FSCQ0765RT

FSCQ0765RT FAIRCHILD | Alldatasheet

Document overview

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Technical content

Features

• Optimized for Quasi-Resonant Converter (QRC)
• Advanced Burst-Mode operation for under 1 W standby power consumption
• Pulse by Pulse Current Limit (5A)
• Over load protection (OLP) - Auto restart
• Over voltage protection (OVP) - Auto restart
• Abnormal Over Current Protection (AOCP) - Latch
• Internal Thermal Shutdown (TSD) - Latch
• Under V oltage Lock Out (UVLO) with hysteresis
• Low Startup Current (typical : 25uA)
• Low Operating Current (typical : 4mA)
• Internal High V oltage SenseFET
• Built-in Soft Start (20ms)
• Extended Quasi-resonant Switching for Wide Load Range Application
• C T V
• DVD Receiver
• Audio Power Supply

Description

In general, Quasi-Resonant Converter (QRC) shows lower EMI and higher power conversion efficiency compared to the conventional hard switched converter with a fixed switching frequency. Therefore, it is well suited for applications that are sensitive to the noise, such as color TV and audio. The FSCQ0765RT is an integrated Pulse Width Modulation (PWM) controller and Sense FET specifically designed for Quasi-resonant off-line Switch Mode Power Supplies (SMPS) with minimal external components. The PWM controller includes integrated fixed frequency oscillator, under voltage lockout, leading edge blanking (LEB), optimized gate driver, internal soft start, temperature compensated precise current sources for a loop compensation and self protection circuitry. Compared with discrete MOSFET and PWM controller solution, it can reduce total cost, component count, size and weight simultaneously increasing efficiency, produc- tivity, and system reliability. This device is a basic platform well suited for cost effective designs of Quasi resonant switching flyback converters. Table 1. Notes: 1. Maximum practical continuous power Figure 1. Typical Flyback Application

Figure 2. Functional Block Diagram of FSCQ0765RT

Figure 3. Pin Configuration (Top View) 1 Drain High voltage power SenseFET drain connection. 2 GND This pin is the control ground and the SenseFET source. current for both start-up and steady-state operation. This pin is internally connected to the inverting input of the PWM comparator. 3.0V/1.8V in extended quasi-resonant operation.

(Ta=25°C, unless otherwise specified) Notes: 1. Tj = 25°C to 150°C 2. Repetitive rating: Pulse width limited by maximum junction temperature 3. L = 21mH, V DD = 50V, RG = 25Ω , starting Tj = 25°C Parameter Symbol Value Unit Drain-Source (GND) Voltage (1) VDSS 650 V Drain-Gate Voltage (RGS=1MΩ )V DGR 650 V Gate-Source (GND) Voltage V GS ±30 V Drain Current Pulsed (2) IDM 15 A DC Single Pulsed Avalanche Energy (3) EAS 570 mJ Continuous Drain Current (Tc = 25°C) I D 3.8 A DC Continuous Drain Current (TC=100°C) I D 2.4 A DC Supply Voltage V CC 20 V Analog Input Voltage Range Vsync -0.3 to 13V V VFB -0.3 to VCC V Total Power Dissipation P D 45 W Operating Junction Temperature T J +150 °C Operating Ambient Temperature T A -25 to +85 °C Storage Temperature Range T STG -55 to +150 °C Thermal Resistance Rthjc 2.6 °C/W

