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STR-S6707 THRU STR-S6709 QUASI-RESONANT FLYBACK OFF-LINE SWITCHING REGULATORS STR-S6707 THRU STR-S6709 OFF-LINE SWITCHING REGULATORS – WITH BIPOLAR SWITCHING TRANSISTOR COLLECTOR 1 The STR-S6707, STR-S6708, and STR-S6709 are specifically designed to meet the requirement for increased integration and reliabil- ity in off-line quasi-resonant flyback converters. These devices incorpo- rate the primary control and proportional drive circuit with a third- generation high-voltage bipolar switching transistor. COMMON 2 FAULT BASE 3 Crucial system parameters such as maximum ON time and OFF time are fixed during manufacture. Local control circuit decoupling and layout are optimized within each device. S SINK 4 DRIVE OSC. FAULT LATCH R DRIVE 5 OVER-CURRENT PROTECTION 6 Cycle-by-cycle current limiting, under-voltage lock-out with hyster- esis, over-voltage protection, and thermal shutdown protect these devices during all normal and overload conditions. Over-voltage protection and thermal shutdown are latched after a short delay. A versatile triple-level inhibit circuit includes the OFF time synchronization required to establish quasi-resonant operation. The inhibit function has also been expanded to initiate operation in stand-by mode in which the power supply delivers a small fraction of the steady-state output power. The dual requirements of dielectric isolation and low transient thermal impedance and steady-state thermal resistance are satisfied in an over- molded single-in-line power package. FDBK 7 REF. INHIBIT 8 UVLO V IN 9 Dwg. PK-001 ABSOLUTE MAXIMUM RATINGS Supply Voltage, V IN ........................... 15 V Output Voltage, V CEX ....................... 850 V V EBO ................................................ 7 V Continuous Output Current, I C .......................................... See Table 1 ms Single - Pulse Output Current, I CM ........................................ See Table Sink Current, I S ......................... See Table Drive Current, I D .......................... -700 mA Feedback Current, I FDBK ................. 20 mA Inhibit Voltage, V INH ........................... 15 V Over-Current Protection Voltage Range, V OCP ............................................ Proven in substantial volumes, these devices and their fixed- frequency counterparts represent a significant advance in off-line SMPS reliability growth and integration. FEATURES n Quasi-Resonant Operation for Low EMI and High Efficiency n Output Power to 220 W n Low-Power Output Standby Mode n Pulse-by-Pulse Over-Current Protection n Latched Over-Voltage and Thermal Protection n Third-Generation Switching Transistor with Proportional Drive 3.5 V Insulation Voltage,V WM(RMS) ........... 2000 V Package Power Diss., P D ........ See Graph Output Junction Temperature, T J .. +150 ± n Maximum ON Time and Off Time Set During Manufacture n Internal Under-Voltage Lockout with Hysteresis n Over-Molded SIP with Integral Isolated Heat Spreader ° C Always order by complete part number: Max. Cont. Internal Frame Temperature, T F ... +125 ° C Peak Max. Sink Operating Temperature Range, T A ............................... -20 Part Number Current, I C Current, I CM Current, I S ° ° C to +125 C STR-S6707 6 A 12 A 1.5 A Storage Temperature Range, T stg ............................. -40 STR-S6708 7.5 A 15 A 1.5 A ° ° C to +125 C STR-S6709 10 A 20 A 2 A A TM MicroSystems, Inc. TM STR-S6707 THRU STR-S6709 QUASI-RESONANT FLYBACK OFF-LINE SWITCHING REGULATORS STR-S6707 AND STR-S6708 FUNCTIONAL BLOCK DIAGRAM V IN INHIBIT 9 8 UVLO R OVER-VOLT. PROTECT FAULT LATCH PROPORTIONAL DRIVE S Q 1 k