STR-G6551资料

The STR-G6651 is specifically designed to satisfy the requirements for increased integration and reliability in off-line quasi-resonant flyback converters. This device incorporates the primary control and drive circuit with a discrete avalanche-rated power MOSFET.

Cycle-by-cycle current limiting, under-voltage lockout with hyster-esis, over-voltage protection, and thermal shutdown protects the power supply during the normal overload and fault conditions. Over-voltage protection and thermal shutdown are latched after a short delay. The latch may be reset by cycling the input supply. Low-current startup and a low-power standby mode selected from the secondary circuit completes a comprehensive suite of features. The device is provided in a five-pin over-molded TO-220 style package, affording dielectric isolation without compromising thermal characteristics. Two lead forms are available (with and without the suffix ‘-LF’) to accommodate printed wiring board layout or mechanical constraints.

Proven in substantial volumes, the STR-G6651 is a robust low-risk solution for off-line power supplies particularly where management of EMI at the source is a significant element of the system design.

FEATURES

I Quasi-Resonant Operation I Output Power to 66 W

I Low-Loss, Pulse-Ratio-Control Standby Mode

I Temperature-Compensated Pulse-by-Pulse Over-Current Protection I Latched Over-Voltage and Thermal Protection I Under-Voltage Lockout with Hysteresis

I Active Low-Pass Filter for Enhanced Light-Load Stability I Switched Attenuation of Leading-Edge Current-Sensing Signal I Regulated Soft Gate Drive

I Adjustable Switching Speed for EMI Control I Overmolded Five-Pin Package

OFF-LINE QUASI-RESONANT FLYBACK SWITCHING REGULATOR

Always order by complete part number: STR-G6651 .

Data Sheet

28102.9A

™

STR-G6651

查询STR-G6622供应商

STR-G6651OFF-LINE

QUASI-RESONANT FLYBACK SWITCHING REGULATOR

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

™

Copyright © 1999, 2000 Allegro MicroSystems, Inc.

FUNCTIONAL BLOCK DIAGRAM

FEEDBACK &OVER-CURRENT PROTECTION

GROUND

V

SOURCE

DRAIN Dwg. FK-002-5

4

12

53

ALLOWABLE PACKAGE POWER DISSIPATION

MAXIMUM SAFE OPERATING AREA

2010

20

60100140

TEMPERATURE in °C

A L L O W A

B L E P A

C K A G E P O W E R

D I S S I P A T I O N i n W A T T S

Dwg. GK-003-4

50

5

0.5

0.05

DRAIN-SOURCE VOLTAGE in VOLTS

D R A I N C U R R

E N T i n A M P E R E S

Dwg. GK-004-5

0.15

1.5

15

STR-G6651OFF-LINE

QUASI-RESONANT FLYBACK

SWITCHING REGULATOR

www.allegromicro.com

ELECTRICAL CHARACTERISTICS at T A = +25°C, V IN = 18 V, V DD = 10 V, V S = 0, voltage mea-surements are referenced to ground terminal (unless otherwise specified).

Limits

Characteristic Symbol Test Conditions Min.Typ.Max.Units On-State Voltage V INT Turn-on, increasing V IN 14.41617.6V Under-Voltage Lockout V INQ Turn-off, decreasing V IN 9.01011V Over-Voltage Threshold

V OVP(th)Turn-off, increasing V IN 20.522.524.5V Drain-Source Breakdown Voltage V (BR)DSS I D = 300 µA 650––V Drain Leakage Current I DSS V DS = 650 V

––300µA On-State Resistance r DS(on)V S = 10 V, I D = 0.9 A, T J = +25°C –– 3.95ΩMaximum OFF Time

t off Drain waveform high 45–55µs Minimum Pulse Duration for Input of Quasi-Resonant Signals t w(th)Drain waveform high 1–– 1.0µs Minimum OFF Time

t off Drain waveform high 1

–– 1.5µs Feedback Threshold Voltage

V FDBK

Drain waveform low to high 10.680.730.78V Oscillation synchronized 2

1.3 1.45 1.6V Over-Current Protection/Feedback Sink Current

I OCP/FB V OCP/FB = 1.0 V

1.2 1.35 1.5mA Latch Holding Current I IN(OVP)V IN reduced from 24.5 V to 8.5 V ––400mA Latch Release Voltage V IN I IN ≤ 20 µA, V IN reduced from 24.5 V 6.6–8.4V Switching Time t f V DD = 200 V, I D = 0.9 A ––250ns Supply Current