Electrical Characteristics (SenseFET Part) (Ta=25°C unless otherwise specified) Note: 1. Pulse test : Pulse width ≤ 300µS, duty ≤ 2% Parameter Symbol Condition Min. Typ. Max. Unit Drain-Source Breakdown Voltage BV DSS VGS = 0V, ID = 250µA 650 - - V Zero Gate Voltage Drain Current I DSS VDS = Max, Rating, VGS = 0V - - 200 µA VDS= 0.8*Max., Rating VGS = 0V, TC = 85°C - - 300 µA Static Drain-source on Resistance (Note) RDS(ON) VGS = 10V, ID = 2.3A - 1.4 1.6 Ω Input Capacitance Ciss VGS = 0V, VDS = 25V, f = 1MHz - 1415 1840 pFOutput Capacitance Coss - 100 130 Reverse Transfer Capacitance Crss - 15 20 Turn on Delay Time td(on) V DD= 0.5BVDSS, ID= 7.0A (MOSFET switching times are essentially independent of operating temperature) -2 5 6 0 ns Rise Time tr - 60 130 Turn Off Delay Time td (off) - 110 230 Fall Time tf - 65 140 Total Gate Charge (Gate-Source+Gate-Drain) Qg V GS = 10V, ID = 7.0A, VDS = 0.5BVDSS (MOSFET Switching times are essentially independent of operating temperature) -4 0 5 2 nCGate-Source Charge Qgs - 7 9.1 Gate-Drain (Miller) Charge Qgd - 12 17

Electrical Characteristics (Continued) (Ta=25°C unless otherwise specified) Note: 1. These parameters is the current flowing in the Control IC. 2. These parameters, although guaranteed, are tested only in EDS (wafer test) process. 3. These parameters indicate Inductor Current. 4. These parameters, although guaranteed at the design, are not tested in mass production. Parameter Symbol Condition Min. Typ. Max. Unit UVLO SECTION Vcc Start Threshold Voltage V START VFB = G N D 1 41 51 6 V Vcc Stop Threshold Voltage V STOP VFB = GND 8 9 10 V SENSEFET SECTION Drain To PKG Breakdown Voltage (Note4) BVpkg 60HZ AC, Ta = 25°C 3500 - - V Drain To Source Breakdown Voltage BVdss Ta = 25°C 650 - - V Drain To Source Leakage Current Idss Vdrain = 400V, Ta = 25°C - - 200 uA OSCILLATOR SECTION Initial Frequency F OSC - 1 82 02 2 k H z Voltage Stability F STABLE 12V ≤ Vcc ≤ 23V 0 1 3 % Temperature Stability (Note2) ∆FOSC -25°C ≤ Ta ≤ 85°C0 ±5± 1 0% Maximum Duty Cycle D MAX - 9 29 59 8% Minimum Duty Cycle D MIN -- - 0 % FEEDBACK SECTION Feedback Source Current I FB VFB = 0.8V 0.5 0.65 0.8 mA Shutdown Feedback Voltage V SD Vfb ≥ 6.9V 7.0 7.5 8.0 V Shutdown Delay Current I DELAY VFB = 5 V 456 µA PROTECTION SECTION Over Voltage Protection V OVP Vsync ≥ 11V 11 12 13 V Over Current Latch Voltage (Note2) V OCL - 0.9 1.0 1.1 V Thermal Shutdown Temp (Note4) T SD - 140 - °C

Electrical Characteristics (Continued) (Ta=25°C unless otherwise specified) Note: 1. These parameters is the current flowing in the Control IC. 2. These parameters, although guaranteed, are tested only in EDS (wafer test) process. 3. These parameters indicate Inductor Current. 4. These parameters, although guaranteed at the design, are not tested in mass production. Parameter Symbol Condition Min. Typ. Max. Unit Sync SECTION Sync Threshold in normal QR (H) V SH1 Vcc = 16V, Vfb = 5V 4.2 4.6 5.0 V Sync Threshold in normal QR (L) V SL1 Vcc = 16V, Vfb = 5V 2.3 2.6 2.9 V Sync Threshold in extended QR (H) V SH2 Vcc = 16V, Vfb = 5V 2.7 3.0 3.3 V Sync Threshold in extended QR (L) V SL2 Vcc = 16V, Vfb = 5V 1.6 1.8 2.0 V Extended QR enable frequency F SYH -9 0-k H z Extended QR disable frequency F SYL -4 5-k H z BURST MODE SECTION Burst Mode Enable Feedback Voltage V BEN 0.25 0.40 0.55 V Burst Mode Feedback Source Current I BFB 60 100 140 uA Burst Mode switching Time T BS VFB = 0V 1.2 1.4 1.6 ms Burst Mode Hold Time T BH VFB = 0V 1.2 1.4 1.6 ms SOFTSTART SECTION Soft start Time (Note2) T SS 18 20 22 ms CURRENT LIMIT(SELF-PROTECTION)SECTION Peak Current Limit (Note3) I LIM - 4.4 5.0 5.6 A Burst Mode Peak Current Limit (Note4) I BPK - 0.65 0.9 1.15 A TOTAL DEVICE SECTION Startup Current I START VCC = VSTART-0.1V - 25 50 uA Sustain Latch Current I SL VCC = VSTOP-0.1V - 50 100 uA Operating Supply Current (Note1) - In normal operation - In burst mode (without switching) I OP Vfb = 2V, VCC = 18V - 4 6 mA IOB Vfb = GND, VCC = 18V - 0.25 0.50 mA