W 5 DRIVE REF. 4 SINK TSD 0.7 W OSC. 3 BASE R ton + 1 COLLECTOR 0.75 V FDBK 7 + 2 COMMON 1.4 V 3300 pF R toff -1 V + 6 OVER-CURRENT PROTECTION + 5.1 V Dwg. FK-001 ALLOWABLE PACKAGE POWER DISSIPATION MAXIMUM SAFE OPERATING AREA 30 60 STR-S6709 (20 A) STR-S6708 (15 A) STR-S6707 (12 A) MOUNTING SURFACE TEMPERATURE 54 W 10 40 RECOMMENDED MAX. FRAME TEMP. = +100 ° C 5.0 3.0 LIMITED BY FRAME TEMP. = +125 ° C MAX. L = 6 mH I B1 = 2.5 A (STR-S6707/08) or 3 A (STR-S6709) I B2 = 0.8 A (STR-SA6707/08) or 1.2 A (STR-S6709) t on = 100 m s dc < 1% 20 1.0 FREE AIR 0.5 3.2 W 0 0.3 20 60 100 140 0 200 400 600 800 1000 TEMPERATURE in ° C COLLECTOR-EMITTER VOLTAGE in VOLTS Dwg. GK-003-2 Dwg. GK-002 A TM 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright © 1994 Allegro MicroSystems, Inc. MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 TM STR-S6707 THRU STR-S6709 QUASI-RESONANT FLYBACK OFF-LINE SWITCHING REGULATORS STR-S6709 FUNCTIONAL BLOCK DIAGRAM AS ABOVE EXCEPT FOR SINK OUTPUT 4 SINK 20 W C, V IN = 8.5 V, voltage measurements are refer- enced to Common (pin 2) (unless otherwise noted). ° Limits Characteristic Symbol Test Conditions Min. Typ. Max. Units On-State Voltage V INT Turn-on, increasing V IN 7.6 8.0 8.4 V Under-Voltage Lockout V INQ Turn-off, decreasing V IN 4.6 4.9 5.2 V Over-Voltage Threshold V OVP(th) 9.2 – 10.7 V Output Leakage Current I CEX V CE = 850 V, V BE = -1.5 V – – 100 m A Output Saturation Voltage V CE(sat) STR-S6707, I C = 2 A, I B = 400 mA – – 400 mV STR-S6708, I C = 3 A, I B = 600 mA – – 400 mV STR-S6709, I C = 4 A, I B = 800 mA – – 400 mV V BE(sat) STR-S6707, I C = 2 A, I B = 400 mA – – 1.5 V STR-S6708, I C = 3 A, I B = 600 mA – – 1.5 V STR-S6709, I C = 4 A, I B = 800 mA – – 1.5 V DC Current Gain h FE V CE = 4 V, I C = 1 A 29 – 61 – Maximum ON Time t on 33 – 41 m s Minimum OFF Time t off 45 – 55 m s Over-Current Threshold V OCP(th) -0.9 -1.0 -1.1 V Feedback Threshold Volt. V FDBK(th) – 650 – mV Inhibit Threshold Voltage V INH(th) Oscillation stops 0.65 0.75 0.85 V Oscillation synchronized – 1.4 2.0 V Oscillation stops (fault latch set) 3.2 5.1 5.6 V Latch Holding Current I INH V IN reduced from 10.7 V to 4 V – – 500 m A Latch Reset Voltage V Q I IN £ 100 m A, V IN reduced from 10.7 V 2.5 3.1 – V Supply Current I IN(ON) Operating 15 – 29 mA I IN(OFF) – – 200 m A Insulation RMS Voltage V WM(RMS) All terminals simultaneous reference 2000 – – V metal plate against backside Thermal Shutdown T J 125 150 – ° C Thermal Resistance R Output junction to mounting surface – 2.0 – ° C/W q JM NOTES: Negative current is defined as coming out of (sourcing) the specified device terminal. Typical Data is for design information only. ELECTRICAL CHARACTERISTICS at T A = +25 STR-S6707 THRU STR-S6709 QUASI-RESONANT FLYBACK OFF-LINE SWITCHING REGULATORS TYPICAL CHARACTERISTICS 100 50 30 V = 4 V CE 10 STR-S6709 STR-S6708 STR-S6707 5.0 3.0 1.0 0.01 0.03 0.1 0.3 1.0 3.0 10 30 100 COLLECTOR CURRENT in AMPERES Dwg. GK-001 A TM MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 TM STR-S6707 THRU STR-S6709 QUASI-RESONANT FLYBACK OFF-LINE SWITCHING REGULATORS TYPICAL QUASI-RESONANT FLYBACK CONVERTER WARNING: lethal potentials are present. See text. + OUTPUT 9 8 R + + S Q 5 VOLTAGE SENSE 4 3 – OUTPUT + 1 + 2 7 + 6 + H Dwg. EK-004A APPLICATIONS INFORMATION 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. Precau- tions 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. Recommended mounting hardware torque: 4.34 – 5.79 lbf•ft (6 – 8 kg•cm or 0.588 – 0.784 Nm). Recommended metal-oxide-filled, alkyl-degenerated oil base, silicone grease: Dow Corning 340, or equivalent [ Pobierz całość w formacie PDF ] |