I IN(ON)Operating 3

––30mA I IN(OFF)

Increasing V IN prior to oscillation ––100µA Insulation RMS Voltage V WM(RMS)

All terminals simultaneous refer-2000––V ence metal plate against backside

Thermal Shutdown T J 140––°C Thermal Resistance

R θJM

Output junction-to-mounting frame –

–

1.63

°C/W

Notes:Typical Data is for design information only.

1. Feedback is square wave, V IM =

2.2 V, t h = 1 µs, t l = 35 µs

2. For quasi-resonant operation, the input signal must be longer than t w(th) and greater than V FDBK

3. Feedback is square wave, V IM = 2.2 V, t h = 4 µs, t l = 1 µs

STR-G6651OFF-LINE

QUASI-RESONANT FLYBACK SWITCHING REGULATOR

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

™

ALLOWABLE AVALANCHE ENERGY

200

100

60100

140

50

STARTING CHANNEL TEMPERATURE in °C

A L L O W A

B L E A V A L A N

C H E E N E R G Y i n m J

Dwg. GK-009-2

150

0204080120160

STR-G6600 Series

Drain-Source Drain-Source

Output Breakdown Voltage ON Resistance

at I D = 300 µA at I D = 0.9 A Part Number V (BR)DS , Minimum r DS(on), Maximum

Output Power

For 100/120 V AC Input

STR-G6622450 V 2.18 Ω44 W – 60 W STR-G6624450 V 0.92 Ω

98 W – 130 W

For 110/120 V AC Input

STR-G6632500 V 2.62 Ω

36 W – 50 W For 200/220 V AC Input

STR-G6651650 V 3.95 Ω66 W STR-G6652650 V 2.80 Ω86 W STR-G6653

650 V

1.95 Ω

120 W

STR-G6651OFF-LINE

QUASI-RESONANT FLYBACK

SWITCHING REGULATOR

www.allegromicro.com

TYPICAL QUASI-RESONANT FLYBACK CONVERSION USING STR-G6651

WARNING: lethal potentials are present. See text.

Recommended mounting hardware torque:

4.34 -

5.79 lbf•ft (6 – 8 kg•cm or 0.588 – 0.784 Nm).

Recommended silicone grease:

Dow Corning SC102, Toshiba YG6260, Shin-Etsu G746., or equivalent

Dwg. EK-003-4A

4

12

5

3

STR-G6651OFF-LINE

QUASI-RESONANT FLYBACK SWITCHING REGULATOR

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

™

Dimensions in Inches

(for reference only)

Dwg. MK-003-5 in

0.110

± 0.008

0.102

± 0.004

Dimensions in Millimeters

(controlling dimensions)

Dwg. MK-003-5 mm

2.8

± 0.2

2.6

± 0.1

STR-G6651

(LF1129)

STR-G6651OFF-LINE QUASI-RESONANT FLYBACK SWITCHING REGULATOR

www.allegromicro.com

Dimensions in Inches

(for reference only)Dimensions in Millimeters

(controlling dimensions)STR-G6651-LF

(LF1128)

STR-G6651OFF-LINE QUASI-RESONANT FLYBACK SWITCHING REGULATOR

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

™The products described here are manufactured in Japan by Sanken Electric Co., Ltd. for sale by Allegro MicroSystems, Inc.Sanken Electric Co., Ltd. and Allegro MicroSystems, Inc.reserve the right to make, from time to time, such departures from the detail specifications as may be required to permit improvements in the performance, reliability, or

manufacturability of their products. Therefore, the user is cautioned to verify that the information in this publication is current before placing any order.

These products are not authorized for use as critical compo-nents in life-support appliances, devices, or systems without express written approval.

The information included herein is believed to be accurate and reliable. However, Sanken Electric Co., Ltd. and Allegro MicroSystems, Inc. assume no responsibility for its use; nor for any infringements of patents or other rights of third parties which may result from its use.