Comparison Between KA5Q0765RT and FSCQ0765RT Function KA5Q0765RT FSCQ0765RT FSCQ0765RT Advantages Startup Current Max. 200uA Max. 50uA Lower standby power consumption Operating supply Current Typ. 10mA Typ. 4mA Operating current is reduced in burst operation to minimize standby power consumption - Normal operation : 4mA - Burst mode with switching : 4mA - Burst mode without switching : 0.25mA Switching in Burst mode Quasi-resonant switching Fixed frequency switching (20kHz) Output regulation in standby mode Vcc control with hysteresis Output voltage feedback control Easy to determine the output voltage in the standby mode Output Voltage drop in burst mode about half Any level Lower power consumption in the standby mode through larger output voltage drop Primary side regulation Available N/A Soft start N/A Available Internal soft-start (20ms) Extended Quasi-resonant switching N/A Available - Guarantees wide load range - Improved efficiency at high line input

Electrical characteristics

-50 0 50 100 150 0.8 1.0 1.2 Temp[ ]℃℃℃℃ Operating Supply Current Normalized to 25℃℃℃℃ -50 0 50 100 150 0.6 0.8 1.0 1.2 1.4 Temp[ ]℃℃℃℃ Burst-mode Supply Current( Non-Switching) Normalized to 25℃℃℃℃ -50 0 50 100 150 0.6 0.8 1.0 1.2 1.4 Temp[ ]℃℃℃℃ Start-Up Current Normalized to 25℃℃℃℃ -50 0 50 100 150 0.90 0.95 1.00 1.05 1.10 Temp[ ]℃℃℃℃ Start Threshold Voltage Normalized to 25℃℃℃℃ -50 0 50 100 150 0.90 0.95 1.00 1.05 1.10 Temp[ ]℃℃℃℃ Stop Threshold Voltage Normalized to 25℃℃℃℃ -50 0 50 100 150 0.90 0.95 1.00 1.05 1.10 Initial Frequency Normalized to 25℃℃℃℃ Temp[ ]℃℃℃℃

-50 0 50 100 150 0.90 0.95 1.00 1.05 1.10 Maximum Duty Cycle Normalized to 25℃℃℃℃ Temp[ ]℃℃℃℃ -50 0 50 100 150 0.90 0.95 1.00 1.05 1.10 Temp[ ]℃℃℃℃ Over Voltage Protection Normalized to 25℃℃℃℃ -50 0 50 100 150 0.8 0.9 1.0 1.1 1.2 Temp[ ]℃℃℃℃ Shutdown Delay Current Normalized to 25℃℃℃℃ -50 0 50 100 150 0.90 0.95 1.00 1.05 1.10 Temp[ ]℃℃℃℃ Shutdown Feedback Voltage Normalized to 25℃℃℃℃ -50 0 50 100 150 0.8 0.9 1.0 1.1 1.2 Temp[ ]℃℃℃℃ Feedback Source Current Normalized to 25℃℃℃℃ -50 0 50 100 150 0.8 0.9 1.0 1.1 1.2 Temp[ ]℃℃℃℃ Burst_mode Feedback Source Current Normalized to 25℃℃℃℃

