source Breakdown Volt.
8 - 1 V(BR)DSS
ID = 300 µA,
V1 – V3 = 0 V (short)
650 -
-V
Drain Leakage Current
On-State Resistance
8 IDSS
8 - 1 rDS(on)
VDS = 650 V,
V1 – V3 = 0 V (short)
STR-A6251, ID = 0.4 A
STR-A6252, ID = 0.4 A
-
-
-
- 300 µA
- 3.95 Ω
- 2.8 Ω
MOSFET Switching Time
Operation-Start Voltage
Operation-Stop Voltage
8-3
5-3
5-3
tf
VCC(ON)
VCC(OFF)
-
VCC = 0 t 15.7 V
VCC = 15.7 t 9 V
-
12.9
9.0
-
14.3
10
250
15.7
11
ns
V
V
Maximum Switching Frequency
Frequency-Jitter Deviation
Maximum ON Duty Cycle
8-3
8-3
8-3
fosc(max)
Δfosc
D max
-
-
-
45 50 55 kHz
3.0 5.0 7.0 kHz
70 76 82 %
Circuit Current in Operation
5
ICC(ON)
-
- - 4.0 mA
Circuit Current in Non-Operation
5 ICC(OFF) VCC = 12 V
- 14 25 µA
FM Voltage
2 - 3 VFMH
fosc = fosc(max)
4.0 4.5 5.0 V
VFML
fosc < fosc(max)
3.2 3.6 4.0 V
FM Current
OCP Threshold Voltage
Leading Edge Blanking Time
2
1-3
8-3
IFMH
IFML
VOCP
tbw
-
-
-7.7
7.7
0.67
220
-11.0
11.0
0.74
320
-14.3
14.3
0.81
420
µA
µA
V
ns
Burst Threshold Voltage
4 - 3 Vburst
-
1.00 1.12 1.24 V
OLP Threshold Voltage
4 - 3 VOLP
-
7.3 8.6 9.9 V
Current at OLP Operation
4
IOLP
-
-12 -17 -22 µA
OLP Delay Time
Maximum FB Current
CC Set Voltage
CC Reset Voltage
4-3
4
4-3
4-3
tOLP
IFB(MAX)
VSET(CC)
VRES(CC)
-
-
-
VCC = 25 V
0.84
220
4.9
3.5
1.20
310
5.8
3.9
1.56
400
6.7
4.3
s
µA
V
V
Start-Up Current
OVP Operation Voltage
OVP/TSD Latch Sustaining Current
OVP/TSD Latch Release Voltage
Thermal Shutdown
Thermal Resistance
5
5-3
5
5-3
-
-
Istartup
VCC(OVP)
ICC(H)
VCC
TJ
RθJF
VCC = 13 V
VCC = 18 t 35.2 V
VCC =35.2 t 8.6 V
VCC =35.2 t 5.9 V
-
-
0.77
28.8
-
5.9
125
-
1.10
32.0
-
7.2
140
-
1.43
35.2
270
8.6
-
52
mA
V
µA
V
°C
°C/W
Typical values are given for circuit design information only.
Negative current is defined as coming out of (sourcing) the specified terminal.
www.allegromicro.com
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