-50 0 50 100 150 0.6 0.8 1.0 1.2 1.4 Temp[ ]℃℃℃℃ Burst_Mode Enable Feedback Voltage Normalized to 25℃℃℃℃ -50 0 50 100 150 0.6 0.8 1.0 1.2 1.4 Normalized to 25℃℃℃℃ Temp[ ]℃℃℃℃ Feedback Offset Voltage -50 0 50 100 150 0.90 0.95 1.00 1.05 1.10 Temp[ ]℃℃℃℃ Sync. Threshold in Normal QR(H) Normalized to 25℃℃℃℃ -50 0 50 100 150 0.90 0.95 1.00 1.05 1.10 Temp[ ]℃℃℃℃ Sync. Threshold in Normal QR(L) Normalized to 25℃℃℃℃ -50 0 50 100 150 0.90 0.95 1.00 1.05 1.10 Temp[ ]℃℃℃℃ Sync. Threshold in Extended QR(H) Normalized to 25℃℃℃℃ -50 0 50 100 150 0.90 0.95 1.00 1.05 1.10 Temp[ ]℃℃℃℃ Sync. Threshold in Extended QR(L) Normalized to 25℃℃℃℃

switching frequency reaches 45kHz as the load increases. Figure 10. Extended quasi-resonant operation waveforms

1. Feedback Control : FSCQ0765RT employs current mode

typically used to implement the feedback network. or the output load is decreased.

3.1 Pulse-by-pulse current limit : Because current mode

the current through the Sense FET is limited.

3.2 Leading edge blanking (LEB) : At the instant the

LEB) after the Sense FET is turned on. Figure 11. Pulse width modulation (PWM) circuit

1. Protection Circuit : The FSCQ0765RT has several self

the reliability can be improved without increasing cost. voltage of 15V , FSCQ0765RT resumes its normal operation.

4 OSC

Figure 12. Auto restart mode protection

4.1 Over Load Protection (OLP) : Overload is defined as

Figure 13. Over load protection

4.2 Abnormal Over Current Protection (AOCP) : When

Figure 14. When the gate turn-on signal is applied to the Figure 14. AOCP block

4.3 Over voltage Protection (OVP) : If the secondary side

is implemented in auto restart mode.

4.4 Thermal Shutdown (TSD) : The SenseFET and the

1. Soft Start : The FSCQ0765RT has an internal soft start
2. Burst operation : In order to minimize the power

Figure 15. Typical feedback circuit to drop output voltage

1. Before Vo2 drops to Vo2stby, the voltage on the reference

Figure 16. Waveforms of burst operation

Typical application circuit

• High efficiency (>80% at 85Vac input)
• Wider load range through the extended quasi-resonant operation
• Low standby mode power consumption (<1W)
• Low component count
• Enhanced system reliability through various protection functions
• Internal soft-start (20ms) Key Design Notes
• 24V output is designed to drop to around 8V in standby mode 1. Schematic Application Output power Input voltage Output voltage (Max current) C-TV 83W Universal input (85-265Vac) 12V (1A) 18V (0.5A) 125V (0.4A) 24V (0.5A) CCCC111100003333 11110000uuuuFFFF 55550000VVVV 1111 3333 4444 11110000 TTTT1111 EEEEEEEERRRR3333555544440000 11112222VVVV,,,, 1111AAAA CCCC222200004444 1111000000000000uuuuFFFF 33335555VVVV DDDD222200005555 EEEEGGGGPPPP22220000DDDD 11111111 LLLLFFFF111100001111 CCCC111100001111 333333330000nnnnFFFF 222277775555VVVVAAAACCCC FFFFUUUUSSSSEEEE 222255550000VVVV 3333....0000AAAA CCCC111100002222 222222220000uuuuFFFF 444400000000VVVV RRRRTTTT111100001111 5555DDDD----9999 BBBBDDDD111100001111 DDDD111100003333 1111NNNN4444999933337777 RRRR111100003333 5555....1111ΩΩΩΩ 0000....22225555WWWW 6666 7777 RRRR111100004444 1111....5555kkkkΩΩΩΩ 0000....22225555WWWW22224 444 5555 1111 3333 GGGGNNNNDDDD DDDDrrrraaaaiiiinnnn SSSSYYYYNNNNCCCC FFFFBBBB VVVVcccccccc DDDD111100006666 1111NNNN4444111144448888 IIIICCCC111100001111 FFFFSSSSCCCCQQQQ0000777766665555RRRRTTTT CCCC111100006666 44447777nnnnFFFF 55550000VVVV RRRR111100005555 444477770000ΩΩΩΩ 0000....22225555WWWW CCCC111100005555 3333....9999nnnnFFFF 55550000VVVV ZZZZDDDD111100002222 11118888VVVV 1111WWWW CCCC111100007777 1111nnnnFFFF 1111kkkkVVVV BBBBEEEEAAAADDDD111100001111 DDDD111100005555 1111NNNN4444999933337777 CCCC222211110000 444477770000ppppFFFF 1111kkkkVVVV 11118888VVVV,,,, 0000....5555AAAA DDDD222200004444 EEEEGGGGPPPP22220000DDDD CCCC222200005555 1111000000000000uuuuFFFF 33335555VVVV 11113333 CCCC222200009999 444477770000ppppFFFF 1111kkkkVVVV11112222 111122225555VVVV,,,, 0000....4444AAAA DDDD222200002222 EEEEGGGGPPPP22220000JJJJ CCCC222200001111 111100000000uuuuFFFF 111166660000VVVV 11114444 CCCC222200007777 444477770000ppppFFFF 1111kkkkVVVV LLLL222200002222 BBBBEEEEAAAADDDD 11116666 CCCC222200002222 44447777uuuuFFFF 111166660000VVVV 22224444VVVV,,,, 0000....5555AAAA DDDD222200003333 EEEEGGGGPPPP22220000DDDD CCCC222200003333 1111000000000000uuuuFFFF 33335555VVVV 11117777 CCCC222200008888 444477770000ppppFFFF 1111kkkkVVVV11118888 OOOOPPPPTTTTOOOO111100001111 888811117777AAAA RRRR222200001111 1111kkkkΩΩΩΩ 0000....22225555WWWW CCCC222200006666 111155550000nnnnFFFF 55550000VVVV CCCC333300001111 2222....2222nnnnFFFF QQQQ222200001111 KKKKAAAA444433331111 LLLLZZZZ RRRR222200003333 33339999kkkkΩΩΩΩ 0000....22225555WWWW RRRR222200002222 1111kkkkΩΩΩΩ 0000....22225555WWWW RRRR222200005555 222222220000kkkkΩΩΩΩ 0000....22225555WWWW RRRR222200004444 4444....7777kkkkΩΩΩΩ 0000....22225555WWWW VVVVRRRR222200001111 33330000kkkkΩΩΩΩ DDDD222200001111 1111NNNN4444111144448888 QQQQ222200002222 KKKKSSSSCCCC999944445555 RRRR222200006666 11110000kkkkΩΩΩΩ 0000....22225555WWWW RRRR222200007777 5555....1111kkkkΩΩΩΩ 0000....22225555WWWW SSSSWWWW222200001111 11115555 RRRR111100002222 111155550000kkkkΩΩΩΩ 0000....22225555WWWWRRRR111100001111 111100000000kkkkΩΩΩΩ 0000....22225555WWWW RRRR111100006666 1111kkkkΩΩΩΩ 1111WWWW CCCC111100004444 11110000uuuuFFFF 55550000VVVV ZZZZDDDD222200001111 5555....1111VVVV 0000....5555WWWW RRRR222200008888 1111kkkkΩΩΩΩ 0000....22225555WWWW

1. Transformer Schematic Diagram 3.Winding Specification 4.Electrical Characteristics 5. Core & Bobbin Core : EER 3540 Bobbin : EER3540 Ae : 107 mm No Pin (s → f) Wire Turns Winding Method Np1 1 - 3 0.5 φ × 1 32 Center Winding N125V/2 16 - 15 0.5 φ × 1 32 Center Winding N24V 18 - 17 0.4 φ × 2 13 Center Winding N12V 12 - 13 0.5 φ × 2 7 Center Winding Np2 3 - 4 0.5 φ × 1 32 Center Winding N125V/2 15 - 14 0.5 φ × 1 32 Center Winding N18V 11 - 10 0.4 φ × 2 10 Center Winding Na 7 - 6 0.3 φ × 1 20 Center Winding Pin Specification Remarks Inductance 1 - 3 515uH ± 5% 1kHz, 1V Leakage Inductance 1 - 3 10uH Max 2 nd all short EER3540 N24V N a N125V /2 N12V N18V Np1 Np2 91 0 N125V /2 N125V/2 Np2 N12V N125V/2 N24V Np1 N18V Na

6.Demo Circuit Part List Part Value Note Part Value Note Fuse C210 470pF / 1kV Ceramic Capacitor FUSE 250V / 3A C301 3.3nF / 1kV AC Ceramic Capacitor NTC Inductor RT101 5D-9 BEAD101 BEAD Resistor BEAD201 5uH 3A R101 100k Ω 0.25 W Diode R102 150k Ω 0.25 W D101 1N4937 1A, 600V R103 5.1 Ω 0.25 W D102 1N4937 1A, 600V R104 1.5k Ω 0.25 W D103 1N4148 0.15A, 50V R105 470 Ω 0.25 W D104 Short R106 1k Ω 1 W D105 Open R107 Open ZD101 1N5246 18V, 1W R201 1k Ω 0.25 W ZD102 Open R202 1k Ω 0.25 W ZD201 1N5231 5.1V, 0.5W R203 39k Ω 0.25 W D201 1N4148 0.15A, 50V R204 4.7k Ω 0.25 W , 1% D202 EGP20J 2A, 600V R205 220k Ω 0.25 W , 1% D203 EGP20D 2A, 200V R206 10k Ω 0.25 W D204 EGP20D 2A, 200V R207 5.1k Ω 0.25 W D205 EGP20D 2A, 200V R208 1k Ω 0.25 W VR201 30k Ω Bridge Diode Capacitor BD101 GSIB660 6A, 600V C101 330n/275VAC Box Capacitor Line Filter C102 220uF / 400V Electrolytic LF101 14mH C103 10uF / 50V Electrolytic Transformer C104 10uF / 50V Electrolytic T101 EER3540 C105 3.9nF / 50V Film Capacitor Switch C106 47nF / 50V Film Capacitor SW201 ON/OFF For MCU Signal C107 1nF / 1kV Film Capacitor IC C108 Open IC101 FSCQ0765RT TO220F-5L C201 100uF / 160V Electrolytic OPT101 817A C202 47uF / 160V Electrolytic Q201 KA431LZ TO-92 C203 1000uF / 35V Electrolytic Q202 KSC945 C204 1000uF / 35V Electrolytic C205 1000uF / 35V Electrolytic C206 150nF / 50V Film Capacitor C207 470pF / 1kV Ceramic Capacitor C208 470pF / 1kV Ceramic Capacitor C209 470pF / 1kV Ceramic Capacitor

TO-220F-5L(Forming)

Ordering Information

YDTU : Forming Type Product Number Package Marking Code BVdss R ds(ON) Max. FSCQ0765RTYDTU TO-220F-5L(Forming) CQ0765RT 650V 1.6 Ω

7/7/04 0.0m 001  2004 Fairchild Semiconductor Corporation LIFE SUPPORT POLICY FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. 2. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.